tan_21
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Backfocus on WO Z61+flat61A
in Getting Started Equipment Help and Advice
Posted
Hi,
I have a WO Z61 with a Flat 61A adjustable Flattener. How do I calculate the correct backfocus? My sequences are:
1) Z61 + 61A (locked at zero) > M42/M48(16.5mm) > M54/M48(2mm) >ZWO EFW2" (20mm) > 11mm camera ring > 6.5 mm Image Sensor ZWO ASI1600MM Pro = 56 mm.
2) Z61 + 61A (locked at 11.7) > M42/M48(16.5mm) > M54/M48(2mm) > ZWO EFW2" (20mm) > 11mm camera ring > 6.5 mm Image Sensor ZWO ASI1600MM Pro = 67.7 mm.
Which one is correct? or neither of them are correct.
Thanks in advance!