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Not a flame war. A legitimate lens comparison

Started Jul 21, 2015 | Discussions thread
Jim Vincent Veteran Member • Posts: 3,034
Re: Not a flame war. A legitimate lens comparison
1

I could not find the panasonic. You would have to help me with info on this lens. I picked the 1.4 because it was the fastest available without throwing manual focus in. I was trying to get apples to apples. The 1.4 panasonic is equivalent 50 2.8?

I believe your comparison is incorrect.

Yes, with the M43 sensor being half the area of a full frame camera, the 25 f/1.4 provides the same field of view as a 50mm FF, and, it's DOF would be equivalent to a 50mm FF at f/2.8.

However, relative to exposure, at ISO 200 and the same shutter speed the FF 50 would have to be an f/1.4 to match the exposure of the M43 camera with the 25 f/1.4.

You are mis-representing the M43 lenses when you say their f numbers must be doubled to provide equivalence to the FF lenses.  Most people are primarily concerned with the "speed" of a lens (as well as image quality) when considering f stops - DOF is of secondary concern.

 Jim Vincent's gear list:Jim Vincent's gear list
OM-1 Olympus M.Zuiko Digital ED 60mm F2.8 Macro Olympus 7-14mm F2.8 Pro Olympus 12-100mm F4.0 Olympus 100-400mm F5.0-6.3 IS
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