Askar M54-to-M48 Backfocus Adjuster The Askar M54-to-M48 Backfocus Adjuster provides continuously adjustable spacing between a telescope or corrector and the camera train. It has an M54×0.75 female telescope connection and an M48×0.75 male camera connection.
Manufacturer model: Askar M54-to-M48 Backfocus Adjuster · Specifications checked against manufacturer data on 2026-11-04
The Askar M54-to-M48 Backfocus Adjuster provides continuously adjustable spacing between a telescope or corrector and the camera train. It has an M54×0.75 female telescope connection and an M48×0.75 male camera connection.
The nominal thickness is 18 mm, with ±2 mm adjustment for a 16–20 mm range. The printed scale is graduated in 0.05 mm increments so a spacing setting can be recorded and repeated. Rotating the body changes the effective separation.
The CNC-machined assembly has two fixing-screw holes. Use it as part of the total camera-spacing arrangement for the particular corrector, including other adapters and filters. The manufacturer also offers an M54-to-M54 version; this record describes the M54-to-M48 version.
Match both thread pitches and genders to the adjoining equipment. The 16–20 mm figure describes adjustable thickness, rather than a clear aperture or a two-axis dimension. Weight, load capacity and a verified clear-aperture value are not published in the checked manufacturer text and are not invented.
Askar manufacturer documentation
This record is the M54×0.75 female telescope to M48×0.75 male camera version, as identified in the existing store technical record and model title. The separately offered M54-to-M54 version is not substituted. Adjustment range is a range, not a 16 × 20 dimension.
| Nominal thickness (mm) | 18 |
|---|---|
| Adjustment range (mm) | 16–20 |
| Adjustment from centre (mm) | ±2 |
| Adjustment scale increment (mm) | 0.05 |
| Locking provision | Two fixing-screw holes |
| Adjustment method | Rotating body with printed position scale |
Ficha técnica
Askar M54-to-M48 Backfocus Adjuster The Askar M54-to-M48 Backfocus Adjuster provides continuously adjustable spacing between a telescope or corrector and the camera train. It has an M54×0.75 female telescope connection and an M48×0.75 male camera connection.
Manufacturer model: Askar M54-to-M48 Backfocus Adjuster · Specifications checked against manufacturer data on 2026-11-04
