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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....

Hm now I have some numbers to plug in. I was trying to use the sensor density and angle of view for starters but it looks like it might be more complicated for that. Let's use the kit 14-42 lens for starters at the wide 14mm end.

 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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