Canon 24-70mm L Close Focus

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alanmossdan

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Dan
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Hi all,

Looking for some info on the close focus of Canon's 24-70mm f2.8 (not the new mkii).

I am looking at buying this to use primarily for wedding work to go on my 5D mkii as my current option in this range is a Sigma 17-50mm f2.8 on a cropped 60D. Firstly, am I correct in assuming that the Canon on the 5D should give me markedly improved low light performance considering the ISO performance of the 5D?

The next question is that I also use the Sigma (on the 60D) for some product photography - it is well suited with a closest focus of 20cm possible. However, if possible I would like to use the 24-70mm for this work and sell the Sigma (despite my love of it). The specs say though that the closest focus of the Canon setup would be 38cm, but with some reviewers commenting that it is actually more like 20cm for some such reason. Could anybody explain what this reason would be; if it is true for the 24-70mm; and whether I could expect similar results from the Canon vs. the Sigma?

I look forward to responses - many thanks in advance.

Dan
 
0.38 metres for the MkI. Same for the MkII. F4 version can go to 20 cms in macro mode.
 
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I just did a test for you.

1D IV (1.3 crop) and 24-70mm f/2.8

@24mm it does achieve focus lock at 20mm
 
That 38cm distance is from the focal plane of the camera (Ф mark on top of the camera), not from the from element. 24-70L is quite a large lens, so the 38cm is not such a large distance. :)
 
Slow at posting, but here is as close the 24-70L will focus. 5D3 with lens at min focusing distance at 70mm. :)

OO8A2995.jpg
 
For clarity, I used a ruler, measured 20cm from the end of the lens to the subject and it locked focus on one shot mode (focus beep)
 
alanmossdan said:
Ok so 38cm from the focal plane but 20cm from the outer glass....that's probably where my confusion came from.
Click to expand...

That can't be right, the length of the camera with the lens attached is only 170mm
 
No, surely that is right, if the camera + lens is 17cm then add 20cm focus from end of lens to subject = 37cm which is pretty much the 38cm from subject to focal plane (which is almost at the back of the camera).

Anybody got any other comments on the low-light performance with a 5D mkii? I'm hoping for a marked improvement over my current 17-50mm f/2.8 Sigma + 60D setup - would the difference be noticeable?
 
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