IQ of 7d w 15-85mm Vs 6d w 24-105mm?

Started Mar 8, 2013 | Questions thread
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Re: What about The Digital tests?
In reply to qianp2k, Mar 12, 2013

qianp2k wrote:

schmegg wrote:

qianp2k wrote:

technic wrote:

ultimitsu wrote:

Corrner performance is very close, neither is great. But since 15mmm F3.5 is more or less close to 24mm F5.6 on FF, 6D at 24mm f5.6 is indeed a lot better than 7D on 15mm F3.5.

P.S.: I'm a scientist, I have my own thoughts about 'mathematical certainties'

For someone who does not understand such basic principle, you must be a scientist of scientology.

mathematical certainties like yours only exist outside the real world, indeed like in scientology.

I have demo a real world 5000-pixel size photo that shows what amazing resolution a FF 5D2 with 24-105L can resolve. Can you please post a 5000-pixel size APS-C (7D or whatever) + 15-85 photo? Let's compare fine details/resolution please.

I'd personally like to see the same 5000-pixel size photo from the 5D (classic) for comparison. I think that might be particularly illuminating.

5D only takes 4368-pixel and delivers amazing 100% cropped. I am still waiting 7D 100% cropped face snapshot or you can downsampling to the same 4368 pixel. If 7D looks so mushy and noisy at 100% cropped, what's the point of 18mp? Therefore I usually never crop my 60D photos more than 50% as they are simply not good.

You are, of course, speaking about your 60D when you talk about the 7D. I think that's valid enough - but it is noted that you choose to speak about the 7D when you have something negative to say, rather than the camera you personally own.

If an 18MP crop looks "mushy and noisy" at 100%, then that's likely due to the fact that you are looking at a more magnified image.

Don't peep and you wont have the problem.

BTW - that test between the 5D3 and 7D that I've posted a few times shows the 7D at 200% vs the 5D3 at 300%. It's the ultimate in peeping! But it also clearly shows the 7D out-resolving the 5D3. And that's precisely why I don't believe all of what you claim.

In fact, what don't you take my macro challenge. Shoot the same highly detailed subject with your 5D, 5D3 and 60D at maximum magnification?

I have 5D macro shots took years ago. And I can show you later that they are very sharp.

Of course they are sharp.

A camera with just 16 pixels would be even sharper! It wouldn't capture more detail though.

I have not imported them into LR yet. Nevertheless on DXOMark test, 100L or 100/2.8 macro (that I just sold) still have more resolution on 5D than on 7D no mention 5D3. Macro lenses are still 1:1 magnification ratio on whatever cameras, right?

Yep. At max magnification, a macro lens is 1:1, regardless of the size of the sensor. That's why it makes such a good benchmark for comparing resolution.

You'll find that DxO don't test resolution in a way that allows one to sensibly compare sensors of different sizes (as far as I can tell from their limited information on their testing methodology)

I've asked you before if you understand their testing methodologies, but you have simply pointed me to their pages which clearly show them testing sharpness (not resolution).

It seems to me that, rather than arguing the point continually, you have the resources so you should do the test.

I'd like to see you post the results.

Sure I will. And you will see lots of my macro photos soon with Sigma 150/2.8 OS on 5D3. I sold old 100/2.8 macro. I have not taken macro photos for years.

That would be great. Make sure you include the 5D classic too. I'd genuinely like to see how it does in terms of pure resolution. And I promise I wont have bad things to say when the results come in!

BTW - how do you find the 150? Is the OS useful at all for macro work? (I guess you don't know as you say you haven't done any, but I would be interested to know if you try it out)

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