8-12mm Long 48mm Variable Length Extension (SFE-M48-V)

Name: 8-12mm Long 48mm Variable Length Extension (SFE-M48-V)
Brand: Stellarvue
SKU: SFE-M48-V
Price: 19.14 USD
Availability: InStock
Rating: 4.8 (5 reviews)

8-12mm Long 48mm Variable Length Extension (SFE-M48-V) - Main image

$19.14 ~~$29~~ In stock

Category: Astrophotography Accessories

Description

This is an adjustable 48 mm extension tube that adds 8-12 mm of length. Thread is the standard 2" filter thread size of M48 X .75. The depth of the male thread is 9.5 mm and there is a thin (1.52 mm) threaded locking ring on this thread to adjust the spacing. The female thread is 4.95 mm deep. The body is 2" in outside diameter.

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Express Shipping · United States: $3.99

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United States · Return window (days after delivery): 30. Return method: By mail. Return postage: Seller pays.

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Customer Reviews (4.8 / 5 · 5 reviews)

George ★★★★★ Oct 21, 2026

The machining is precise—the threads on this variable extension spin on butter-smooth without any binding. I was able to dial in exactly 10mm of spacing for my reducer, and it holds firmly with no tilt or play.

Riley ★★★★★ Oct 20, 2026

I needed exactly 10mm of extra back focus for my ZWO camera, and this variable extension let me dial it in perfectly. The locking ring holds tight once you set the length.

Joshua ★★★★★ Oct 18, 2026

Finally, an extension that actually lets me dial in the exact backfocus distance without stacking spacers. The variable 8-12mm range on this 48mm tube saved me so much time getting my reducer spacing perfect.