Askar FRA600 4.3" 108mm F/5.6 Quintuplet Petzval Flat Field Astrograph

The Askar FRA600 108mm f/5.6 Quintuplet Petzval Flat Field Astrograph is designed for advanced astrophotography. It features a front triplet lens and a rear doublet field flattener, both constructed with high-quality ED glass. This Petzval design ensures an ultra-flat field and pinpoint stars across the entire image circle—ideal for full-frame imaging.

With a fast f/5.6 focal ratio and 600mm focal length, the FRA600 is capable of capturing wide swaths of the night sky, including galaxies and nebulae. When paired with the optional reducer, it can transform into a fast f/3.9 astrograph. The 66mm corrected image circle accommodates even the largest sensors, and the built-in 4.2" heavy-duty focuser supports all modern imaging gear with precision and no slippage.

• 5-element Petzval optical design for flat-field imaging
• Large 66mm corrected image circle—supports full-frame sensors
• Precision 4.2" focuser with 1:10 dual-speed adjustment
• Retractable dew shield for compact storage and transport
• Red anodized tube rings with multi-point mounting options

• Askar FRA600 108mm f/5.6 Astrograph OTA
• Pair of Tube Rings
• Dovetail Plate
• Handle
• Conical Tube Adapter (M54x0.75 & M48x0.75)
• Dust Cap
• Inspection List
• 1.25" Eyepiece Adapter
• Instruction Manual
• Hard Carrying Case