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Old Jun 9, 2005, 9:30 AM   #1
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Do I understand correctly that when reviewing lenses for these cameras, you have to multiply the focal length of the lens you're considering by 1.6x to get the equivalent in 35mm photograhy?

In other words, if I wanted a "normal" lens (i.e. 50mm), then I have to get a 32mm?

Or am I all wet?
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Old Jun 9, 2005, 9:39 AM   #2
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Yes that is correct.
But what is normal?
The human vision FOV is actually closer to a 45mm lens, so a 28mm lens on a 1.6 crop camera would be about right.

Peter.
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Old Jun 9, 2005, 9:39 AM   #3
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That´s correct.

You will have to multiply by 1.6x because of the "film´s" size of the XT and 20D, is smaller in comparison to the 35mm.

To get the 50mm lens,... you need to divide it by 1.6x

SinRastro
PS: PeterP heh you win
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Old Jun 9, 2005, 9:46 AM   #4
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PeterP wrote:
Quote:
Yes that is correct.
But what is normal?
The human vision FOV is actually closer to a 45mm lens, so a 28mm lens on a 1.6 crop camera would be about right.

Peter.
That's why I put normal in quotes.

I was just looking for the equivalent to the 50mm lens.

I found an article here that explains it a bit:
http://www.bobatkins.com/photography...00dlenses.html

I ordered the 20D, and I found the lenses from the EOS630. Its really a nice camera; I forgot how nice it is/was. The lenses I have from it are unremarkable... 50mm 1.8, and a 35-135mm. I ordered the inexpensive kit lens that Canon is offereing as well.

This lens looks interesting:
http://www.amazon.com/exec/obidos/tg...=UTF8&v=glance
But I think I'll do a lot more research while I let my bank account cool down a bit.
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Old Jun 9, 2005, 10:14 AM   #5
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Your 50mm 1.8 especially if it is the original metal mount is actually quite sought after :-) It is an OK, fast, inexpensive lens :-)

That Canon 17-40 F/4 L is a good lens, For an L lens in that range it is remarkabley not expensive. It is ratailing for about 950$cdn, so US price should be about 60% of that, maybe in the 600$us range.

Peter.
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Old Jun 9, 2005, 11:15 AM   #6
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I just looked...the 1.8 is the original mount.

And I'm waiting for the UPS man with my D20. Should be any moment now...
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Old Jun 10, 2005, 3:11 AM   #7
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I'm with Peter on the 17-40 f4. You cant go wrong with this lens for the money.
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Old Jun 10, 2005, 4:57 AM   #8
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The 17-40 is a fine lens, so too is the 17-85. There are lots of threads here debating their relative merits.

But if you want the equivalent of a 50mm then I can highly recommend the EF 28mm f1.8 USM. (*1.6 = 45mm) It's solidly built, has very fast AF, and is excellent indoors and in other low light conditions. I find I actually prefer the 45mm (equiv) to the 50mm on my film SLR.

I also have the 17-85, but I find that since I got the 28mm I have it on my camera most of the time for snapshots. When I need a zoom I switch to the 17-85.

Sigma are also releasing a 30mm f1.4 EX HSM (*1.6 = 48mm), it's eagerly awaited but there are no reviews yet.
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