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at a guess with ep's
Hello,
The total brightness of an object is determined from aperture only, and the f ratio only affecting the magnification when used with eyepieces/lenses.
So, with a given eyepiece used the shorter F ratio will magnify higher and cause the object to be bigger but dimmer. (Same light spread out over a larger area). If you could set the 130 to have the same magnification at f7 and f6.5 you should see no difference in brightness.
Steve
Ps. Sorry was referring to f ratio and not f-stops for lens aperture.
Last edited by mura_gadi; 04-06-2021 at 01:05 PM.
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