Manufacturer: Askar Sharpstar
Product number: FMA135

EUR 395,00

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rating: 5.0 of 5
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Askar FMA135 Astrograph and Triplet Apo with Flattener
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 f/4.5 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.

Astrophotographic results obtained with this telescope on Astrobin:
Here you can find some astrophotographs made with this telescope model: Link to Astrobin

The FMA 135 f/4.5 as astrograph for astrophotography:
Astrophotographers will be delighted with this compact telephoto lens. Stars right up to the edge are reproduced crispy sharp when using cameras up to APS-C format. Star imaging is better than with many expensive camera lenses. 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 piggyback camera mount via the 1/4" female thread.

The FMA 135 mm f/4.5 as a telephoto lens:
The manual APO telephoto lens is corrected up to APS-C format. From the T2 thread you have 55 mm working distance. Ideal for mirrorless 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 as compact APO refractor and mini guide scope:
The objective provides sufficient working distance for a 1.25" star diagonal 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 allows for exciting wildlife and landscape observations. In just a few simple steps, you can transform the telephoto lens into a compact and crisp spotting scope. You can use all standard photo tripods, the adapter is already included.

Practical tip from Teleskop-Service - how to achieve good focusing for astrophotography:
The FMA135 is equipped with a helical focuser. Although this works, it is relatively coarse. Especially with very high-resolution astro cameras, very good focusing on the star soon becomes a game of patience. The TeleFokus75 solves the problem. It offers a very precise and, above all, reproducible fine adjustment (see preview photos). When mounting the TeleFokus, we recommend wrapping the front part of the lens with some transparent, pressure-sensitive adhesive tape ("Tesa") to increase the diameter by a few millimeters. This gives the ring a better grip.
Aperture:30 mm
Lens:Air-spaced triplet APO lens (2 special glasses)
Focal length of the objective:135 mm
Corrector:3-element 1.0x corrector for photography
Photographic focal ratio:f/4.5 with corrector
Length:113 mm
Weight:280 grams
Camera mount:M42x0.75 thread
Working distance:55 mm from the 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 lens in tube
Helical focuser
Tube mount for finder shoe and photo tripods
1.25" adapter
Quick Start Guide

Astrophotographic results obtained with this telescope on Astrobin
Here you can find some astrophotographs made with this telescope model: Link to Astrobin

Filter change possible for cameras with 17.5 mm flange focal distance (ToupTek, ZWO)?

Answer from Teleskop-Service:
It is possible to change the filter between the camera and lens.
Working distance of the FMA135 = 55 mm from the T2 thread
TSFSLT2 filter drawer goes directly on the camera
TST2V20 extension is placed between the drawer and the telephoto lens
Flange focal distance is now 55.5 mm - the 0.5 mm compensate for the glass path of the filter.

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Written by Walter Codemo
on 2023-02-08

"Habe es erst heute testen können und bin damit sehr zufrieden."

Written by Jean-Luc Amblet
on 2022-03-31

"Ich bin sehr zufrieden mit diesem Produkt, das meinen Erwartungen entspricht."

Written by Thomas Sikora
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"Verwende das Objektiv für die Astrofotografie in Kombination mit einer Sony Alpha 6000. Bin mit der Abbildungsqualität sehr zufrieden. Konnte keinen Farbfehler feststellen. Sogar mit einer modifizieren Kamera einsetzbar."

Written by Goran Petrovi
on 2021-11-12

"Das Produkt ist gut. Meine Erwartungen sind getroffen. Mit dem Leistung von Teleskop Express bin bis jetzt sehr zufrieden."