This is a 63 mm male to 48 mm male adapter that adds 3 mm of length. The 63 male thread is 6 mm long and the 48 mm male thread is 4 mm long. Also includes 48 mm female filter threads which are 6 mm deep.
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Nicely machined adapter, but the flange thickness is 3 mm, not 4 mm as described. For anyone concerned with the length of the male threads, on my example, the M63 thread length is 5.5 mm and the M48 thread length is 4.0 mm. The OD of the flange is 68 mm.
And, as another reviewer noted, the user may want to apply some flat black paint to the interior surfaces.
Reply from Stellarvue: Chuck, thank you so much for pointing out that we had the added length wrong at 4 mm. Yikes! We have changed the website with the correct spacing. Let me know if you need a 1 mm spacer ring and I will gladly send it to you no charge. So happy you pointed out our error. Best Regards, Vic Maris
Received my adapter and it does screw into the focuser tube (m63) just like I was hoping it would and allows me to attach my filter wheel that's m48. The main issue after going out for the first time imaging with it, is that the internal side of the ring is pretty reflective and I have a huge ring reflecting on image after stacking. Can't use until I find a way to matte the ring so it's not so shiny
You can spray paint the part with ultra flat black spray paint and let it dry fully. This will remove any reflections you are experiencing. Please email us if you have any other questions!