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Old Apr 20, 2005, 6:45 PM   #11
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Hi,

"Supposing that in a couple of years, there would be a full frame DSLR for 1000-1300$"

20 megapixels for $1000

I could produce posters (A1 size), but where wouldI put the (giant) printer? :lol:


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Old Apr 20, 2005, 7:33 PM   #12
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eransh wrote:
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Supposing that in a couple of years, there would be a full frame DSLR for 1000-1300$ (or equivalent to 350D or 20D of today), than the 17-40 L would be much sharper in the wide area than the 17-85 ?
This is just a rhetorical question because:
1. The EF-S 17-85mm would not fit a full-frame (retro-focus or something like that)
2. Even if it does the image circle is only ~13mm -> it would vignette at the corner or distort...

-> The 17-40 L is a full frame lens (ie not a 'digital' lens) :idea:
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Old Apr 21, 2005, 10:53 AM   #13
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I may have missed something...

I intend to buy the new XT (350D) body with the canon 17-85 lense.

I own an old EOS Elan an i'm keeping it.

if I put the 17-85 on the new XT (350D) body, I will get equivalent to a full frame of 27-136 mm.

If I put it onmy old EOS elan body, I will get a real 17-85mm.

Am Iwrong with what I wrote above ?

I appreciate if you could also explain what is the circle image of 13mm and what is the meening of a 'digital' lense.
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Old Apr 21, 2005, 12:27 PM   #14
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eransh wrote:
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If I put it on my old EOS elan body, I will get a real 17-85mm.

Am I wrong with what I wrote above ?
Yes - It would not fit!
-> You can't mount an EF-S lens on an EF only body (ie full-frame) - the rear element actually extends in the mirror box of a full-frame on some lens: "When the lens is set to less than 19mm, the mirror hits the rear lens element. But the hacked lens is quite useable between the ranges of 19mm to 55mm. If you are willing to cut off the EF-S mount, then you can have a small and lightweight ultra-wide angle lens for your full-frame SLR camera." - http://www.camerahacker.com/Canon/18-55mm.shtml

... the reverse is true when you mount an EF lens on a 'digital' body the center best part of that lens is used (-> only the 13mm circle), the rest is cropped off - ie lenses that were 'bad' before on a full-frame may actually be pretty good on a 20D/350D
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Old Apr 21, 2005, 1:57 PM   #15
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NHL,

How can you use an EF-S lens on a full-frame body? I mean, after you made it physically work (as described in the camerahacker link you posted). The image it throws on the sensor isn't big enough isn't it?

Seems like this trick only works if you want to put it on a camera that does not have an EF-S mount and is not full-frame (like a 10D).

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Old Apr 21, 2005, 2:19 PM   #16
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barthold

You're correct, but some people are getting quite creative: :-)
http://www.outbackphoto.com/the_bag/...ers/essay.html
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