Askar FMA 135mm APO Lens

As its name indicates, FMA135 was born with a primary mirror plus a flattener. The primary mirror features an APO triplet structure with a diameter of 35mm and a focal length of 135mm, one of which is an ED glass.

The flattener contains three elements which is designed to support APS(advanced photo system) sky imaging and to control the performance at the edge of the photo. The exquisite optical design is the major contribution for its matchless ability in both visual observation and astrophotography as well as chromatic aberration control. Further, the FMA135 can also work as an excellent finder or guider. Its lightness and grace make it possible to attach the FMA135 to various cameras with corresponding adapters. Once attached, the FMA135 turns to be a 135mm manual lens, which will absolutely bring you an magnificent experience in ground object imaging.

There is 1.25" female thread at the front of the astrograph suitable for all purchasable 1.25" filters and standard M42×0.75 male thread at the back which accommodates most stock DSLR or astronomy cameras (an extra adapter is needed). Our standard configuration includes a tube ring for the installation of Vixen finder base, a 1.25" visual back for the attachment of an eyepiece or a guiding camera as well as a high-quality focuser (with thread) and a setting thread to avoid any deviation in astrophotography.

As an ingenious optical design, our FMA135 will definitely offer you a super imaging experience.

The FMA135 can be used in 4 different setups

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 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 piggyback camera mount via the 1/4" female thread.

The FMA 135 as compact APO refractor and mini guide scope

The objective provides enough 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 enable 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.

Technical Specifications

Aperture	30mm
Focal length	135mm
	135mm（plus the flattener）
Focal ratio	F4.5
	F4.5（plus the flattener）
Objective type	Air-spaced APO triplet（including an ED glass）
	Sextuplet refractor for APS imaging
Overall length	113mm（photographic mode with flattener）
Total Weight (Including tube ring&dovetail plate）	280g
Rear-end adapter type	M42×0.75 thread（for imaging）
Rear-end adapter type	1.25" visual adapter（for visual observation）
Package information	FMA135（one set）
	Tube ring（one piece）
	1.25" visual adapter（one piece）
	screw（five pieces）
	manual（one piece）