About this product
Part Number: FRA600/5.6
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 FRA600 108mm f/5.6 Flatfield Astrograph
The ASKAR FRA600 (Flatfield Refractive Astrograph) incorporates a five-element design to deliver flat fields and sharp, false colour-free images from edge-to-edge. With a 108mm objective, two ED elements, and Petzval optical layout, this f/5.6 scope has a focal length of 600mm and it’s ideal for capturing stunning wide-field images of the deep sky over a 66mm larger than full-frame image circle. It also performs well visually as a rich field telescope (star diagonal not included).
The ASKAR FRA600 includes a large 4.2” rack-and-pinion dual-speed focuser that’s fully rotatable through 360 degrees. The focuser tube terminates with an M90x1 thread for direct camera attachment, and it comes with a handy conical M90-M54/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 FRA600 is complemented with a highly functional set of aluminium rings, Losmandy-style dovetail, and a carrying handle. The rings include separate mounting holes for additional accessories. The entire tube is just 493mm long with the dew shield retracted and weighs 6.5kg.
The FRA600 is built on a Petzval design offering a front triplet and rear doublet for 5-elements including two ED elements for excellent colour correction. The FRA600 provides a 66mm imaging circle - larger than full frame! The two rear lenses have an 80mm diameter to reduce vignetting and ensuring the scope delivers pinpoint stars right to the edge.
- Aperture: 108mm / 4.3in
- Focal Length: 600mm
- Focus Ratio: f/5.6
- Objective Type: Quintuplet Dual ED Air-Spaced APO
- Overall length: 493mm (with dew shield retracted)
- Weight: 6.5kg
- Packing Weight: 7.8kg
- Back-end Adapter: M108x1 Male Thread (without rotator), M90x1 Male Thread, 2" Adapter / 1.25" Adapter
- Included Conical Adapter: M90x1 to M54x0.75, M54x0.75 to M48x0.75
- Back focus: 160mm (from the end of the rotator M90x1 thread)
Telescope Field of View Simulator
What's in the box
- Telescope OTA
- Tube rings
- Carry Handle
- Losmandy-style Dovetail Bar
- M90 to 2" Eyepiece Holder
- 2" to 1.25" adapter
- M90 to M54 / M48 Conical Camera Adapter
- Instruction manual
- Quality Control Inspection List
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