View Full Version : Sigma 70-300 APO vs 75-300 IS

03-29-2005, 08:26 AM
Has anybody tried both??? Im concerned with knowing wich of them has the faster autofocus, since I've heard the 75-300 IS is quite slow and not recommended for birds in flight.


03-29-2005, 11:52 AM
I have found the sigma apo and hsm to be slower than the usm on the canons. I would recomend the 70-200 f4L. It is the sharpest lens I own (currently) and is one of the fastest AF lenses I have ever used. I shoot birds in flight with it on my 20D without problem unless they are flying directly at me at a high rate of speed and I don't have time to turn on ai-servo.. I have not played with the ai-focus that turns it on for you yet...

I have used the 75-300 IS and it did not seem that bad... what camera are you planning on using this on since the focus speed can also be slower on some cameras.

03-29-2005, 01:53 PM
Thanks Eagle17,
I've also considered the Canon 70-200 4L on my wishlist, I know this lens is much better in all aspects than the Canon 75-300 IS.....and it's probably that I'll go for this lens.....but the only thing that keep me away from this lens is its size.....would you mind telling me what is the lenght of the Canon 70-200 4L fully extended??? Thanks.

P.D. My XT is coming next week.....Im gonna place my order on friday.

03-29-2005, 04:12 PM

Can't tell you the size of the 70-200 F4, but there are pictures in the review at http://www.the-digital-picture.com/Reviews/Canon-EF-70-200mm-f-4.0-L-USM-Lens-Review.aspx (Canon-EF-70-200mm-f-4.0-L-USM-Lens-Review) that should give you a good idea.

I have the Sigma 70-300 APO but I found it fairly slow to focus on my 20D, but for the price a great lens.


03-29-2005, 08:18 PM
the 70-200 canon does not extend it is all internal. and it is a littile long but I find it far less heavy than the F2.8 version.

also I would have to say that it is no bigger than the 75-300is that i used..

even with out the extra 100mm and is I am happier with the photos from my 70-200mm

03-30-2005, 06:58 AM
Thanks eagle17 and Daragh,

I appreciate your help.....and I guess, finally I'll go for the Canon 70-200 4L since IMO is not so long....I thought this lens needed to be extended for reaching the full zoom range (similar to the 100-400)....I was wrong.

The 70-400 4L has a length of 17.2cms (according to the Canon website) - which IMO is an acceptable size.