Askar 71F Quadruplet APO Refractor Telescope
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Please note: Askar no longer includes a free diagonal and eyepieces with this telescope as they originally did.
- Beginner-friendly, full-frame-ready astrograph at an approachable price
- 71mm aperture, 490mm focal length at f/6.9 focal ratio
- Four-element APO design with one ED glass element
- Built-in field flattener means no precise backfocus spacing to dial in
- Sharp performance across full-frame sensors
- Compact, lightweight design for easier mount pairing and portability
- Optional 0.75× reducer for 368mm f/5.2 wide-field imaging
Beginner-Friendly, Advanced Performance: Meet the Askar 71F!
The Askar 71F brings together three things that rarely come in the same telescope:
- Beginner-friendly, highly compatible design
- Full-frame-ready optical performance
- Affordable and accessible price point
That rare combination is exactly why the Askar 71F earned a spot on our Best Telescopes of 2026 list. It’s an astrograph that’s genuinely easy to recommend to a beginner, without feeling like a telescope you'll quickly outgrow.
Its four-element flat-field design delivers sharp stars across the image—even with a full-frame camera—without a separate field flattener or precise flattener spacing. At 490mm, f/6.9, and just 5.5 lb, it’s a versatile, forgiving astrograph that can form the heart of a compact imaging setup for years to come.
Watch a Quick Overview of the Askar 71F
Check out our overview of the Askar 71F! We take a closer look at its flat-field quadruplet optics, full-frame-ready performance, compact design, optional reducer, and what makes it such a versatile choice for deep-sky astrophotography:
“This was my 4th refractor. I wish it were my first.”
This is the best value in Astro. Flat field, perfect stars, lightweight, great build quality, excellent focuser. This scope is just awesome.
Real Images Captured with the Askar 71F
Credit: Sandwall
Gear: 71F & ZWO ASI2600MC
Credit: Nerci Flückiger
Gear: 71F & ZWO ASI2600MC
Credit: Ákos TakácsAskar
Gear: 71F & ZWO ASI533MC Pro
Full Frame Ready
The 44mm image circle supports full-frame cameras, leaving room for your setup to grow. Including the optional 0.75x reducer will still maintain the 44mm full-frame coverage.
Expand The Field of View
Add the 0.75x reducer (sold separately) to shorten the 71F from 490mm f/6.9 to 369mm f/5.2 for wider, faster imaging of large deep-sky targets.
Versatile 490mm Focal Length
The Askar 71F includes everything you need for imaging. It comes with M64 to M54, M54 to M54, and M54 to M48 adapters, each with built-in filter threads.
Flexible Mounting Options
Askar includes a multifunction handle with slots for accessories like a guidescope or an ASIAIR controller, plus two finder bases so you can attach more add-ons. A built-in 360° rotator makes it easy to frame your targets.
Flat-Field Optical Design
See sharp stars across the frame with this four-element optical design, including one ED glass element. Its built-in field correction eliminates the need for precise back-focus spacing at the native focal length.
Dial In Precise Focus
The Askar 71F features a dual-speed 2.4" focuser with 10:1 fine adjustment, giving you the control to dial in sharp focus. The fine-focus knob is especially useful for astrophotography, where even small focus changes can make a noticeable difference in star sharpness, and the focuser is also compatible with popular electronic focusers for automated focusing.
Wide Autofocuser Compatibility
The Askar 71F's focuser design is compatible with a variety of electronic autofocusers, including the ZWO EAF, ToupTek Auto Focuser, and many more.
Factory Certified & Quality Checked
Every Askar 71F is factory-certified before it leaves Sharpstar’s facility. Each telescope goes through mechanical and optical quality control checks, and a signed inspection checklist is included in the box.
At Agena, we don’t open and re-test the optics, but if you’d like an extra round of cosmetic and mechanical inspection before your scope ships, just let us know in the order comments. We’re happy to do this at no cost, though it may add 1–2 business days to your shipping time.
