48 mm Extension Tube - 5 mm Long - SFE-M48-005

I needed to achieve the requird back focus between my RedCat 51 and ZWO ASI533MC CCD camera. The Stellarvue expert staff helped me do this by promptly sending me this adapter.

This is actually not a variable/adjustable adapter, just a spacer with extended male threads, with locking ring. It suffers from the same drawbacks as very inexpensive versions: thin, nearly flimsy construction, and a smooth outer finish that makes it nearly impossible to grasp one installed.

This item suffers from the same problems as other Stellarvue 48mm adapters: thin, almost flimsy construction, and a smooth outer finish that is impossible to grasp once installed.

Spacer ring M48 5mm was perfect fit and size. Fast shipping high quality item. Fixed my backfocus issue

This increased my backfocus by exactly 5mm. Also it was M48. Can't ask for much more than that.

Perfect fit

Like most looking for extensions, I came across the Stellarvue line. I bought directly from Stellarvue as the shipping was cheaper than most resellers, so go straight to the source. I also bought my scope directly from here. I am a Stellarvue customer for life

Made to exacting tolerances using high grade materials as expected from Stellarvue. I am very happy with this product.

I purchased every M48 extension tube Stellarvue has to offer in order to get the spacing just right for my EdgeHD SCT and I was amazed at the build quality. They are light weight and solid. Combining them allows me to get perfect images without vignetting on a full frame DSLR.

I recently purchased 4 different extensions from Vic at Stellarvue. I've come to expect nothing but high quality coming out of Auburn--- which is what I got. I'll be giving this review for the other 3 extensions.