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 Post subject: Heron
PostPosted: Sat Mar 15, 2008 5:08 pm 
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This picture was taken with the EF-S 18-55mm 3.5-5.6 II kit lens fully zoomed to 55mm on a 400D.

I am trying to work out how much "closer" I could have gotten with a 24-105mm or a 70-200mm lens

Can anyone post a crop of this image that would indicate the field of view at 105mm and 200mm.


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 Post subject:
PostPosted: Sat Mar 15, 2008 5:25 pm 
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Hi mirageii,

It can't use your photo but there's a neat flash utility which can do the job here. You have to be patient while it loads, though, as the web-page is a 1.5 MB download.

Bob.

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 Post subject:
PostPosted: Sat Mar 15, 2008 5:35 pm 
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Cheers Bob,

That's quite a good tool :D



Useful tip for modem/slow link users.... If you right click the link and use "save target as" you can save the SWF file and run it from your desktop. Select IE from list when prompted


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 Post subject:
PostPosted: Sat Mar 15, 2008 5:46 pm 
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Looks like this:
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 Post subject:
PostPosted: Sat Mar 15, 2008 6:37 pm 
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Thomas,

Is there a scientific way to work this out or did you just use your experience/judgement

Thanks anyway, very useful


mirageII


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 Post subject:
PostPosted: Sat Mar 15, 2008 6:44 pm 
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mirageII, here you go:

When you have an image shot with 55mm you get to the "crop"-factor of a say 200mm lens by dividing 55/200=27.5%.
So you multiply the size of your original image (on my monitor 220x146mm) by 27.5% and get to the crop that a 200mm-lens would give: 220x27.5%=60mm and 146x27.5%=40mm, so the crop is sized 60x40mm!
With a 105mm you get 55/105=52.4% and thus a crop sized 115x77mm.

Easy, isn't it :idea:

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 Post subject:
PostPosted: Sat Mar 15, 2008 7:03 pm 
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:D :D :D


Thanks very much.


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 Post subject:
PostPosted: Sat Mar 15, 2008 8:50 pm 
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Nice heron :)
seems like those birdhouses are too small for him though :P

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