Specifications
- Aperture: 71mm
- Focal length: 490mm
- Focal ratio: f/6.9
- Objective lens: Air-spaced quadruplet APO with one ED glass element
- Image circle: 44mm
- OTA weight: 5.5 lbs (2.5 kg)
- Weight with accessories: 6.6 lbs (3.0 kg)
Rear Thread Options
- M64x0.75 to M54x0.75
- M54x0.75 to M54x0.75
- M54x0.75 to M48x0.75, with M48x0.75 filter thread
Maximum Back Focus
With focuser fully retracted
- 82.5mm from the base of the M48x0.75 male thread
- 100.5mm from the base of the M54x0.75 male thread
Total Length
- 372.5mm with 1.25 in adapter and dew shield retracted
- 430.9mm with 1.25 in adapter and dew shield fully extended
- 415mm with photographic adapter and dew shield retracted
- 473.4mm with photographic adapter and dew shield fully extended
Askar 71F Mechanical Diagrams
Optical Configurations
Adapters and Back Focus
Focuser & Underside Dimensions
Labeled Components
Frequently Asked Questions
What type of telescope is the Askar 71F?
The Askar 71F is an apochromatic quadruplet refractor. It uses four high-quality lenses to deliver sharp, flat images with minimal color fringing, perfect for astrophotography.
Is the Askar 71F suitable for beginners?
Yes! Its lightweight design, easy setup, and high-quality optics make it ideal for both beginner and experienced astrophotographers.
What are the size, weight, and portability of the Askar 71F?
The telescope has a 71mm (2.8") aperture, a 490mm focal length, and weighs about 2.4 kg (5.3 lbs). Its compact size makes it easy to carry, mount, and transport for backyard or remote observing.
What objects can I photograph with the Askar 71F?
You can photograph nebulae, galaxies, star clusters, the Moon, and more with the 71F. It’s especially great for wide-field astrophotography targets like the Andromeda Galaxy, Orion Nebula, and dense star fields.
What exposure times are recommended for astrophotography with the Askar 71F?
Exposure times vary by camera, mount, and sky conditions. Beginners often start with 30-second to 3-minute exposures, stacking multiple images for best results.
How sharp are stars at the edges, and does it show color fringing?
Stars remain tight and round across the field, even at the edges. The apochromatic quadruplet lens system minimizes chromatic aberration, keeping colors accurate and images distortion-free.
How does the Askar 71F compare to other small refractors?
It stands out for its flat-field optics, portability, and versatility. Compared to other doublets, it delivers sharper, distortion-free images across full-frame sensors, making it a strong choice for both beginners and advanced users.
Which cameras and sensors are compatible with the Askar 71F for astrophotography?
The 71F works with DSLR, mirrorless, and dedicated astronomy cameras, including full-frame and smaller sensors. Its flat-field optics reduce distortion and star stretching for wide-field imaging.
Do I need extra accessories like field flatteners or focal reducers for astrophotography?
The quadruplet design produces flat, sharp images without a separate field flattener. A focal reducer is optional if you want a wider field of view.
How easy is it to set up the Askar 71F, and what mounts work best?
Setup is quick thanks to its simple optical layout. For astrophotography, a motorized equatorial mount is recommended.
Can the Askar 71F be used for visual observing and daytime spotting?
Yes. While optimized for astrophotography, it can be used visually when paired with an optional diagonal/prism and eyepiece (sold separately). It provides bright, high-contrast views for visual observing and can double as a daytime spotting scope for terrestrial objects.
Does the Askar 71F come with an eyepiece and diagonal for visual observing?
The Askar 71F was previously sold with an eyepiece and diagonal, but current versions no longer include them as the 71F is primarily used for astrophotography. It can still be used for visual observing with a compatible diagonal and eyepiece purchased separately.
What maintenance is required, and can it handle different weather conditions?
Maintenance is minimal. Keep lenses clean and covered when not in use, and avoid touching them with fingers. It can handle cold or damp conditions but should acclimate to outdoor temperatures and be stored in a dry place to prevent condensation.
Other Information
- Country of Manufacture: China
Beginner-Friendly, Advanced Performance: Meet the Askar 71F!
