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

Started Jun 15, 2014 | Discussions thread
Ulric Veteran Member • Posts: 4,558
Re: A picture is worth...

eyeswideshut wrote:

Anders W wrote:

eyeswideshut wrote:

Anders W wrote:

Suppose the MFT user can take a certain photo at 25 mm, f/2.8, 1/100 s, and ISO 3200. To capture the same photo, the FF user needs 50 mm, f/5.6, 1/100 s, and ISO 12800. Do you get it?

Have you tried varying shutter speed and leaving iso untouched?

If the MFT user needs 1/100 s to get the shot right, the FF user would need the same, right?

No, wrong. You want to change the aperture to 5.6, so a photographer will do what they have always done: longer exposure.

What about subject motion and camera shake?

What about it? I already accounted for that when I said you could play with sensitivity. However, you set up an equivalence between ff and mft, which already assumes equally efficient sensors and lenses. So to avoid interminable discussions about noise, a photographer would simply extend exposure time.

All you need is 50mm, f/5.6, 1/25, and ISO 3200. Voilá.

At which point the MFT user chooses 25 mm, f/2.8, 1/25 s and ISO 800. "Voilà."

 Ulric's gear list:Ulric's gear list
Panasonic Lumix DMC-GF3 Olympus OM-D E-M5 Panasonic Lumix DMC-GM1 Olympus PEN-F Panasonic Lumix G 20mm F1.7 ASPH +13 more
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