Best optical F-stop
May 29, 2022 18:26:44 #
CHG_CANON wrote:
It's rather poor online behavior to litter on another person's thread. Why do think this litter contributes to the OP's discussion? There was no aspect of the post that suggested 'please dump a bunch of litter on this thread'.
what did it mean to a lens jockey like me
May 29, 2022 18:29:17 #
May 29, 2022 18:29:21 #
Orphoto
Loc: Oregon
I read the OP as saying setting aside all artistic considerations..,
The historic f8 and be there crowd were mostly using medium and large format equipment. Our current"full frame" 35mm equivalent was miniature to them at that time.
Nonetheless most current lenses reach their optical maximums between 5.6 & 8. You may not notice much if any difference at f4 or f11. Some lenses perform remarkably well wide open, usually as a result of lense designs and elements which cut back on abberations.
The absolute best aperture for any given lense will vary. Do your experimentation and look for guidance from web sites using imatest or olaf test results.
Do not expect to see any of this play out in your own results unless scrupulously using best practices as outlined in other threads.
Bear in mind that artistic considerations will trump technical optimums every time. Sometimes you get lucky and both align.
The historic f8 and be there crowd were mostly using medium and large format equipment. Our current"full frame" 35mm equivalent was miniature to them at that time.
Nonetheless most current lenses reach their optical maximums between 5.6 & 8. You may not notice much if any difference at f4 or f11. Some lenses perform remarkably well wide open, usually as a result of lense designs and elements which cut back on abberations.
The absolute best aperture for any given lense will vary. Do your experimentation and look for guidance from web sites using imatest or olaf test results.
Do not expect to see any of this play out in your own results unless scrupulously using best practices as outlined in other threads.
Bear in mind that artistic considerations will trump technical optimums every time. Sometimes you get lucky and both align.
May 29, 2022 18:30:18 #
mwsilvers
Loc: Central New Jersey
William wrote:
wrong
Lots of babel from you, but little in the way of actual facts.
May 29, 2022 18:30:53 #
like a slave driver you become to whip on me get your own UHH away
walk this way sir
May 29, 2022 18:31:18 #
Testing your own lenses is one idea presented in : How to obtain sharp images in digital photography
May 29, 2022 18:33:09 #
CHG_CANON wrote:
Testing your own lenses is one idea presented in : How to obtain sharp images in digital photography
think I did it over four decades ago mate
May 29, 2022 18:33:44 #
mwsilvers wrote:
Lots of babel from you, but little in the way of actual facts.
you read it man
May 29, 2022 18:35:25 #
William wrote:
think I did it over four decades ago mate
Doesn't seem like it.
May 29, 2022 18:38:53 #
mwsilvers
Loc: Central New Jersey
Orphoto wrote:
I read the OP as saying setting aside all artistic... (show quote)
Many fast lenses reach their optical maximums by f/4 and and some even by f/2.8. While depth of field will increase as one stops down past the sweet spot, sharpness across the frame may not. William apparently likes shooting at very small apertures where there is significant diffraction. That is his choice, of course, but those are not optimum apertures for modern lenses.
May 29, 2022 18:44:34 #
CHG_CANON wrote:
Doesn't seem like it.
history marked my time fifty year lens held
May 29, 2022 18:45:37 #
mwsilvers
Loc: Central New Jersey
William wrote:
ever took that test I will see to dog you no more dick head
why send a card to find out you really have Zero ideas too
some here need me most care you don't get off my cloud
babel on dude you pwn it scat/cat
why send a card to find out you really have Zero ideas too
some here need me most care you don't get off my cloud
babel on dude you pwn it scat/cat
While you have posted some interesting photos you have the absolutely most bizarre communication skills I have ever seen on this site. I hope it is not the result of a stroke.
May 29, 2022 18:47:11 #
mwsilvers wrote:
While you have posted some interesting photos you have the absolutely most bizarre communication skills I have ever seen on this site. I hope it is not the result of a stroke.
Or too much holiday cheer.
May 29, 2022 18:49:33 #
mwsilvers
Loc: Central New Jersey
CHG_CANON wrote:
Or too much holiday cheer.
I looked at dozens of his older posts. The text is mostly just as bizarre although he uploads a number of interesting images.
May 29, 2022 18:57:13 #
Strodav
Loc: Houston, Tx
grahamfourth wrote:
I have read that, from an optics perspective only, F-8 is in general the best optical setting for most lenses (though obviously not every image will be best at F-8). If this is true, does this suggest that parameters such as diffraction and aberrations are minimized at F-8? Some other reason? Or is this simply not true and F-8 is not generally the best optical condition?
Thanks in advance for your help, it is much appreciated.
Thanks in advance for your help, it is much appreciated.
For a lot of glass, the data is out there. You just have to do a little digging. I went to DxOMark.com and at random picked a 28-300mm zoom on a Nikon D850 (45.7mp sensor) and looked at the sharpness measurements. DxOMark uses perceptual mega pixels as their metric. The graph shows sharpness by focal length and f stop. Green is "acceptable" sharpness, yellow not so much, and red is pitiful. You can see this lens has a definite sweet spot and areas to avoid. There are similar graphs for vignetting and CA and graphs for distortion and transmission.
As a broad generalization , the more expensive the glass, the bigger the sweet spot. The 2nd graph is sharpness of a professional 70-200mm f/2.8 lens.
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