Reference: AS-BF-ADM54M48

Brand: ASKAR - Sharpstar

M54/M48 Backfocus Adjuster - ASKAR

In daily astronomical shooting, the backfocus will have an influence. Astronomical photographers are often frustrated by the change of backfocus due to various reasons such as refraction of filters or when using some products with sensitive backfocus. To solve this problem, ASKAR launched the backfocus adjuster, (providing the adjustment range from...

Reference: KE390

Brand: Kepler

Extension Ring M48 4mm - KEPLER

An extension ring with M48 thread of 4mm back focus

Reference: TSVM6840

Brand: TSOptics

Extension ring M68x1 40mm - TSOPTICS

Short extension ring with M68 threads on both sides for exact adjustment of the distance

Reference: UA-EXTM48-20

Brand: Univers Astro

M48 extension 20mm

M48 extension ring with a 20mm back focus

Reference: UA-EXTM48-30

Brand: Univers Astro

Extension ring 30mm M48

Extension ring 30mm M48

Reference: UA-EXTM54-15

Brand: Univers Astro

Extension ring 15mm M54

M54 Adjustment Ring Adding 15mm of Backfocus.

Reference: UA-EXTM42-4

Brand: ASToptics

Extension ring 4mm M42

Extension ring T2 (M42) with a back focus of 4mm

Reference: TSVM6820

Brand: TSOptics

Extension ring M68x1 20mm - TSOPTICS

Extension ring with M68 threads on both sides for exact adjustment of the distance Optical path: 20 mm (the male M68 thread is not taken into account) Length of the male M68 thread: 3 mm Length of the female M68 thread: 8 mm Clear aperture of the adapter: 64 mm

Reference: KE384

Brand: Kepler

Extension Ring M42 4mm - KEPLER

Extension Ring M42 4mm - KEPLER

Reference: TST2V8

Brand: TSOptics

T2 (M42) extension 8mm

Bague d'extension T2 (M42) avec un tirage optique de 8mm

Reference: TSVM6815

Brand: TSOptics

Extension ring M68x1 15mm - TSOPTICS

Short extension ring with M68 threads on both sides for exact adjustment of the distance

Reference: UA-EXTM54-8

Brand: Univers Astro

Bague allonge M54 8mm - Kepler

Reference: SW0185

Brand: Sky-Watcher

1.25" 50mm extension slider

An extension tube with a 1.25" (31.75mm) barrel ideal for extending the focal length of equipment of the same barrel.

Reference: UA-EXTM42-15

Brand: Univers Astro

Extension ring 15mm M42

T2 (M42) extension ring with 15mm back focus

Reference: UA-EXTM54-5

Brand: Univers Astro

Extension Ring 5mm M54 - KEPLER

Extension Ring 5mm M54 - KEPLER

Reference: POA-M48F-M48M175

Brand: Player One

Adaptor M48 Femelle - M48 Mâle 17.5mm - Player one

a extend tube with 17.5mm length