Askar Full-frame Reducer Professional Astronomical Accessory for Astrograph
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Specifications
Brand
Product type
Technical specs
Design and durability
Description:
F3.9 0.7x for FRA400C Astrograph:
- Specially designed for the FRA400C, this 0.7x reducer adopts a triplet lens design, it can reduce the overall focal length to 280mm and the focal ratio to F3.9 while providing a flat-field correction. When used with the reducer, the FRA400C supports full-frame imaging and the back focus is a standard 55mm.
- The shorter focal ratio enables the telescope to achieve a wider field of view and faster exposure times, making it ideal for shooting large nebulae, star clusters, as well as faint and fast-moving celestial objects.
- The FRA400C reducer features an M48x0.75 rear-end adapter and has a built-in 2-inch filter thread for convenient filter attachment.
Specification:
- (After attaching) FRA400C Focal length: 280mm
- (After attaching) FRA400C Focal ratio: f/3.9
- Lens Number: Triplet design
- Back Focus: 55mm (from the base of M48 male thread)
- Weight: 0.46kg
- Rear-end thread type: M48x0.75 (M48x0.75 filter thread inside)
Package Included:
- 1 x Reducer
Description:
- The 0.75x full-frame reducer has a quadruplet design. The 0.75x reducer gives 65PHQ a shortened focal ratio of f/4.8 and a shortened focal length of 312mm. This reducer, connected with the astrograph, can effectively shorten the exposure time and dramatically increase your field of view, bringing more convenience and possibilities for your deep-sky astrophotography. The back-focus is the standard 55mm. It comes with two thread adapters of M54, M48 with a built-in M48x0.75 2” filter thread, so it is convenient for connection.
Package Included:
- 1 x Reducer
F5.7 0.76x for 80PHQ Astrograph:
Description:
- The 3-inch 0.76x full frame reducer, with a triplet design and specifically for the 80PHQ, offers a 0.76x reduction in focal ratio, when used with the 80PHQ F/7.5 astrograph, the focal ratio is 5.7, and the reduced focal length is 456mm, effectively shortening the exposure time and dramatically increasing your field of view and bringing more convenience and possibilities for your deep-sky astrophotography.
- The end of the focuser is the multi-functional four-piece photographic adapters, which can be connected to the end thread of the focuser when using. The back-focus is the standard 55mm. It also has a built-in M48x0.75 (2 inch) filter thread that allows you to screw on filters conveniently.
Package Included:
- 1 x Reducer
F4.9 0.7x for 107PHQ/130PHQ Astrograph:
Description:
- The 3-inch 0.7x full-frame reducer adapts for 107PHQ & 130PHQ. It has a triplet design with one ED glass. This reducer, connected with the astrographs, can effectively shorten the exposure time and dramatically increase your field of view, bringing more convenience and possibilities for your deep-sky astrophotography. The back-focus is the standard 55mm. It comes with three thread adapters of M68, M54, M48, so it is convenient for connection.
Package Included:
- 1 x Reducer
F5.2 0.75x for 71F Astrograph:
Description:
- The 0.75x reducer can bring 71F's focal ratio down to F5.2. This is a standard reducer with field flattening capabilities as well. A shorter focal ratio allows the OTA to have a wider field of view and faster exposure times, making it suitable for shooting large areas of nebulae, star clusters, and faint, fast-moving celestial objects.
- The 0.75x reducer adopts a triplet design and supports a 44mm full-frame image circle. The overall weight is 0.23kg. The back focus from the M48 thread is a standard 55mm. Both end threads are M59x1. The 71F photographic extension tube has two sizes of M54x0.75 and M48x0.75 adapters, which can be directly and easily connected to the 71F 0.75x reducer for use. At the same time, the adapter has a built-in M48x0.75 2-inch filter thread, which can be directly installed and used. The overall CNC machined, both end threaded metal caps prevent ash when not in use.
Specification:
- (After attaching) 71F Focal length: 369mm
- (After attaching) 71F Focal ratio: f/5.2
- Lens Number: Triplet design
- Back Focus: 55mm (from the base of M48 male thread)
- Weight: 0.23kg
- Rear-end thread type: M59x1
Package Included:
- 1 x Reducer
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