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Proper "rule" for pinpoint stars with M43

Started Oct 27, 2016 | Discussions thread
OutsideTheMatrix
OP OutsideTheMatrix Veteran Member • Posts: 9,876
Re: Proper "rule" for pinpoint stars with M43

Giiba wrote:

I have limited experience, but have used the 8/1.8, 12/2, 15/1.7, and 17/1.8 for stars. From what I've seen it is more complicated than a simple linear formula. I maintain:

https://docs.google.com/spreadsheets/d/1-5JkMAHVcVV4zLsEH8xlxoSeuhYURLoJtuJn57N9ues/edit?usp=drive_web

to compare m4/3 lenses and found that a non-linear formula based on angular area of view (AA) seemed most acurate. Doing a regression from the few data points gave me a quadratic equation:

(-1.6*(AA*AA))+(12.7*AA)+(4.5)

I might be over thinking this but....

Giiba, I see that you put 14/3.5 in there! So do you find there is about the same amount of trailing with the 7-14 at 14mm and the 14-42 at 14mm?

If you could do so, would you do one for the 14-42 at 42mm and the 40-150 at 40mm please?  Thanks!

 OutsideTheMatrix's gear list:OutsideTheMatrix's gear list
Nikon Coolpix P900 Olympus PEN E-PL6 Olympus OM-D E-M10 II Olympus M.Zuiko Digital 14-42mm 1:3.5-5.6 II R Olympus M.Zuiko ED 75-300mm 1:4.8-6.7 II +9 more
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