Apochromatic Refractors
We can offer you a range of very high quality refractors in this category. These include e.g. our two- and three-lens APM Apo instruments, our astrograph series, available as APM or APM-LZOS models. Equipped with Riccardi reducers / correctors or as a high-end version CNC LW II with Feathertouch extracts. All around excellent instruments that should leave no wishes.
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The ASKAR APO 72 mm f/5.6 quintuplet apochromat from Sharpstar is optimized for astrophotography with high resolution cameras
Aperture 72 mm Focal length 400 mm / focal ratio f/5.6 5-element quintuplet design with corrector in tube Two ED glasses in the objective for very good correction of the chromatic aberration 44 mm image circle with full illumination and correction 140 mm working distance for visual observation or focal length reduction Stable 3" dual-speed RAP focuser with 360° rotation 2" and 1.25" receptacles as well as M68x1 external thread for screw adaptations Long adapter from M68 to M48x0.75 camera connection is included in delivery (with 2" filterthrad) Flexible GP/EQ5 style dovetail bar with photo tripod connection and carrying handle with flexible slotted hole Finder shoe for standard finder holder Including inspection check list of the manufacturer The ASKAR FRA 500/5.6 APO quintuplet apochromat from Sharpstar is optimized for astrophotography with high resolution cameras
Aperture 90 mm Focal length 500 mm / focal ratio f/5.6 5-element quintuplet design with corrector in tube Two ED glasses in the triplet objective for very good correction of the chromatic aberration 55 mm image circle with full illumination and correction 158 mm maximum working distance from drawtube with all adapters for photography and observation Stable 3.5" dual-speed RAP focuser with 360° rotation Adapters to M68x1, M54x0,75, M52x0,75 and M48x0,75 are included in delivery Starting with the M48 thread, you have comfortable working distance for all common astro cameras, DSLR and system cameras Flexible Losmandy style dovetail bar with photo tripod connection and carrying handle with flexible oblong hole Finder shoe for standard finder holders Including inspection check list of the manufacturer With the FRA600 F/5.6 quintuplet astrograph, Askar has created a pure-color apochromat for astrophotography with large sensors.
Aperture 108 mm / 4.3" Focal length 600 mm Focal ratio f/5.6 5-element design - the 2-element corrector is permanently installed in the tube 66 mm image circle with full illumination and correction 140 mm working distance for observation with 2" star diagonal Long transition adapter for photography to M48x0.75 with 2" filter thread included Rugged 4" RAP focuser with dual speed reduction and 360° rotation Losmandy style dovetail bar Flexible tube rings with carrying handle and lateral threads for individual adaptations Finder shoe for standard finder bracket Each FRA600 comes with an inspection checklist from the manufacturer and is also tested on our optical bench New 5-element APO astrograph with 90mm diameter and 450mm focal length (F/5)
The optical design shows a polystrehl value of 0,97, indicating a level of correction that is absolutely top of the line.
The three-lens design of the EXPLORE SCIENTIFIC ED-Apochromats provides everything an amateur astronomer desires - at a reasonable price....
Highly corrected 102mm air-spaced triplet apochromat (with three lenses) and carbon fiber tube and a 2.5" high-precision HEXAFOC focuser.
High Quality 127 mm ED Apo by Explore Scientific.
The optical design shows a polystrehl value of 0,97, indicating a level of correction that is absolutely top of the line.
The three-lens design of the EXPLORE SCIENTIFIC ED-Apochromats provides everything an amateur astronomer desires - at a reasonable price.
The three-lens design of the EXPLORE SCIENTIFIC ED-Apochromats provides everything an amateur astronomer desires - at a reasonable price.
Omegon 121mm/678mm Quintuplet Apochromat, flat field and 4" focuser