APO telephoto lens Askar 230mm f/4.6 or hand-held refractor or guide tube or spotting scope

APO telephoto lens Askar 230mm f/4.6 or hand-held refractor or guide tube or spotting scope

Askar FMA230 Astrograph and Triplet Apo
ASKAR FMA telephoto lenses are not simple photographic lenses, they are apochromatic lenses optimized for astrophotography. The triple APO lens allows magnifications up to approximately 150x without loss of sharpness. To our knowledge, no telephoto lens in this class can do that. The stars in the image are totally sharp.

The 4-element corrector specially developed for the 50mm triple lens flattens the image field to full frame and improves the focal ratio to a fast f/4.6 with total sharpness. Internal blackening and elaborate multi-coating ensure bright, high-contrast images without reflections, even in difficult lighting conditions.

The FMA 230 mm f/4.5 as a telephoto lens
The manual APO telephoto lens is corrected to full frame. From the M48 thread you have 55 mm working distance. Ideal for system cameras, DSLRs and, of course, astronomical cameras. The high speed of f/4.6 allows short exposure times even in difficult lighting conditions.

The FMA 230 f/4.6 as an astrophotographer
Astrophotographers will be delighted with this compact telephoto lens. Stars all the way to the edge appear sharp and crisp. With a working distance of 55 mm (M48 mount), you can attach all common cameras. The multifunctional mount allows easy adaptation to your stand, photographic tripod or compact photographic Star Trackers, such as Skywatcher Star-Adventurer or to an attachable camera mount via the 1/4" female thread.

The FMA 230 as APO refractor and guide telescope
The objective can be combined with 1.25" as well as 2" accessories and allows wide field observations. Enjoy the landscape or view vast star fields. Use the sharpness performance of the APO lens to view lunar craters, the play of Jupiter's moons or Saturn's rings.

The FMA230 is also a powerful autoguider lens. With the corresponding autoguider, you can guide telescopes up to 10" aperture without any problems.

The FMA 230 as spotting scope or spotting scope
The high-contrast optics enable exciting wildlife and landscape observations. In just a few steps, you have converted the telephoto lens into a compact and sharp spotting scope. You can use all common photographic tripods, the adapter is already included. Use 1.25" or 2" eyepieces with low magnification for bright images, even in extreme lighting conditions, and eyepieces with high magnification for fine details.

General features:

• In a few easy steps, the APO telephoto lens converts into a compact astronomical telescope, a guide tube or a powerful spotting scope for landscape observation.
• Aperture 50 mm
• Triplet ED lens with two APO elements for pure color imaging
• Photographic focal length 230 mm (with 4-element corrector) - focal ratio f/4.6
• Observation focal length 275 mm
• Photographic field of view is designed to full format
• Precise helical focuser on lens for precise, locking focus
• Weight 1045 grams
• Convenient M48 mount with 55 mm working distance (as telephoto lens)
• Suitable for 1.25" and 2" accessories for visual observation
• Multi-function dovetail style Vixen/EQ5
• Well suited for portable astrophotography with Star Trackers like the Skywatcher Adventurer
• Also suitable as a powerful guide telescope
• With a few simple steps, the FMA230 becomes a compact spotting scope for observing with 1.25" or 2" accessories.

Technical specifications:

• Aperture: 50mm
• Lens: triple air-gap APO lens with 2 special lenses
• Lens focal length: 275mm
• Reducer: 4-element reducer and corrector for photography
• Photographic focal ratio: f/4.6 with corrector
• Length: 248 mm
• Weight: 1045 grams
• Camera mount: Thread M48x0.75
• Working distance: 55 mm from M48x0.75 thread
• Visual connection: 1.25" and 2"

what is included in the box?

• Triplet lens Askar 230 mm on tube
• Helical focuser
• Corrector and reducer
• M48 threaded extensions
• 2" adapter
• Adjustable tube rings with universal adapter plate - style Vixen
• Multi-function adapter for viewfinder and photographic tripod shoe and Arca-Swiss style rail
• Dust caps

APO telephoto lens Askar 230mm f/4.6 or portable refractor or guide tube or ground telescope