Quote:
Originally Posted by lazjen
Using the "final" formula  - SD*((FL-STF)/FL)+(STF/FR) - the result gives the Minimum Thread Size (MTS) to avoid vignetting, right?
If I already know MTS (e.g. 48mm), how do I unwrap that equation to determine STF? |
I have in the past derived an equation but it is telescope specific. I find that it’s generally faster to do trial and error.