Askar 200mm Focal Length Terrestrial / Astrophotography Camera Lens # ACL200
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This first version of the ACL200 lens is being replaced by a new version. Optically and mechanically, there is absolutely no difference between the two versions, except that:
- The rotator/dovetail assembly has been replaced by a new version that incorporates a Vixen-slotted handlebar for attachment of other accessories (you can purchase the optional ACL200 upgrade kit to convert this lens into the new version), and
- The new version includes a coarse adjustment screw (this cannot be upgraded).
Quick Overview
- Askar 200mm f/4 manual focus lens especially designed for astronomical imaging
- Incorporates six elements in three groups including two ED elements to minimize chromatic aberration and render sharp star images across the field
- Easy to use, just like a manual-focus camera lens, with coarse and fine manual focus rings (requires 48mm T-ring adapter, sold separately)
- Includes rotable collar for framing images and a filter adapter for standard 2" astronomy filters
- Compact and lightweight form factor
Product Details
The groundbreaking Askar ACL200 lens is the first camera lens specifically designed for astronomical imaging. This 200mm f/4 apochromatic lens incorporates six elements in three groups including two ED elements to minimize chromatic aberration and keep star images razor sharp right to the edge of the field of view without the need for an additional field flattener. For astronomical applications, the Askar ACL200 outperforms traditional telephoto and zoom lenses costing far more.
With a focal ratio as fast as f/4, the manual focus Askar ACL200 lens is ideal for deep-sky wide-field astrophotography with full-frame DSLR, mirrorless, and dedicated astronomy cameras using an optional 48mm T-ring adapter. The working distance is 55mm. It can also be used with cropped-sensor cameras for which it will provide a longer effective focal length.The lens includes a manual aperture ring and precision coarse and fine manual focusing mechanisms with a distance scale that make it easy to snap stars into a tight focus. It also incorporates a filter adapter to enable the use of standard 2" astronomical filters.
This lens is equipped with collar that allows 360° rotation for optimal framing of celestial objects. The Arca-Swiss style connection plate offers a 3/8" and 1/4" female threads for mounting to a tripod, and the plate also fits standard Vixen-style saddles. The lens weighs just 1.5kg so it's ideal for use on lightweight star tracker mounts.
With an adjustable focal ratio from f/4 to f/22, it also makes a great camera lens for wildlife, landscapes, and portraiture. The minimum focusing distance is approximately 3 meters.
Specifications:
- Focal Length: 200mm
- Minimum Aperture: f/22
- Aperture Blades: 10 pieces
- Lens Construction: Six elements (three groups of two) including two ED elements
- Closest Focusing Distance: About 3m
- Focus Mode: Manual Focus
- Focus Type: Precise focusing and rough focusing
- Micro-motion distance: 1mm
- Filter Diameter: 82mm
- Maximum Diameter and Length: About 100x195mm
- Weight: 1.5kg
Other Information
- Country of Manufacture: China
