More questiona about the a77 and a99

Started Apr 29, 2013 | Discussions thread
Amateur Sony Shooter
Senior MemberPosts: 5,320Gear list
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Re: When is f/2.8 not f/2.8?
In reply to JerryCurtis, Apr 30, 2013

JerryCurtis wrote:

Amateur Sony Shooter wrote:

Even if they are all F2.8 lens, 70-200 at tele end will receive less light,

Please explain this statement, with references, if you would?

Hi Jerry, I think MediaArchivist explained well in his post. Basically if you try 70-200 at F2.8 for example (fixed ISO), at 70mm and 200mm end, you will see difference in shutter speed. That means you need to let more light in at 200mm end. Cheers!

 Amateur Sony Shooter's gear list:Amateur Sony Shooter's gear list
Sony RX100 Sony SLT-A99 Sony 70-200mm F2.8 G Sony 16-35mm F2.8 ZA SSM Carl Zeiss Vario-Sonnar T* Sony 24-70mm F2.8 ZA SSM Carl Zeiss Vario-Sonnar T* +6 more
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