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09/01/2006 04:53:53 PM · #1 |
My EF 100mm F2.8 Macro USM lens arrived today! Definitely different than the kit and zoom lenses I have, and I am having fun experimenting. My questions are:
Does the focus ring ever stop? (It seems to keep turning forever)
If it doesn't stop, how do you know you are as close as possible to the subject?
(Any advice anybody wants to give will be appreciated!)
Thanks |
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09/01/2006 04:59:23 PM · #2 |
| I assume like other USM models it keeps going forever. But not really, the ring just keeps turning. You should feel like a little tension build up when you reach the end of the focus range, but the ring will just keep turning. I imagine it has something to do with the full time manual focus. Hope that helps. |
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09/01/2006 05:07:49 PM · #3 |
| So how do you know you are as close as you can get? |
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09/01/2006 05:10:09 PM · #4 |
I find the easiest way is to put it on manual focus, focus it tot he shortest possible length and then move as close to the subject as possible until it's in focus. I'm sure someone may have a better way though...
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09/01/2006 05:11:29 PM · #5 |
Originally posted by pidge:
I find the easiest way is to put it on manual focus, focus it tot he shortest possible length and then move as close to the subject as possible until it's in focus. I'm sure someone may have a better way though... |
..or buy a focus rail, so you don't have to move the whole tripod.
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09/01/2006 06:01:24 PM · #6 |
| there should be little numbers on the focus ring, the smaller ones mean thats the closest distance of focus. So go to the smallest number then move until the thing is in focus, and you will be at the closest focus distance. |
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09/02/2006 01:54:18 AM · #7 |
| Don't mean to intrude, but I've been thinking about getting this lens. How close can you actually get to a subject at 100mm? |
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09/02/2006 01:59:34 AM · #8 |
if ya got the 50mm portrait lens you can buy a less-than-10-bucks converter ring & mount the 50mm on the macro lens for SUPER SUPER close up shot.  Jacko is famous for this technique & all things macro
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09/02/2006 02:03:32 AM · #9 |
Originally posted by JonPM:
Don't mean to intrude, but I've been thinking about getting this lens. How close can you actually get to a subject at 100mm? |
At 1:1 reproduction ratio, you're focusing at 12 inches. That's from subject to sensor plane. The body and the lens take up about 6 inches of that, so the front element is about 6 inches from the subject. By way of comparison, the 60mm macro focuses to .65 feet at 1:1, but the lens is a couple inches shorter so there's not a huge difference in working distance.
R.
Message edited by author 2006-09-02 02:04:48.
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09/02/2006 02:06:22 AM · #10 |
| dang thats crazy sauce. I think I know what my next lens will be... |
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09/02/2006 02:11:28 AM · #11 |
Originally posted by JonPM:
dang thats crazy sauce. I think I know what my next lens will be... |
Hrmmm... It doesn't really matter how CLOSE you get, in one sense: if a lens focuses to 1:1 reproduction ratio (shoot something half an inch in size and it is half an inch on the sensor) then they all are producing the same image more or less, issues of slight change in perspective aside. Canon makes a 180mm macro lens that achieves 1:1 at 1.6 feet, for example. People who shoot "live" macros of subjects that get skittish (bugs etc) like this lens.
R.
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