Luminous Landscape Forum

Equipment & Techniques => Cameras, Lenses and Shooting gear => Topic started by: Killer Angel on December 20, 2007, 01:15:30 am

Title: Canon 24-105 F4L Lens Question
Post by: Killer Angel on December 20, 2007, 01:15:30 am
For those of you who own a Canon 24-105 F4L lens,at what F-Stop setting is it it's sharpest?
Thanks.
Title: Canon 24-105 F4L Lens Question
Post by: sojournerphoto on December 20, 2007, 05:34:26 am
Quote
For those of you who own a Canon 24-105 F4L lens,at what F-Stop setting is it it's sharpest?
Thanks.
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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.
Title: Canon 24-105 F4L Lens Question
Post by: bernardd on December 20, 2007, 06:53:06 am
Quote
For those of you who own a Canon 24-105 F4L lens,at what F-Stop setting is it it's sharpest?
Thanks.
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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.
Title: Canon 24-105 F4L Lens Question
Post by: Fred Ragland on December 20, 2007, 11:01:38 am
Quote
For those of you who own a Canon 24-105 F4L lens,at what F-Stop setting is it it's sharpest?
Thanks.
[a href=\"index.php?act=findpost&pid=161918\"][{POST_SNAPBACK}][/a]
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
Title: Canon 24-105 F4L Lens Question
Post by: JohnIgel on December 21, 2007, 01:05:06 am
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 (http://www.slrgear.com/reviews/showproduct.php/product/145/cat/11)

John

www.igelimages.com
Title: Canon 24-105 F4L Lens Question
Post by: stever on December 21, 2007, 01:50:18 pm
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