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

Started Mar 8, 2013 | Questions thread
usedtobedontrustme
Regular MemberPosts: 487
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Re: Correct
In reply to qianp2k, Mar 12, 2013

qianp2k wrote:

Mako2011 wrote:

qianp2k wrote:

Mako2011 wrote:

qianp2k wrote:

MAC wrote:


What? You are very confused. Are we talking about 15mm on 7D vs 24mm on 5D to have the same AOV if you shoot from the same distance between camera/lens and the subject?

MAC is correct. You should have read the articles and tutorials I linked.

You seem never read this CROP FACTOR read to understand.

I did, you seem to be misunderstanding the context. No matter, regardless of your level of understanding, it not will not help DXO get more accurate results.

This is a personal insult as you hint you have superior understanding than me. Please elaborate what's my level of understanding from your perspective?

It's you lacking of understanding and photography knowledge as you even didn't understand crop factor (you thought I was talking about cropping) and FOV = AOV (you don't know widely in DPR forums FOV = AOV) as we first exchanged a few weeks' ago, nobody misunderstood except you.

The link I quoted above clearly indicates,

The crop factor is sometimes referred to as "magnification factor",[3] "focal length factor" or "focal length multiplier"

A given lens casts the same image no matter what camera it is attached to. The extra "magnification" occurs when the image is enlarged more to produce output (print or screen) that matches a standard output size. That is, the magnification as usually defined, from subject to focal plane, is unchanged, but the system magnification from subject to final output is increased.

It explains very clearly that a 100mm lens is still 100m focus length on whatever crop format camera. However the reason you could have 160mm FF eq AOV by using a 100mm lens on 7D for example is thru 1.6x crop magnification that pixels are enlarged 1.6x to project onto the same standard output. It's digital zooming actually.

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I think crop size sensors would in effect cause optical zooming, not digital zooming. Digital zooming is expanding available info via software and that is not the case here. With aps-c cameras and lenses the magnification is the affect of the lens directing the light onto the smaller sensor.

Here is some conjecture on my part. I would think that an a asp-c camera with an asp-c lens  gets more magnification from the lens and imprecisions in the less would be more conspicuous under the scrutiny of the magnification.  However, I'm confesson that I never took a lesson.

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Some of my pics are in my DPReview Gallery
dt

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