The Askar 71F brings together three things that rarely come in the same telescope:
- Beginner-friendly, highly compatible design
- Full-frame-ready optical performance
- Affordable and accessible price point
That rare combination is exactly why the Askar 71F earned a spot on our Best Telescopes of 2026 list. It’s an astrograph that’s genuinely easy to recommend to a beginner, without feeling like a telescope you'll quickly outgrow.
Its four-element flat-field design delivers sharp stars across the image—even with a full-frame camera—without a separate field flattener or precise flattener spacing. At 490mm, f/6.9, and just 5.5 lb, it’s a versatile, forgiving astrograph that can form the heart of a compact imaging setup for years to come.
Watch a Quick Overview of the Askar 71F
Check out our overview of the Askar 71F! We take a closer look at its flat-field quadruplet optics, full-frame-ready performance, compact design, optional reducer, and what makes it such a versatile choice for deep-sky astrophotography:
“This was my 4th refractor. I wish it were my first.”
This is the best value in Astro. Flat field, perfect stars, lightweight, great build quality, excellent focuser. This scope is just awesome.
Real Images Captured with the Askar 71F
Credit: Sandwall
Gear: 71F & ZWO ASI2600MC
Credit: Nerci Flückiger
Gear: 71F & ZWO ASI2600MC
Credit: Ákos TakácsAskar
Gear: 71F & ZWO ASI533MC Pro
Full Frame Ready
The 44mm image circle supports full-frame cameras, leaving room for your setup to grow. Including the optional 0.75x reducer will still maintain the 44mm full-frame coverage.
Expand The Field of View
Add the 0.75x reducer (sold separately) to shorten the 71F from 490mm f/6.9 to 369mm f/5.2 for wider, faster imaging of large deep-sky targets.
Versatile 490mm Focal Length
The Askar 71F includes everything you need for imaging. It comes with M64 to M54, M54 to M54, and M54 to M48 adapters, each with built-in filter threads.
Flexible Mounting Options
Askar includes a multifunction handle with slots for accessories like a guidescope or an ASIAIR controller, plus two finder bases so you can attach more add-ons. A built-in 360° rotator makes it easy to frame your targets.
Flat-Field Optical Design
See sharp stars across the frame with this four-element optical design, including one ED glass element. Its built-in field correction eliminates the need for precise back-focus spacing at the native focal length.
Dial In Precise Focus
The Askar 71F features a dual-speed 2.4" focuser with 10:1 fine adjustment, giving you the control to dial in sharp focus. The fine-focus knob is especially useful for astrophotography, where even small focus changes can make a noticeable difference in star sharpness, and the focuser is also compatible with popular electronic focusers for automated focusing.
Wide Autofocuser Compatibility
The Askar 71F's focuser design is compatible with a variety of electronic autofocusers, including the ZWO EAF, ToupTek Auto Focuser, and many more.
Factory Certified & Quality Checked
Every Askar 71F is factory-certified before it leaves Sharpstar’s facility. Each telescope goes through mechanical and optical quality control checks, and a signed inspection checklist is included in the box.
At Agena, we don’t open and re-test the optics, but if you’d like an extra round of cosmetic and mechanical inspection before your scope ships, just let us know in the order comments. We’re happy to do this at no cost, though it may add 1–2 business days to your shipping time.
Specifications
- Aperture: 71mm
- Focal length: 490mm
- Focal ratio: f/6.9
- Objective lens: Air-spaced quadruplet APO with one ED glass element
- Image circle: 44mm
- OTA weight: 5.5 lbs (2.5 kg)
- Weight with accessories: 6.6 lbs (3.0 kg)
Rear Thread Options
- M64x0.75 to M54x0.75
- M54x0.75 to M54x0.75
- M54x0.75 to M48x0.75, with M48x0.75 filter thread
Maximum Back Focus
With focuser fully retracted
- 82.5mm from the base of the M48x0.75 male thread
- 100.5mm from the base of the M54x0.75 male thread
Total Length
- 372.5mm with 1.25 in adapter and dew shield retracted
- 430.9mm with 1.25 in adapter and dew shield fully extended
- 415mm with photographic adapter and dew shield retracted
- 473.4mm with photographic adapter and dew shield fully extended
Askar 71F Mechanical Diagrams
Optical Configurations
Adapters and Back Focus
Focuser & Underside Dimensions
Labeled Components
Frequently Asked Questions
What type of telescope is the Askar 71F?
