Product Description: SVBONY SA404 adapter is designed for SV41 Mak (Maxthofukassegrain Telescope) spotting scope with M48 thread. SA404 is used to convert a M48 male thread to a M42 male thread. Camera adapter allows you to use Canon / Nikon / Sony cameras It also works with the 1.25" telescope eyepiece, so you can use the telescope eyepiece with the SV41 spotting scope. If you have any other scope with M48 screw, the SV404 will also work with that scope. Specifications: Material: Aluminum Alloy Interface: M48 female screw to M42 threaded (1.25" hole) Primary Mirror Interface: M48X0.75 Accuracy: 0.1mm Height: 31.5mm Net Weight: 70g Product Dimensions: 54*31.5mm Set up and get good performance. The combination is as follows: No Barlow: SV41-SA404-SV135 (F9334G-W9165A-W9105A) SV41-SA404-SV170 (F9334G-W9165A-W9130A) SV41-SA404-SV171(F934G-W9165A-W9130A-W9133335A-W913335A-W935A-W9335A-W9135A-W935A-W935A-W935A-W9135A-W9135A-W9135A-W9135A-W935A-W9135A-W9135A-W935A-W9131A) SV41 -SA404-SPL32mm Eyepiece (F9334G-W9165A-W9101A) SV41-SA404-WIFI Camera SC001 (F9334G-W9165A-F9373A) SVBONY2x Barlow Lens F9146A SV41-SA404-Barlow-SV1-Barlow 35 (F93 34G-W9165A-F9146A-W9105A) SV41-SA404-Barlow-SV170(F9334G-W9165A-F9146A-W9130A) SV41-SA404-Barlow-SV171(F9334G-W9165A-F9146A--F9146A--F9146A-W9131 A)