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Forum: Canon, Nikon, Sony, and Other Camera Brands
02-06-2019, 05:11 AM
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The onyl difference in wording needs to be that since the mFT lens already only fills the tiny mFT image circle, it is cropped already from the beginning. It doesnt happen as a second step by using a smaller sensor behind a large image circle lens.
That sound a litle bit strange, since all the crying for 600mm F4 lenses is ALL about light gathering not much else. So a 800mm F9 (FF equiv.) lens is just that.
There are cheap short 1000mm F10 FF mirror lenses out there, nicknamed "russian barrels" here. I'd like to see a direct comparison between them.
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Forum: Canon, Nikon, Sony, and Other Camera Brands
02-05-2019, 10:19 AM
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If they want to compare things, yes, they definitely need to as cropping (or magnifying to 100%) on your computer changes noise, dynamic range, DoF, background blur just the same way as spedning money on other sensor sizes does.
I am with you that probably not 5% understand this though. This is the reason for the ongoing myth in forums that low pixelcount cameras have less nosie than high pixelcount cameras.
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Forum: Canon, Nikon, Sony, and Other Camera Brands
02-05-2019, 07:54 AM
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I wouldnt call a F1.8 phone lens a "fast lens" when compared to FF lenses. And we compare things here.
The equivalent very slow F9 of the Oly lens expresses both the effects on background sepation and the effect on noise and dynamic range due to the limited light gathering capabilities (4 times less).
If you can live with the noise generated on FF by a wildlife subject or sports action at F9 then the lens is acceptable to you. If the ISO ranges forced by F9 on FF are not what you can accept then the lens is bad for you.
So for a light vacation lens/camera combo for static subjects good. Sports/wildlife: bad.
It is that simple.
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Forum: Canon, Nikon, Sony, and Other Camera Brands
02-05-2019, 02:03 AM
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So it is a 300-800mm F9 lens equivalent.
This super slow lens is not far away from many bridge cameras costing only a fraction and being much more portable.
The sports and wildlife fraction wants 600mm F4 on forums, not even F5.6. Certainly not F8 or even worse like that discussed here.
This Oly lens which you can only use for static subjects in very bright light automatically makes any discussion about autofocus void. Once the subject moves, you'll be at ISO levels nobody wants to see.
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