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Optolong Filter Spacings

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#1 cheesified

cheesified

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Posted 22 September 2019 - 03:57 AM

Hi, not a regular here so if this was posted in the wrong forums pls re-direct me, thank you.

 

I am suspecting the elongated stars at the corner is due to having the wrong backfocus spacing.

Meanwhile I would like to find out what is the additional spacing due to filter use for optolong filters? Does using a filter add spacing distance into the imaging train?

 

Sample image below. I am currently using a Z61mm equivalent with flattener. Resulting spacing with EFW is 55mm. I've added about 1mm worth of additional spacers as I'm using filters. Should I add more/less?

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  • sample.jpg

Edited by cheesified, 22 September 2019 - 03:59 AM.

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