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Astrophotography with EF-M Prime lenses (PIC)

Started May 8, 2019 | Discussions thread
Marco Nero
OP Marco Nero Veteran Member • Posts: 7,582
To: Noisephotographer Re: 11-22mm @ 22mm
1

noisephotographer wrote:

The other two lenses (28mm + 11-22mm) were both shot at maximum apertures for their respective lenses because they needed every bit of light.

It could make more sense to shoot at 22mm f/5.6 instead of 11mm f/4.

22mm f/5.6 captures twice as much light from distant objects than 11mm f/4. (22/11 x 4/5.6)² ≈ 2

A 22mm crop of the 11-22mm at 11mm f/4 is equivalent to 22mm f/8 on a 6 megapixel Aps-c camera. Though it wouldn't be as bad as one would expect because the low resolution (6 megapixels) gives a read noise advantage. Therefore it's possible that it could perform better at 11mm f/4 despite capturing less light per object.

Oh GOD!  I don't want to go out there again in the cold... but that observation you've made actually piqued my interest.  I will certainly try this soon if nobody else with the 11-22mm lens wants to give it a go.  I think this might have merit enough for an experiment.  Anyone want to give it a whirl?

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Regards,
Marco Nero.

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