Askar 135 mm f/4.5 APO telephoto lens - mini guiding scope and travel spotting scope
Askar has created with the FMA135 a compact triplet APO refractor with many photographic and visual possibilities♦ Focal length 135 mm / focal ratio f/4.5
♦ Triplet ED objective with 30 mm aperture
♦ 3-element corrector for perfect image field flattening
♦ Working distance 55 mm from the T2 threaded mount
♦ With just a few hand grips, the telephoto objective becomes a mini guide scope or a compact spotting scope for observation
♦ The photographic field of view is designed up to APS-C format
♦ Precise helical focuser on the lens for accurate focusing - with clamp
♦ Can be easily attached to the telescope instead of the viewfinder - fits all common viewfinder shoes
♦ Fits on any ball head - ideal also for mobile astrophotography with photo trackers like the Skywatcher Adventurer Mini or iOptron Skytracker
The motto of Askar's compact FMA135 is "small but mighty"! It is, of course, an ultra-sharp telephoto lens with fast f/4.5. Unlike the simple camera lenses on the market, the lens is also suitable for the modern, high-resolution astro cameras.
The 3-element F4.5 corrector makes the ASKAR FMA135 a professional telephoto lens for both landscape and astrophotography. The internal blackening and the elaborate multi-coating ensure high-contrast and brilliant images without reflections even under difficult lighting conditions. The use of 1.25" nebula filters is also possible, thanks to the filter thread in front of the lens.
The FMA 135 mm f/4.5 as a telephoto lens
The manual APO telephoto lens is corrected up to full-frame. From the T2 thread you have 55 mm working distance. Ideal for system cameras, DSLR and of course astro cameras. The telephoto lens is so compact that it can be used hands-free. The high speed of f/4.5 allows short exposure times even under difficult lighting conditions.
The FMA 135 f/4.5 as an astrograph
Astrophotographers will be delighted with this compact telephoto lens. Stars up to the edge are imaged crispy sharp, when using cameras up to APS-C format. With 55 mm working distance (T2 mount), you can connect all common cameras. The multi-function mount allows easy adaptation to the finder shoe of your telescope or to a mountable camera mount via the 1/4" female thread.
The FMA 135 as a compact APO refractor and mini-guidescope
The lens provides enough working distance for a 1.25" zenith mirror and standard 1.25" eyepieces. You can make wonderful wide-field observations or simply connect an autoguider and track your telescope cleanly.
The FMA 135 as a spotting scope
The high-contrast optics allow exciting wildlife and landscape observations. In just a few steps, you have turned the telephoto lens into a compact and crisp spotting scope. You can use all common photo tripods, the adapter is already included.
Aperture: | 30 mm |
Lens: | Triplet APO lens with air gap (2 special glasses) |
Focal length: | 135 mm |
Corrector: | 3-element 1.0x corrector for photography |
Focal ratio: | f/4,5 with corrector |
Length: | 113 mm |
Weight: | 280 Gramm |
Camera mount: | M42x0.75 thread |
Working distance: | 55 mm from M42x0.75 thread |
Visual connection: | 1,25" |
Thread on lens side: | M36x0.75 female thread and M28.5 x 0.6 female thread (1.25" filter thread) |
♦ Askar 135 mm triplet objective in the tube
♦ Helical focuser
♦ Corrector
♦ Tube attachment for viewfinder shoe and photo tripods
1.25" adapter
♦ Screws
♦ Quick reference guide