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12/01/2005 12:19:10 AM · #1 |
1) Has anyone used the Sigma 100-300 f4? Any comments on build,sharpness,etc would be great.
2)I'm trying to decide between the tamron and sigma 180 f3.5 macro lens. Wondering about sharpness, build, noise, af speed, and bokeh. They're the same price so I need some comparisions from owners. The sigma does have nine blades. I hear the larger the number of blades the better the highlights in the oof areas. Rounder or something. Not sure how true this is but I recently read it somewhere.
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12/01/2005 01:37:37 AM · #2 |
PopPhoto has an online review of the Sigma 100-300.
//www.popphoto.com/article.asp?section_id=2&article_id=291
they also have the Tamron tested here.
//www.popphoto.com/article.asp?article_id=773§ion_id=2
They've tested the Sigma 150mm but it's not online.
If I remember correctly, more blades usually makes for a rounder/smoother bokeh.
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12/01/2005 02:48:20 AM · #3 |
Originally posted by danderson107:
I hear the larger the number of blades the better the highlights in the oof areas. Rounder or something. Not sure how true this is but I recently read it somewhere. |
It's very true. 9 is great. 7 is so-so. 5 is weak. The new Canon EF-S lenses use a completely circular, electromagnetic diaphragm, and their bokeh is very sweet.
R.
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12/01/2005 02:56:04 AM · #4 |
Originally posted by bear_music:
The new Canon EF-S lenses use a completely circular, electromagnetic diaphragm, and their bokeh is very sweet. |
Now that's an interesting little tid bit of info... |
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12/01/2005 02:57:30 AM · #5 |
Originally posted by TooCool:
Originally posted by bear_music:
The new Canon EF-S lenses use a completely circular, electromagnetic diaphragm, and their bokeh is very sweet. |
Now that's an interesting little tid bit of info... |
It's called an EMD, and I think it's finding its way into other new canon lenses.
R.
Hmm... Turns out the EMD is just an alternative, more precise, to a completely mechanical linkage. It can, and does, control diaphragms with fewer blades, a normnal number of baldes. But apparently the 60mm does have a circular diaphragm. I donno... Anyway it does have circular bokeh, I know that much.
Message edited by author 2005-12-01 03:02:11. |
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12/01/2005 03:38:21 AM · #6 |
Okay... i've had enough. :)
WHat does this mean?
bokeh.
I have seen some of you use it often, and i feel a bit left out...
Can someone please enlighten me?
Thanks :) |
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12/01/2005 04:04:19 AM · #7 |
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