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DPChallenge Forums >> Hardware and Software >> Canon 17-55mm 2.8 IS - Macro?
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Showing posts 1 - 12 of 12, (reverse)
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05/30/2008 12:51:42 AM · #1
I got my 17-55 2.8 IS today and was playing around with it. It was night out so I didn't get any test shots (though I'll get some tomorrow).

Anyway, as I was playing around, I noticed that I could get REALLY close to stuff and the lens would still focus. Does this lens double as macro or does it at least have a very close focusing distance? I mean, I literally had the rim of the lens almost touching the subject and it was still focusing.
05/30/2008 08:27:08 AM · #2
?
05/30/2008 08:39:40 AM · #3
let's see some test shots then ;-)

I suspect this just has a very close focusing distance. Have a look near the lens mount as to what the ratio is.

Macro will same 1:1.

Cheers,

Iain
05/30/2008 09:39:54 AM · #4
Minimum Focus Distance 1.15' (0.35 m)

05/30/2008 10:05:14 AM · #5
and who says quality control tolerances can't lean in the direction of the consumer?

:)

Originally posted by KevinG:

I literally had the rim of the lens almost touching the subject and it was still focusing.

05/30/2008 10:21:02 AM · #6
Originally posted by KevinG:

I mean, I literally had the rim of the lens almost touching the subject and it was still focusing.


That's sort of a subjective statement, though :-) I mean, if you were shooting a polar bear, say, and were 1 foot away that would be "nearly touching", but if you were shooting a mosquito it wouldn't be especially close, right? Jejeje™

R.
06/07/2008 11:48:50 AM · #7
Good info here that will provide clarity: //photo.net/bboard/q-and-a-fetch-msg?msg_id=00KTro

Excerpts:

Min. Focus Distance:
""Focus Distance" is offically supposed to be measured from the Nodal Point of the lens, which is where the optical path of the light flips or reverses. This is usually inside of the lens around where the shutter is located, but can actually vary with the lens design."

Working Distance:
"the distance from the front element to the subject is called the "working distance", and is a useful parameter to keep in mind."

I will measure my minimum working distance at 55mm and post this afternoon for my 17-55 2.8 IS.
06/07/2008 02:12:17 PM · #8
My unscientifically measured working distance for the 17-55 2.8 IS zoomed in at 55mm on a 30D was about 5.5 inches(14mm).
06/07/2008 03:03:41 PM · #9
You mean 14cm?
07/03/2008 06:54:02 AM · #10
yep, sorry, :0

14cm working distance.
07/03/2008 10:08:37 AM · #11
If you can fill the frame with a silver dollar (or any crown size coin) and have it in focus, then it is a macro lens.

ETA: Not taking into account sensor size adjustments.

Message edited by author 2008-07-03 10:09:12.
07/03/2008 03:17:32 PM · #12
A $10 extension tube will make anything a macro :)
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