Can you tell the difference . . .

Started Feb 1, 2014 | Discussions thread
windsprite Senior Member • Posts: 2,501
Re: The ANSWERS . . .

CollBaxter wrote:

I am a bit underwhelmed with the Canon 300 and the TC2 . for what its worth. I though at 600mm you would get something a bit better. The ZD300 on a very old sensor shows a lot more detail than the canon FF combo at the same EFV.

Collin, I'd agree the E-5 image looks "sharper," but I don't see where it's resolving any more real detail than the Canon one, and very definitely not "a lot more" detail.  Take the Canon image and do a teeny bit of USM and then another teeny bit of large-radius USM for contrast, and the actual detail on the Canon and Oly images looks virtually identical, at least where the feathers are within the DOF (the Canon image looks to be quite a bit shallower).

I'd say that speaks pretty well for the Canon lens, considering it has a 2x teleconverter on it, which I would expect to degrade the sharpness and contrast visibly.

[To go off on several semi-related tangents:]

Only thing is, a 2x is also likely to slow down the AF, which might give an advantage to the Oly setup if you are shooting moving subjects.

You could mitigate that by putting the Canon lens on a crop body with a 1.4x telecon to get around 600 mm EFL with less degradation of AF speed and image quality than you'd get with a 2x.

You don't have the option of putting on a 2x and getting 1200 mm EFL like you do with Oly, though.

However, on Canon you do get to use the 300/2.8 as a really sharp 300 mm lens, which you can't do with Oly, since there is no FF body on which to mount the ZD 300/2.8 to get the same AOV.

Getting back to 1200 mm EFL ... I bet the 7D upgrade will have at least 24 MP and about the same pixel pitch as a 16 MP four thirds sensor.  If they have an in-body 1.3x crop option like Nikon, you can put a 2x telecon on your 300/2.8, and there's your 1200 mm EFL with almost 16 MP, albeit with a smaller VF.

Of course, the Canikon lenses are not designed to be used on a 2x "crop" sensor like the Oly ones are, so in that scenario you might get more detail out of the 1200 mm EFL Oly combo.

Buuuuuuut ... probably there would be no particular resolution advantage for a third-party lens like the Bigma on Oly vs. crop Canikon, and with the latter brands you would have access to more lenses, like the new Tamron 150-600, with the option to use them with many different crop factors, from FF to 2x (and I guess there's 2.8x in the case of the Nikon 1 mirrorless series).  I guess you could adapt the Nikon-mount lenses to Oly, but there would be no AF and also no in-lens stabilization, I assume.

OTOH ... with Oly you do get to use IBIS with any non-stabilized lenses!

It just goes to show how complicated these cross-format comparisons are.  You could go back and forth like the above all day long without being able to declare an all-round "winner."  It's really better to start from the user's requirements and work backward from there, to find the most suitable combination for that particular user.  Threads like this are interesting, though, and a good starting point.


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