Help with Edge Hd 8 Backfocusing

Equipment Help Needed Troubleshooting
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HenryScholz avatar
HenryScholz avatar

Hello,

I recently have gotten an Edge HD 8, but I am yet to get the accessories. I have settled on an Asi174mm Mini guide scope and a ZWO Oag-L, but the problem is, with my asi533mm pro (17.5mm with plate) and filter wheel (20mm), I cannot get the imaging train to reach the correct back focusing (133.35mm). The oag L needs an adaptor (5mm, m48) that cannot connect to the edge hd 8 t adapter either (78.35, m42). Would someone be able to help me figure this out?

Thanks in advance,

Henry

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andrea tasselli avatar
andrea tasselli avatar

M48 to M42 adaptor with zero optical depth.

John Stone avatar
John Stone avatar

andrea tasselli · May 2, 2026, 08:16 PM

M48 to M42 adaptor with zero optical depth.

M42 tilt plate. Screws to the front of your ZWO OAG L .

You might already have one on your camera that should be moved to the front of the OAG.

https://agenaastro.com/zwo-m42-sensor-tilt-adapter-plate-m42-plate.html

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