Go Back   Steve's Digicams Forums > Digital SLR and Interchangeable Lens Cameras > Canon Lenses

Thread Tools Search this Thread
Old May 4, 2005, 10:46 PM   #11
Senior Member
Trout Guy's Avatar
Join Date: Jan 2005
Posts: 132

You also need to consider a lens at it's widest aperture sometimes gives the poorest results in that the image is not as sharp as when used at one or two stops smaller. I'm not talking about depth of field but rather softness. The high end lenses and usually primes excel at giving you a good sharp image wide open but you gotta pay for what you get.

I just picked up a used Sigma 70-200 f/2.8 that has been tested and is very sharp; you might consider that vs the Canon offerings in the 70-200 range.

OK, waiting for NHL's third party lens comment:blah:

Trout Guy is offline   Reply With Quote
Old May 5, 2005, 2:33 AM   #12
Senior Member
twofruitz's Avatar
Join Date: Mar 2005
Posts: 137

terry@softreq.com wrote:
I always thought the quality of the bokeh was due to a 6-blade versus 8-blade aperture, nothing to do with the speed of the lens.

The aperature controls the depth of focus, the higher (eg. 2.8) the more brokeh you get. Good for portraits ect.
twofruitz is offline   Reply With Quote
Old May 5, 2005, 4:33 AM   #13
Senior Member
NHL's Avatar
Join Date: Jun 2002
Location: 39.18776, -77.311353333333
Posts: 11,331

Trout Guy wrote:
OK, waiting for NHL's third party lens comment:blah:
I'm just a practical guy... (and not blinded by any one brand)

Kind of amusing to see folks talking themselves into a Legend when clearly objective logic indicates otherwise:
What about the higher precision AF sensors used by the 20D (or higher-end cameras) only on lenses of f/2.8 aperture or larger?
-> They are also handicapping their cameras by 'blindfolding' this accuracy away :idea:

FYI - "When the picture is taken, faster f-stop settings also produce more marked defocusing"
... IMHO "it is worth its weight in gold" too :-)
NHL is offline   Reply With Quote

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

All times are GMT -5. The time now is 5:43 AM.