For those of you who own a Canon 24-105 F4L lens,at what F-Stop setting is it it's sharpest?
Thanks.

Mine is surprisingly crisp from f4 up. At 5.6 to 8 it's excellent and by 16 on a 5D you can jsut start to see some slight sofrtening at 100% on a monitor.

Mine is optimal at f/11 but f/8 shows very little deterioration. These two f-stops give magical results. f/5.6 is very good and f/4 does show some blooming. I typically increase the ISO to avoid f/4 if I can.
I use the lens on a 40D.

This lens is one of Canon's better zooms. If I have the time and light to carefully focus, f/8 is very sharp. I have sold 20x30 gallery prints from this lens on a 1DsII. If there is any doubt about focus being dead on, I may close down one stop to f/11 to get the increased depth of field. F/8 is best, but f/11 isn't far behind!

Fred

I really enjoy using this lens and have taken some great pictures with it.
It is sharpest at f/5.6 - f/8 at shorter focal lengths(ie: 24, 35, 50mm) and at f/8 - f/11 at longer lengths (ie: 70, 105mm).
Take a look at the results on SLR Gear: http://www.slrgear.com/reviews/showproduct...duct/145/cat/11

John

www.igelimages.com

i agree - mine's not bad in the center at f4, but the corners don't look good until 5.6. all things being equal, i try for f8

my only gripe is the substantial distortion - i end up using PT Lens when straight lines are involved - but have trouble remembering not to frame too tightly for images that will need correcting