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PostPosted: Sun Dec 16, 2007 2:04 am 

As far as I know, there are zoom lenses with a constant aperture (example:
Canon's EF-S 17-55 mm f/2.8 as well as "normal" zoom lenses like Canon's
EF-S 17-85 mm f/4-5.6.

Since I'm a beginner to digital photography I'm interested in the differences
(advantages/disadvantages) of those lenses.

Thanks in advance for your replies.

:) :) :)

 Post subject:
PostPosted: Sun Dec 16, 2007 3:13 am 
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Joined: Thu Oct 25, 2007 12:06 pm
Posts: 312
Location: Seattle (Home) ~ Taipei (Work)
Hi John,

The biggest advantage you'll get from a constant aperture lens is the ability to shoot in lower light even when you're zoomed in.

The biggest disadvantage is price and weight. The price will go up significantly for a constant aperture lens. Weight will also increase as it takes more glass to give you the constant aperture.

For example many consumer lenses such as the one you noted: 17-85 f/4-5.6 is able to shoot at f/4 at its widest angle, but the aperture closes down to f/5.6 at 85mm thus requiring more light to keep the same shutter speed.

If you buy something like the 17-55 f/2.8 (great lens by the way :wink: ) Then you get the ability to shoot at f/2.8 at 17mm all the way through to 55mm. Many of Canon's best zoom lenses have an f/2.8 constant aperture, 24-70 f2.8L, 70-200 f/2.8L etc.

Some refer to "normal" lens as being a 50mm prime (non-zooming) lens.

Leica M9, Nikon D300s, Leica X1, Canon S95, Zero Image 6x9

 Post subject:
PostPosted: Wed Dec 19, 2007 3:50 am 
Hello Steve,

I'm very sorry for answering you that late but I could not use our phone as well as our PC since there was a cablecut in our place and it took the telecommunication company quite some time to repair the damage.

As for your reply to my post, please allow me to thank you. Your opinion
really matters to me.

Like you, I also believe that the Canon 17-55 mm f/2.8 IS would be an ex-
cellent choice and if paired, say with the new Canon 40D would nearly gu-
arantee outstanding images. So it's very likely that I might go for that combination.

Once again, thank you so much for your reply and good luck to you!!


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