Askar 230mm f/4.6 50mm APO telephoto lens - travel refractor - guiding scope and spotting scope

Askar has created the FMA230, a powerful triplet APO refractor with unique visual and photographic applications

♦ In just a few simple steps, the APO telephoto lens becomes a compact astronomical telescope, a guiding tube or a powerful spotting scope for landscape observation.

♦ Aperture 50 mm

♦ Triplet ED lens with two APO elements for a color-pure image.

♦ Photographic focal length 230 mm (with 4-element corrector) - focal ratio f/4.6

♦ Focal length for observation 275 mm

♦ The photographic field of view is designed up to full format

♦ Precise helical focuser on the lens for accurate focusing - with clamping device

♦ Weight 1045 grams

♦ Practical M48 mount with 55 mm working distance (as telephoto lens)

♦ Suitable for 1.25" and 2" accessories for visual observation

♦ Vixen / EQ5 level multifunction plate

♦ Very well suited for mobile astrophotography with photo trackers like the Skywatcher Adventurer

♦ Also suitable as a powerful guiding telescope

♦ With a few simple steps, the FMA230 becomes a compact spotting scope for observing with 1.25" or 2" accessories

 

Askar FMA230 astrograph and triplet apo

ASKAR FMA telephoto lenses are not simple photographic lenses, they are apochromats optimized for astrophotography. The triplet APO lens allows magnifications up to about 150x without loss of sharpness performance. To our knowledge, no phototele in this class can do that. The stars on the image are correspondingly sharp.

The 4-element corrector specially developed for the 50 mm triplet lens levels the image field up to full format and improves the aperture ratio to a fast f/4.6 with full sharpness performance. Internal blackening and sophisticated multi-coating ensure high-contrast, brilliant images without reflections even under difficult lighting conditions.
 

The FMA 230 mm f/4.5 as a telephoto lens

The manual APO telephoto lens is corrected up to full format. From the M48 thread you have 55 mm working distance. Ideal for system cameras, DSLR and of course astro cameras. The high speed of f/4.6 allows short exposure times even under difficult lighting conditions.
 

The FMA 230 f/4.6 as an astrograph

Astrophotographers will be delighted with this compact telephoto lens. Stars right to the edge are imaged crisp and sharp. With 55 mm working distance (M48 mount) you can connect all common cameras. The multi-function mount allows easy adaptation to your mount, photo tripod or to compact photo trackers, such as the Skywatcher Star-Adventurer or to a mountable camera mount via the 1/4" female thread.
 

The FMA 230 as APO refractor and guidescope

The objective can be combined with 1.25" or even 2" accessories for the ultimate in wide-field observing. Enjoy the landscape or view vast star fields. Use the sharpness performance of the APO lens to see lunar craters, the play of Jupiter's moons, or the rings of Saturn.

The FMA230 is also a powerful lens for autoguiding. With the appropriate autoguider, you can track telescopes up to 10" aperture flawlessly.
 

The FMA 230 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. Use 1.25" or 2" eyepieces at low magnification for bright images, even under extreme lighting conditions, and eyepieces for high magnification to see fine details.

 

Aperture:	50 mm
Lens:	Triplet APO objective with air gap (2 special glasses)
Focal length:	275 mm
Reducer:	4-element reducer and corrector for photography
Focal ratio:	f/4.6 with corrector
Length:	248 mm
Weight:	1045 Gramm
Camera mount:	M48x0.75 thread
Working distance:	55 mm from the M48x0.75 thread
Visual connection:	1,25" and 2"

♦ Askar 230 mm triplet lens in the tube
♦ Helical focuser
♦ Corrector and reducer
♦ Extensions with M48 thread
2" adapter
♦ Adjustable tube clamps with universal adapter plate - Vixen Level
♦ Multifunction adapter for viewfinder shoe and photo tripod and Arca-Swiss-Level rail
♦ Dust caps