Skip wrote:
There seems to be a nearly Sigma-like sample variation with this lens. As I said in my reply to Peter, mine's as sharp as it can be. In fact, I did a little comparison similar to yours, and nearly took my 100-400 back! The 28-135 was sharper at that focal length (100mm) than my 100-400, both wide open. And, unlike Chip's experience, my 28-135 focuses faster than any lens I have, with the exception of my 50mm f1.8 MkII and 100 f2. And the difference between it and the 100 f2 is negligible. Skip Middleton http://www.shadowcatcherimagery.com ------------------------------------------------------------------------ --------------------------------- Yes Skip, I did something very similar. The only time I did a lens test was with slide film about 2 years ago. I tested my 135mm F2L, 28-135mm IS, 100-400mm, Sigma's 70-200mm F2.8EX HSM, and a borrowed Canon 70-200mmF2.8L (non-IS). Slides (ISO 100 film) were of a newspaper mounted to a wall. I used F2.8 where available and F8 to compare and had my EOS 3 camera on a tripod. I had a small sign attached to the newspaper to identify each lens as it was used to avoid any mistakes. This way I could see the sign in the picture and quickly note which lens was used. I subsequently projected each on a wall at 30x40 and compared. At F8 results for my 28-135mm were excellent at 135mm and comparable to the 100-400 at the 100mm focal length. I will admit the 135mmF2L was slightly better. Again this was F8. The Sigma was as good (I know that is blasphemy for many) as the Canon at F8 but here is the surprise, at 200mm F2.8 the Sigma was slightly better (even though it is not beige). What is noticeable is that the Sigma has a slight pink or warm tone, while the Canon is neutral. I have heard the newer Canon 70-200mm F2.8 IS lens is suppose to be sharper but have not had chance to test that one. For me its clear. Not to date myself but years back magazine editors were asked to compare a slides taken with Nikkor lens v. an Olympus Zuiko lens. The slides were unmarked. Only one editor got it right, because the Zuiko lens was slightly warmer and he knew this. Disclaimer: These test were subjective and used a film not digital SLR. I used my own personal lenses so your results could be different. Peter K * **** ******* *********************************************************** * For list instructions, including unsubscribe, see: * http://www.a1.nl/phomepag/markerink/eos_list.htm ***********************************************************
