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Wow ... Canon product rush
[quote name='genotypewriter' timestamp='1297130472' post='5943']

It's not just faster, it's also constant. As soon as a zoom becomes a constant aperture lens it's usually much larger than a variable aperture lens of the same range, even if the max aperture of the variable aperture lens is the same as the max of the constant lens.



Not sure I get what you mean here, specific example(s) might help.

Way I see it, for a longer focal length lens, the size will be dominated by the long end of the zoom with the wide end being relatively unimportant. So hypothetically a constant f/4 lens, I can't see that being smaller than a f/2.8-f/4 lens for example. Unless you're comparing the aperture at the wide end, which doesn't make sense to me.

A rough rule of thumb I find that works quite well for comparable (build, quality) longer focal length lenses is to look at the entrance pupil size. It correlates quite well to price, although there is still a relationship between focal length and lens length. Personally I feel that constant aperture lenses are under-designed on the wide end as they should be able to go faster.
<a class="bbc_url" href="">dA</a> Canon 7D2, 7D, 5D2, 600D, 450D, 300D IR modified, 1D, EF-S 10-18, 15-85, EF 35/2, 85/1.8, 135/2, 70-300L, 100-400L, MP-E65, Zeiss 2/50, Sigma 150 macro, 120-300/2.8, Samyang 8mm fisheye, Olympus E-P1, Panasonic 20/1.7, Sony HX9V, Fuji X100.
The new 600D... is it really needed? I'm ok with the new LCD and the improvements in flash controll but I don't understand why they could not wait more to put something more functional and make the 600D to deserve his name over 550D... Am I missing something?


Edit: You guys have seen [url=""]this[/url]?... Nice choice of color...<img src='<#EMO_DIR#>/smile.gif' class='bbc_emoticon' alt='Smile' /> The rainbow battles will begin in the entrance level DSLRs, and Pentax sure has the lead...
This is truly tour-de-force. It is (I think) mean to show Nikon and Sony who is the boss in the photography world. Kudos Canon, but what about lenses for the mere mortals? And no, I'm not refering top the 18-55 IS II. <img src='<#EMO_DIR#>/smile.gif' class='bbc_emoticon' alt='Smile' />

Personally, I really like the slave capability of the 270EX II. I often leave my 580EX at home due to bulk and weight but with the master capability of my 7D this one could be in my bag at all times and offer more lighting versatility.

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