The Askar 71F is an apochromatic quadruplet refractor. It uses four high-quality lenses to deliver sharp, flat images with minimal color fringing, perfect for astrophotography.
Is the Askar 71F suitable for beginners?
Yes! Its lightweight design, easy setup, and high-quality optics make it ideal for both beginner and experienced astrophotographers.
What are the size, weight, and portability of the Askar 71F?
The telescope has a 71mm (2.8") aperture, a 490mm focal length, and weighs about 2.4 kg (5.3 lbs). Its compact size makes it easy to carry, mount, and transport for backyard or remote observing.
What objects can I photograph with the Askar 71F?
You can photograph nebulae, galaxies, star clusters, the Moon, and more with the 71F. It’s especially great for wide-field astrophotography targets like the Andromeda Galaxy, Orion Nebula, and dense star fields.
What exposure times are recommended for astrophotography with the Askar 71F?
Exposure times vary by camera, mount, and sky conditions. Beginners often start with 30-second to 3-minute exposures, stacking multiple images for best results.
How sharp are stars at the edges, and does it show color fringing?
Stars remain tight and round across the field, even at the edges. The apochromatic quadruplet lens system minimizes chromatic aberration, keeping colors accurate and images distortion-free.
How does the Askar 71F compare to other small refractors?
It stands out for its flat-field optics, portability, and versatility. Compared to other doublets, it delivers sharper, distortion-free images across full-frame sensors, making it a strong choice for both beginners and advanced users.
Which cameras and sensors are compatible with the Askar 71F for astrophotography?
The 71F works with DSLR, mirrorless, and dedicated astronomy cameras, including full-frame and smaller sensors. Its flat-field optics reduce distortion and star stretching for wide-field imaging.
Do I need extra accessories like field flatteners or focal reducers for astrophotography?
The quadruplet design produces flat, sharp images without a separate field flattener. A focal reducer is optional if you want a wider field of view.
How easy is it to set up the Askar 71F, and what mounts work best?
Setup is quick thanks to its simple optical layout. For astrophotography, a motorized equatorial mount is recommended.
Can the Askar 71F be used for visual observing and daytime spotting?
Yes. While optimized for astrophotography, it can be used visually when paired with an optional diagonal/prism and eyepiece (sold separately). It provides bright, high-contrast views for visual observing and can double as a daytime spotting scope for terrestrial objects.
Does the Askar 71F come with an eyepiece and diagonal for visual observing?
The Askar 71F was previously sold with an eyepiece and diagonal, but current versions no longer include them as the 71F is primarily used for astrophotography. It can still be used for visual observing with a compatible diagonal and eyepiece purchased separately.
What maintenance is required, and can it handle different weather conditions?
Maintenance is minimal. Keep lenses clean and covered when not in use, and avoid touching them with fingers. It can handle cold or damp conditions but should acclimate to outdoor temperatures and be stored in a dry place to prevent condensation.
| Manufacturer | Askar |
|---|---|
| Telescope Focal Length | 601 - 700mm |
- 1x Askar 71F OTA
- 1x Lens cap
- 1x Pair of tube rings
- 1x Multifunctional handlebar
- 1x Askar 230mm Vixen-style dovetail plate
- 1x 2" to 1.25" adapter
- 1x M64 to 2" adapter
- 1x Set of M64–M54 and M54–M48 photographic adapters
- 1x Inspection checklist
- 1x Product card
- 1x User manual
- 1x Certificate card
Please note: Askar no longer includes a free diagonal and eyepieces with this telescope as they originally did.
- Beginner-friendly, full-frame-ready astrograph at an approachable price
- 71mm aperture, 490mm focal length at f/6.9 focal ratio
- Four-element APO design with one ED glass element
- Built-in field flattener means no precise backfocus spacing to dial in
- Sharp performance across full-frame sensors
- Compact, lightweight design for easier mount pairing and portability
- Optional 0.75× reducer for 368mm f/5.2 wide-field imaging
Beginner-Friendly, Advanced Performance: Meet the Askar 71F!
