16mm長 50mm母轉42mm公延長 (SFE-F50M42-016)

I needed this to connect my camera to the telescope, and the 42mm male threads locked on perfectly with no wobble. The 13mm depth on the female side gave me plenty of grip for a secure fit.

The 13mm deep threads on the 50mm side grabbed securely, finally letting me dial in my back focus perfectly. Fits snug without any wobble — exactly what I needed to eliminate that last bit of vignetting.

Needed this exact 16mm length to get proper spacing for my camera sensor setup, and the threads engaged smoothly without any binding. The 50mm to 42mm step-down is machined precisely enough that my focus holds steady during a long exposure.