Crop Factor, Low Light and Aperture with m4/3 lenses?

Started Jun 15, 2014 | Discussions thread
photohounds
photohounds Senior Member • Posts: 1,154
Re: Crop Factor, Low Light and Aperture with m4/3 lenses?

baxters wrote:

The crop factor is 2. That is why there is an Olympus 25mm f1.8 and a Panasonic 25mm f1.4. Both correspond to a 50mm lens on film. For exposure, the aperture is unchanged by crop factor. Both of these lenses will act like your 50mm f1.7 lens for focal length and exposure.

Depth of field (DOF) calculations do require you to multiply the aperture by 2. So if you like to calculate where a lens will start to go out of focus for blurred backgrounds, you will get less DOF in theory. In practice, you could show this in a lab. Out on the street, you could probably shoot someone with your 50 f1.7 on film or the 25mm f1.8 on an EM10 and both backgrounds will look the same because they are both far enough away.

The light sensitivity of digital cameras is far better than film. Any low light shooting you did with your 50mm f1.7 on film will be easily matched by the two above lenses on the EM10.

By the way, you can use your film lenses on the EM10.

Agree .. and ..
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More for the OP .. The fast primes do the job nicely and produce SALEABLE work, unless you prefer exaggerated OOF effects like disappearing ears and other gimmicks.
Unlike some "legendary lenses" they are sharp wide open too (yes I'm looking at you .. soft 85/1.2) .
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The 75 ... the 45 ... the 17 ... the 12 ... the 12-40 PRO etc, etc.
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Oh . .
In low light (I could hardly see..) they perform well, too.
and trounced the tripod-bound CaNikon co-shooters.

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Wanna go further?
That 42.5mm/1.2 Panasonic is a stellar performer if you actually DO need less DOF (beyond for pub bragging).
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Someone is even making an f 0.85 42 or 45mm!
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Another poster remarked on the maturity of the system comna=ret to similar cameras, I agree, it is very well developed already.
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"Crop" is not really the right word, as the lenses and cameras are DESIGNED for this image size - that's why the primes deliver performance - from wide open.

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Well designed gear performs better for longer than well marketed gear.
Odd that people complain a lens is not sharp enough,
and then proceed to make pics where 95% is OOF ..
General Pics:
http://photohounds.smugmug.com/
Oly and other .. Gear test samples - even RB-67!:
http://photohounds.smugmug.com/Gear-tests
How DO OMDs cope with dim-light action and smoke?
http://photohounds.smugmug.com/Performing-arts

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Olympus M.Zuiko Digital ED 75mm F1.8 Olympus OM-D E-M5 Olympus E-M1 Olympus E-M1 II Samyang 8mm F3.5 Aspherical IF MC Fisheye +8 more
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