Originally Posted by quant2325
Sigma is like most brands making pro quality and lesser quality lenses, both in terms of build and optical quality. Some are better and better values than their name brand counterparts, and some are worse. Thank you Photozone for honestly testing so many lenses with no manufacturer advertisement $ to cloud their research. Here is a link to lens testing for your Cannon: http://www.photozone.de/Reviews/overview#canon_aps
Good summation, and good link!
Another site I like is Ken Rockwells. http://www.kenrockwell.com/index.htm
When I got my first DSLR his honest, opinionated translation of the owners manual was great. Sort of a "everything the manufacturer knows but won't tell you" about all the adjustments. Not afraid to say what he considers important or trivia and use terms like "never".
With repect to the original post, which I have hijacked in my babbling, I see there is a guide to Cirque's new camera on the site.
ISO: I use 100 in daylight. If the light gets dim and my images would get blurry from slower shutter speeds I increase the ISO to 400, 800 or 1,600. I never bother with in-between settings like 250 or 640. Unlike film, the 20D looks great at high ISOs, so I use them anytime I need them. I'd much rather have a slightly grainy but sharp image than a less grainy and blurry one. See examples of the noise and grain on my noise comparison page. I explain how to set these on my Controls page, and I explain ISO (sensitivity to light) on my ISO page.
White Balance: I use AUTO. I explain how to set these on the 20D at Controls. See my White Balance Examples page and my White Balance page for why you'd want to change them.
Quality: I shoot Large JPG NORMAL, which shows as L and a stair-step icon on the rear and top LCDs. Large is 3,504 x 2,336 pixels image size. I don't bother with RAW. See RAW vs. JPG and file format examples from a Nikon D200 for explanations and examples of the various settings. I explain how to set these at Menus.
For parties or sports where' I'll be shooting hundreds and hundreds of images, I shoot Medium Normal (M and stair step icon) to save file space. The images still look great!
I've made 12 x 18" prints of the same shot and seen no difference among the file types. Don't worry!
I never use FINE, which is the quarter circle in place of the stair step icon. It looks the same to me and takes up twice the file space.
Parameters: I prefer the vivid color I get from Fuji's Velvia 50 film, so I tweak the 20D to give color as vivid as I can get.
To do this, press MENU, spin the knob clockwise to get to Parameters (the last red entry), press SET to get to the Parameters menu, rotate the dial 3 clicks clockwise to get to the Saturation setting, press SET to allow you to adjust the Saturation setting, spin the dial 2 clicks clockwise to the maximum Saturation, and press SET again to record the change.