The Askar 71F brings together three things that rarely come in the same telescope:
- Beginner-friendly, highly compatible design
- Full-frame-ready optical performance
- Affordable and accessible price point
That rare combination is exactly why the Askar 71F earned a spot on our Best Telescopes of 2026 list. It’s an astrograph that’s genuinely easy to recommend to a beginner, without feeling like a telescope you'll quickly outgrow.
Its four-element flat-field design delivers sharp stars across the image—even with a full-frame camera—without a separate field flattener or precise flattener spacing. At 490mm, f/6.9, and just 5.5 lb, it’s a versatile, forgiving astrograph that can form the heart of a compact imaging setup for years to come.
Watch a Quick Overview of the Askar 71F
Check out our overview of the Askar 71F! We take a closer look at its flat-field quadruplet optics, full-frame-ready performance, compact design, optional reducer, and what makes it such a versatile choice for deep-sky astrophotography:
“This was my 4th refractor. I wish it were my first.”
This is the best value in Astro. Flat field, perfect stars, lightweight, great build quality, excellent focuser. This scope is just awesome.
Real Images Captured with the Askar 71F
Credit: Sandwall
Gear: 71F & ZWO ASI2600MC
Credit: Nerci Flückiger
Gear: 71F & ZWO ASI2600MC
Credit: Ákos TakácsAskar
Gear: 71F & ZWO ASI533MC Pro
Full Frame Ready
The 44mm image circle supports full-frame cameras, leaving room for your setup to grow. Including the optional 0.75x reducer will still maintain the 44mm full-frame coverage.
Expand The Field of View
Add the 0.75x reducer (sold separately) to shorten the 71F from 490mm f/6.9 to 369mm f/5.2 for wider, faster imaging of large deep-sky targets.
Versatile 490mm Focal Length
The Askar 71F includes everything you need for imaging. It comes with M64 to M54, M54 to M54, and M54 to M48 adapters, each with built-in filter threads.
Flexible Mounting Options
Askar includes a multifunction handle with slots for accessories like a guidescope or an ASIAIR controller, plus two finder bases so you can attach more add-ons. A built-in 360° rotator makes it easy to frame your targets.
Flat-Field Optical Design
See sharp stars across the frame with this four-element optical design, including one ED glass element. Its built-in field correction eliminates the need for precise back-focus spacing at the native focal length.
Dial In Precise Focus
The Askar 71F features a dual-speed 2.4" focuser with 10:1 fine adjustment, giving you the control to dial in sharp focus. The fine-focus knob is especially useful for astrophotography, where even small focus changes can make a noticeable difference in star sharpness, and the focuser is also compatible with popular electronic focusers for automated focusing.
Wide Autofocuser Compatibility
The Askar 71F's focuser design is compatible with a variety of electronic autofocusers, including the ZWO EAF, ToupTek Auto Focuser, and many more.
Factory Certified & Quality Checked
Every Askar 71F is factory-certified before it leaves Sharpstar’s facility. Each telescope goes through mechanical and optical quality control checks, and a signed inspection checklist is included in the box.
At Agena, we don’t open and re-test the optics, but if you’d like an extra round of cosmetic and mechanical inspection before your scope ships, just let us know in the order comments. We’re happy to do this at no cost, though it may add 1–2 business days to your shipping time.
Specifications
- Aperture: 71mm
- Focal length: 490mm
- Focal ratio: f/6.9
- Objective lens: Air-spaced quadruplet APO with one ED glass element
- Image circle: 44mm
- OTA weight: 5.5 lbs (2.5 kg)
- Weight with accessories: 6.6 lbs (3.0 kg)
Rear Thread Options
- M64x0.75 to M54x0.75
- M54x0.75 to M54x0.75
- M54x0.75 to M48x0.75, with M48x0.75 filter thread
Maximum Back Focus
With focuser fully retracted
- 82.5mm from the base of the M48x0.75 male thread
- 100.5mm from the base of the M54x0.75 male thread
Total Length
- 372.5mm with 1.25 in adapter and dew shield retracted
- 430.9mm with 1.25 in adapter and dew shield fully extended
- 415mm with photographic adapter and dew shield retracted
- 473.4mm with photographic adapter and dew shield fully extended
Askar 71F Mechanical Diagrams
Optical Configurations
Adapters and Back Focus
Focuser & Underside Dimensions
Labeled Components
Frequently Asked Questions
What type of telescope is the Askar 71F?
