Explore Scientific 2" Field Flattener with M42 T Thread: For f/5 to f/7 Refractors
- This item is out of stock.
- Sign up for back-in-stock alerts to be notified when this item becomes available (account login required).
Stock count is accurate & shown in real time.
- This item is out of stock.
- Sign up for back-in-stock alerts to be notified when this item becomes available (account login required).
- This item is out of stock.
- Sign up for back-in-stock alerts to be notified when this item becomes available (account login required).
Contiguous US / Lower 48:
Free shipping applies to orders over $50 using our chosen carrier/method. Faster paid options are available at checkout.
Alaska, Hawaii & US Territories:
Free shipping applies to many—but not all—products. Enter your ZIP code in cart or upon checkout to confirm options and costs.
International:
International orders do not qualify for free shipping. Shipping, duties, brokerage, tariffs, and taxes are the customer’s responsibility. Some items may be restricted due to export, size, or manufacturer limitations.
- This is a field flattener for refractor-type telescopes with a focal ratio of f/5 to f/7
- Causes no change to the telescope focal length
- 2-inch barrel to easily slide into a two-inch focuser
- Fully multi-coated optics
- 42mm T-ring thread on the device so a T-ring can be used to easily attach a DSLR camera or a dedicated astrocamera
- 38 mm of clear aperture
- Requires 55mm (+/-2) of back focus/spacing between the device and the camera sensor
- Premium high glossy anodizing finish
When doing astrophotography with refractor-type telescopes, the faster the focal ratio the more field curvature becomes a problem. Field curvature will appear in the corners of astrophotographs, making the stars smear perpendicular to the axis of the image. This is called coma -- coma is Latin for comet, because the stars look like comets. The more the curvature, the closer to the center the coma appears. The larger the sensor, the worse the coma.
Astrophotographers can easily correct the coma by using a field flattener – an optical device that goes between the telescope and the camera. Field fatteners are not interchangeable, because these devices are designed to work with a small range of focal ratios.
The Explore Scientific field flattener is designed to work with telescopes with focal ratios between f/5 and f/7. Our device requires 55 mm (+/-2 mm) of spacing between the back of the device and the camera sensor.
NOTE: This device is for photographic use only. It is NOT intended for visual use.
Fits the following Explore Scientific telescopes:
- DAR1020765-01/02
- DAR127065-02
- DAR152065-01/02
- ES-ED0806-02
- ES-ED10207-02
- FCD100-0806-01/02
- FCD100-10207-02
Other Information
- Country of Manufacture: Taiwan
When doing astrophotography with refractor-type telescopes, the faster the focal ratio the more field curvature becomes a problem. Field curvature will appear in the corners of astrophotographs, making the stars smear perpendicular to the axis of the image. This is called coma -- coma is Latin for comet, because the stars look like comets. The more the curvature, the closer to the center the coma appears. The larger the sensor, the worse the coma.
Astrophotographers can easily correct the coma by using a field flattener – an optical device that goes between the telescope and the camera. Field fatteners are not interchangeable, because these devices are designed to work with a small range of focal ratios.
The Explore Scientific field flattener is designed to work with telescopes with focal ratios between f/5 and f/7. Our device requires 55 mm (+/-2 mm) of spacing between the back of the device and the camera sensor.
NOTE: This device is for photographic use only. It is NOT intended for visual use.
Fits the following Explore Scientific telescopes:
- DAR1020765-01/02
- DAR127065-02
- DAR152065-01/02
- ES-ED0806-02
- ES-ED10207-02
- FCD100-0806-01/02
- FCD100-10207-02
- This is a field flattener for refractor-type telescopes with a focal ratio of f/5 to f/7
- Causes no change to the telescope focal length
- 2-inch barrel to easily slide into a two-inch focuser
- Fully multi-coated optics
- 42mm T-ring thread on the device so a T-ring can be used to easily attach a DSLR camera or a dedicated astrocamera
- 38 mm of clear aperture
- Requires 55mm (+/-2) of back focus/spacing between the device and the camera sensor
- Premium high glossy anodizing finish
When doing astrophotography with refractor-type telescopes, the faster the focal ratio the more field curvature becomes a problem. Field curvature will appear in the corners of astrophotographs, making the stars smear perpendicular to the axis of the image. This is called coma -- coma is Latin for comet, because the stars look like comets. The more the curvature, the closer to the center the coma appears. The larger the sensor, the worse the coma.
Astrophotographers can easily correct the coma by using a field flattener – an optical device that goes between the telescope and the camera. Field fatteners are not interchangeable, because these devices are designed to work with a small range of focal ratios.
The Explore Scientific field flattener is designed to work with telescopes with focal ratios between f/5 and f/7. Our device requires 55 mm (+/-2 mm) of spacing between the back of the device and the camera sensor.
NOTE: This device is for photographic use only. It is NOT intended for visual use.
Fits the following Explore Scientific telescopes:
- DAR1020765-01/02
- DAR127065-02
- DAR152065-01/02
- ES-ED0806-02
- ES-ED10207-02
- FCD100-0806-01/02
- FCD100-10207-02
Other Information
- Country of Manufacture: Taiwan