More questiona about the a77 and a99

Started Apr 29, 2013 | Discussions thread
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Re: When is f/2.8 not f/2.8?
In reply to JerryCurtis, Apr 30, 2013

I think there is some benefit from a large front element, as well as more exotic materials use to make the lenses and coatings. The dxomark scores measure the actual wide open light gathering capability for a lens:

There has to be a compromise somewhere-- T-stop, CA, sharpness, and size make for a tough balance. Add coatings for flare-- less light. Add APO elements for CA-- less light.

 MediaArchivist's gear list:MediaArchivist's gear list
Sony SLT-A99 Sigma 50mm F1.4 EX DG HSM Sony 135mm F2.8 (T4.5) STF Sony 24mm F2 SSM Carl Zeiss Distagon T* Sigma 35mm F1.4 DG HSM | A +16 more
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