# 08 Sep, 2019 21:35
Hi i want some help to find the right distance. I use QHY9 + Starlight xpress FW+ OAG Starlight.|
The optical window from qhy9 removed.
Someone with the same setup for help!!!
# 08 Sep, 2019 23:52
|Hi, is 63mm|
# 09 Sep, 2019 03:24
Interesting, the manufacturer states 55mm. Why is the optimal distance so much larger?
# 09 Sep, 2019 04:50
The distance is 55mm if you use the adapter that comes attached to the flattener or 63mm if it is removed (page 8 of the manual, available on the SW website).|
The point is to cover exactly this distance taking into account the proper distances of your equipment:
Backfocus camera + FW + OAG + The filter itself* + adapters = 55mm
*for the filter a distance of 1/3 of the filter width is usually calculated.
# 09 Sep, 2019 09:43
|The right distance from the back of field flatterer to your camera sensor is 55mm. +-1mm will be ok too.|
# 11 Sep, 2019 17:17
Hi i try to fix all the system with 55mm but it's not possible. I must take off the oag and i don't want it.|
Now i have 58mm. I will try it at next new moon and i will inform you for the result with image!!!
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