About this product
Part Number: FRA400/5.6
Optical Bench Test
All Askar telescopes are tested in the UK on an optical bench.
This ensures you can be confident your telescope will, from the outset, have well figured optics, negligible false colour and spherical aberration, and no astigmatism (the bane of any optical system!). Star shapes will be round, not triangular, oval or egg-shaped!
New ASKAR FRA400 72mm f/5.6 Flatfield Astrograph
The ASKAR FRA400 (Flatfield Refractive Astrograph) incorporates a five-element design to deliver flat fields and sharp, false colour-free images from edge-to-edge. With a 72mm objective, two ED elements, and Petzval optical layout, this f/5.6 scope has a focal length of 400mm and it’s ideal for capturing stunning wide-field images of the deep sky over a 44mm full-frame image circle. It also performs well visually as a rich field telescope (star diagonal not included).
The ASKAR FRA400 includes a large 3” rack-and-pinion dual-speed focuser that’s fully rotatable through 360 degrees. The focuser tube terminates with an M68x1 thread for direct camera attachment, and it comes with an M68-M48 adapter suitable for connecting most DSLR and dedicated Astro Imaging cameras. It also includes a 2” adapter ring and 1.25”-2” adapter for use with diagonals, eyepieces, or smaller cameras.
The attractive optical tube of the FRA400 is complemented with a highly functional set of aluminium rings, Vixen-style dovetail, and a carrying handle. The rings include separate mounting holes for additional accessories. The entire tube is just 317mm long and weighs 2.6kg. The ASKAR FRA400 also features a retractable dew shield.
While the fast f/5.6 focal ratio is ideal for deep-sky imaging, ASKAR also makes an optional FRA72RD focal reducer (not included) for the FRA400 scope to bring the focal ratio to f/3.9 while still supporting full-frame imaging.
A dedicated Focal Reducer allows the scope to operate at the very fast focal ration of F3.9 and is also full format compatible.
The FRA400 is outstanding value and is a great choice for wide field imaging with the flexibility to work at both F5.6 and F3.9
- Aperture: 72mm / 2.83in
- Focal Length: 400mm
- Focus Ratio: f/5.6
- Objective Type: Quintuplet Dual ED Air-Spaced APO
- Overall length: 317mm
- Tube Weight: 2.56kg
- Total Weight (with accessories): 2.88kg
- Back-end Adapter: M68x1 Male Thread, 2" Adapter / 1.25" Adapter
- Back focus: 140mm
Telescope Field of View Simulator
What's in the box
- Telescope OTA
- Tube rings
- Carry Handle
- Vixen-style Dovetail Bar
- M68 to 2" Eyepiece Holder
- 2" to 1.25" adapter
- M68 to M48 adapter
- Instruction manual
- Quality Control Inspection List
|Average Rating (1 Review): |Great telescope for astro-imaging
Friday, 8 January 2021 | Lee
The Askar FRA400 offers a lot in a compact package, and is good value for money. I've written a more thorough review on SGL: https://stargazerslounge.com/topic/369728-askar-fra400-f56-quintuplet-apo-astrograph-review/
Please fill in the form below to ask a question.