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Old Apr 25, 2005, 12:27 AM   #11
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IMO this is a no brainer - Check out this MTF of the EF 300mm f4.0L IS USM prime:

FYI - http://www.photographyreview.com/PRD_85165_3128crx.aspx
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Old Apr 27, 2005, 2:13 PM   #12
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NHL wrote:
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IMO this is a no brainer - Check out this MTF of the EF 300mm f4.0L IS USM prime:
Not sure what is a no brainer NHL? Compared to the Sigma 100-300 this MTF isn't any worse or better.

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Old Apr 27, 2005, 4:05 PM   #13
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barthold wrote:
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Not sure what is a no brainer NHL? Compared to the Sigma 100-300 this MTF isn't any worse or better.
The Canon blue curves are @ f/8 -> Sigma red & green curves are wide open which are higher than Canon's black (@ f/4)
i.e. the Sigma is almost as sharp wide open (worst case) as the Canon closed down by 2-stop (best case)!

IMO both lenses are just plain excellent and anyone would be satisfied with either - The 'no brainer' for me is that the lower priced Sigma has the upper edge and being a zoom makes it all the more flexible:
http://www.bhphotovideo.com/bnh/cont...ist&sku=217725
http://www.bhphotovideo.com/bnh/cont...=129188&is=USA
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Old Apr 28, 2005, 11:50 AM   #14
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Duh, I totally fell for the Sigma color coding. I assumed it meant two different apertures, just like Canon's color coding!

Yes, a zoom is always nice especially if it beats a prime

Does a Canon TC fit on a Sigma lens? I would guess so.

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Old Apr 28, 2005, 12:19 PM   #15
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barthold wrote:
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Does a Canon TC fit on a Sigma lens? I would guess so.

Barthold
I do not believe so. The canon TCs were specifically designed for the L telezooms and I do not believe they work with a Sigma - the sigma being 3rd party will, however, work on a Canon lense.
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Old Apr 28, 2005, 12:28 PM   #16
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JohnG

Actually the Canon teleconverters work on my Sigma 120-300 f/2.8 EX - They don't work on the 70-200 f/2.8 EX because of the rear elements on the smaller zoom, but there's plenty of clearance on the bigger Sigma zoom for the Canon's protrusion to fit...

I just don't know about the 100-300 f/4 EX though :O


-> So barthold I highly recommend the Sigma 120-300 f/2.8 EX to you - You can create beautiful portraits of your baby outdoor with the amazing 'bokeh' of this lens and have the capability for birding with a 600mm to boot! :-)
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Old Apr 28, 2005, 1:34 PM   #17
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-> So barthold I highly recommend the Sigma 120-300 f/2.8 EX to you - You can create beautiful portraits of your baby outdoor with the amazing 'bokeh' of this lens and have the capability for birding with a 600mm to boot! :-)
I would, except it does not have IS. That makes me hesitate. I'm an IS addict :-) How heavy is that lens?

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Old Apr 28, 2005, 3:59 PM   #18
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barthold

With the aperture being the ratio of focal lenght over the effective opening of the lenses - Any fast 300mm f/2.8 will be big and heavy -> you are getting a lot of glass here: " ...and this amazing zoom is actually smaller and lighter. The lens is a diminutive 10.6" long without the hood and weighs in at under 6 lbs! How they manage to build this complicated lens (it has 18 elements in 16 groups!) and keep it this hand holdable is beyond me" http://www.shutterbug.net/test_repor...gma/index.html
You can shave 1/2 the cost, 1/2 the size and 1/2 the weight by going to the f/4 (ditto with the 70-200 f/2.8 ) :idea:
... You'll gain in sharpness but lose out on the 'Bokeh' - such is life


I shoot mostly handheld and as you can see from the examples on the 2nd link of this thread, with panning @ 1/90-1/250s the images are still crisply clear with no IS. This is what I don't understand - why does everyone want IS to shoot in the dark? Isn't photography all about lighting - The control of light 'break' or 'make' a picture. You know that very well with your multiple wireless flashes set up...

-> With good lighting why do you still want IS???
I buy the fast lens because of their desirable 'bokeh' - look at my images... I shoot wide open because of the defocus in plain sun not because it's dark!
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Old Apr 28, 2005, 5:21 PM   #19
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Maybe I don't have as steadfast of a hand as you do....

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Old Apr 28, 2005, 11:16 PM   #20
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barthold wrote:
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Maybe I don't have as steadfast of a hand as you do...
This is something I would use on my wife to get me an IS lens... :-) :lol: :G

The truth is: http://home.earthlink.net/~terryleed...tes/tables.htm
Even @ EV-10, if one bumps the ISO to just 200 (or may be 400) with an f/2.8 the shutter speed kind of make IS irrelevant
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