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What f/stop should I use ?
Lens: DFA 28-105 mm HD Camera: Pentax K1 Photo Location: Arizona ISO: 125 Shutter Speed: 1/25s Aperture: F11 
Posted By: RICHARD L., 10-18-2020, 06:23 AM



Last edited by RICHARD L.; 10-18-2020 at 03:25 PM.
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10-18-2020, 06:40 AM   #2
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Not sure of your "f-stop" no exif data with this photo, great by the way, but I would recommend a Circular Polarizing Filter to cut done on some of the haze.

@RICHARD L. I took the liberty of pulling the EXIF info from your photo, it is presented in below attached screen shot!
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Last edited by SharkyCA; 10-18-2020 at 07:06 AM. Reason: adding exif info from my screen
10-18-2020, 06:49 AM - 1 Like   #3
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ƒ8 on APS_c, ƒ11 or FF or just go for safe with ƒ16.

ƒ22 on FF with a 5omm lens will let you manually focus to a hyperlocal setting that has everything from 6 feet to infinity in acceptable focus. Wider lenses will be ƒ16 or less with ƒ11 being optimal for sharpness and DoF.
10-18-2020, 06:57 AM   #4
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I'd set the lens to f11 and set the focus ring to just a hair before infinity focus and let the camera deal with ISO & exposure. I make the assumption that most of my lenses are losing sharpness by f11 to f16 so I try to stay away from f16 if I can.

10-18-2020, 07:03 AM   #5
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QuoteOriginally posted by pres589 Quote
I'd set the lens to f11 and set the focus ring to just a hair before infinity focus and let the camera deal with ISO & exposure. I make the assumption that most of my lenses are losing sharpness by f11 to f16 so I try to stay away from f16 if I can.
Shooting with brackets, I find ƒ16 to be acceptable. It's rare a land scape really needs ultimate sharpness. But, having 15 feet between the camera and the closest thing in the image helps keep the ƒ stop down. The scene in the end determines what's best. IN the above, I'm guessing ƒ11 was optimal, but on most curves, ƒ8 would have been better if he could have used it. When in doubt, bracket. Make up your mind afterwards,

Last edited by normhead; 10-18-2020 at 07:32 AM.
10-18-2020, 07:29 AM   #6
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Agreed on all points.
10-18-2020, 09:10 AM   #7
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Ha ha ! You guys are funny ! It's the other photographer at the right of the image who is pondering what f/stop to use, not me. I thoroughly tried this DFA 28-105 mm HD lens and now I always use f/11 when I can.

Best regards to all of you !


P.S. Believe it or not, the haze you are seeing in the Grand Canyon in summer is barely diluted smog from Los Angeles, 400 miles away upwind.

Last edited by RICHARD L.; 10-18-2020 at 09:16 AM.
10-18-2020, 09:19 AM   #8
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Didn't even see the guy in the bottom right of the image.

10-18-2020, 09:38 AM   #9
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QuoteOriginally posted by RICHARD L. Quote
Ha ha ! You guys are funny ! It's the other photographer at the right of the image who is pondering what f/stop to use, not me. I thoroughly tried this DFA 28-105 mm HD lens and now I always use f/11 when I can.

Best regards to all of you !


P.S. Believe it or not, the haze you are seeing in the Grand Canyon in summer is barely diluted smog from Los Angeles, 400 miles away upwind.
Now you made me feel dumb.... No Christmas present for you this year.
10-18-2020, 10:27 AM   #10
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Just kidding, Norm ! I love you all !

Regards
10-18-2020, 11:05 AM   #11
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QuoteOriginally posted by RICHARD L. Quote
Ha ha ! You guys are funny ! It's the other photographer at the right of the image who is pondering what f/stop to use, not me. I thoroughly tried this DFA 28-105 mm HD lens and now I always use f/11 when I can.

Best regards to all of you !


P.S. Believe it or not, the haze you are seeing in the Grand Canyon in summer is barely diluted smog from Los Angeles, 400 miles away upwind.
Smog or Smoke from the fires?
10-18-2020, 11:48 AM   #12
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What f-stop you'd use is a function of both the focal length and where you have the focus set to achieve enough DOF assuming shutter speed is no consideration. If there are no near objects closer than 10 meters (like your picture), you have a lot more aperture choices at 28mm that will do the job than you will at 105mm.
10-18-2020, 12:11 PM - 2 Likes   #13
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I've visited the Grand Canyon (North and South Rims) 5 times in the last 8 years and you always see the smog from Los Angeles hanging in the depths of the Grand Canyon during the summer (chemical reaction with the NOx from combustion engines because of the intense sunshine releasing Ozone). Of course the smoke coming from the wildfires just adds up to the mix.

Regards


P.S. I'm sorry if the title of my post confuses people, I just intended it to be some good-humored joke.

Last edited by RICHARD L.; 10-18-2020 at 12:40 PM.
10-19-2020, 09:42 AM - 1 Like   #14
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QuoteOriginally posted by RICHARD L. Quote
P.S. I'm sorry if the title of my post confuses people, I just intended it to be some good-humored joke.
My GX617 camera has no focus feedback. So I really use the DOF scale on the lens to get a feel for focus placement vs focal length vs desired DOF and have had to take test shots to gain the needed experience. The question was real for me.
10-19-2020, 10:03 AM   #15
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QuoteOriginally posted by RICHARD L. Quote
P.S. I'm sorry if the title of my post confuses people, I just intended it to be some good-humored joke.
Every once in a while there will be a post here, someone asking why their lens gives what they believe to be poor optical performance, and the path to improvement lies in part with stopping the lens down. I remember one that went something like a newbie shooting with a Sigma 70-300 on their crop-body digital Pentax and the subject was a wire fence shot wide open and slightly out of focus with the focused subject being a tree or some such thing in the background. "Look at the fence! It's got purple and green fringe! This lens is awful!". A tough shot for a lot of glass; the answer was better focusing found through manual focus and Live View, stopping down, and learning to live with elevated ISO settings to get the shot back into shape.

This is a long winded version of saying "this was still a good thought exercise".
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