Re: Stowaway, 92TCC and corner stars

Chris White

On Thu, Aug 4, 2022 at 06:11 PM, Roland Christen wrote:
The use of filters requires 1mm increase in back focus per filter. Also 1mm more is needed for camera entrance glass, unless the camera manufacturer takes it into account. There is also a cover over the actual chip which also would need a 1mm increase.
There are some really nice filters out there now that are only 1mm thick.  It is my understanding that you only add 1/3 the thickness of the glass as spacing.  So a 3mm thick filter would be 1mm of additional spacing needed, but a 1mm thick filter would only require 0.33mm. 

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