The Askar 71F is an apochromatic quadruplet refractor. It uses four high-quality lenses to deliver sharp, flat images with minimal color fringing, perfect for astrophotography.
Is the Askar 71F suitable for beginners?
Yes! Its lightweight design, easy setup, and high-quality optics make it ideal for both beginner and experienced astrophotographers.
What are the size, weight, and portability of the Askar 71F?
The telescope has a 71mm (2.8") aperture, a 490mm focal length, and weighs about 2.4 kg (5.3 lbs). Its compact size makes it easy to carry, mount, and transport for backyard or remote observing.
What objects can I photograph with the Askar 71F?
You can photograph nebulae, galaxies, star clusters, the Moon, and more with the 71F. It’s especially great for wide-field astrophotography targets like the Andromeda Galaxy, Orion Nebula, and dense star fields.
What exposure times are recommended for astrophotography with the Askar 71F?
Exposure times vary by camera, mount, and sky conditions. Beginners often start with 30-second to 3-minute exposures, stacking multiple images for best results.
How sharp are stars at the edges, and does it show color fringing?
Stars remain tight and round across the field, even at the edges. The apochromatic quadruplet lens system minimizes chromatic aberration, keeping colors accurate and images distortion-free.
How does the Askar 71F compare to other small refractors?
It stands out for its flat-field optics, portability, and versatility. Compared to other doublets, it delivers sharper, distortion-free images across full-frame sensors, making it a strong choice for both beginners and advanced users.
Which cameras and sensors are compatible with the Askar 71F for astrophotography?
The 71F works with DSLR, mirrorless, and dedicated astronomy cameras, including full-frame and smaller sensors. Its flat-field optics reduce distortion and star stretching for wide-field imaging.
Do I need extra accessories like field flatteners or focal reducers for astrophotography?
The quadruplet design produces flat, sharp images without a separate field flattener. A focal reducer is optional if you want a wider field of view.
How easy is it to set up the Askar 71F, and what mounts work best?
Setup is quick thanks to its simple optical layout. For astrophotography, a motorized equatorial mount is recommended.
Can the Askar 71F be used for visual observing and daytime spotting?
Yes. While optimized for astrophotography, it can be used visually when paired with an optional diagonal/prism and eyepiece (sold separately). It provides bright, high-contrast views for visual observing and can double as a daytime spotting scope for terrestrial objects.
Does the Askar 71F come with an eyepiece and diagonal for visual observing?
The Askar 71F was previously sold with an eyepiece and diagonal, but current versions no longer include them as the 71F is primarily used for astrophotography. It can still be used for visual observing with a compatible diagonal and eyepiece purchased separately.
What maintenance is required, and can it handle different weather conditions?
Maintenance is minimal. Keep lenses clean and covered when not in use, and avoid touching them with fingers. It can handle cold or damp conditions but should acclimate to outdoor temperatures and be stored in a dry place to prevent condensation.
Other Information
- Country of Manufacture: China
| Manufacturer | Askar |
|---|---|
| Telescope Focal Length | 601 - 700mm |
- 1x Askar 71F OTA
- 1x Lens cap
- 1x Pair of tube rings
- 1x Multifunctional handlebar
- 1x Askar 230mm Vixen-style dovetail plate
- 1x 2" to 1.25" adapter
- 1x M64 to 2" adapter
- 1x Set of M64–M54 and M54–M48 photographic adapters
- 1x Inspection checklist
- 1x Product card
- 1x User manual
- 1x Certificate card
Askar 71F Quadruplet APO Refractor Telescope