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) has a 5-element Petzval optical design (front triplet and rear doublet) that includes two ED glass elements for excellent colour correction.
The imaging circle is an impressive 66mm - larger than a full-frame sensor!
The two rear lenses have an 80mm diameter to reduce vignetting and ensure the scope delivers pinpoint stars to the edge.
It also performs well as a rich field telescope for visual astronomy (star diagonal not included).
The large 4.2” Rack & Pinion dual-speed focuser is fully rotatable through 360 degrees. The focuser tube terminates with an M90x1 thread for direct camera attachment and includes a handy conical M90-M54/M48 adapter suitable for connecting most DSLR and dedicated Astro Imaging cameras. It also has a 2” adapter ring and a 1.25”-2” adapter for use with diagonals, eyepieces, or smaller cameras.
The FRA600 is supplied with aluminium tube-rings, a Losmandy-style dovetail, and a carrying handle. The rings have additional mounting points for accessories.
The entire telescope is just 493mm long, with the dew shield retracted and weighs 6.5kg.
- Aperture: 108mm / 4.3in
- Focal Length: 600mm
- Focus Ratio: f/5.6
- Objective Type: Quintuplet Dual ED Air-Spaced APO
- Overall length: 493mm (with the 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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