Back Modifications (2)
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By AM74
This is Amman Citadel, the highest hill in Amman, Jordan. The old city overlooking the new.
The camera was on the ground for this shot.
Uploading an F22 mod-curious to know what you all think is the main difference between F22 and F11 here. I struggle to see.
Also would like feedback on exposure and sharpness.
Many thanks.

Tags: City Clouds Architecture roman columns


dudler Plus
17 1.3k 1696 England
3 Feb 2018 9:09AM
Once you have enough depth of field, stoping down further adds nothing. If you focussed on the hyperfocal distance, which an online table suggests is around nine feet, everythign from a bit over four feet to infinity should be sharp. At f/22, you'd focus a bit over four feet away, and everything down to a fraction over two feet away would be sharp.

However, you'd only see a real difference if you had detail that close to hte lens, AND if you altered the focus between shots. Otherwise, the difference will be less.

And you need to factor in the fact that lens performance drops off towards the smallest apertures, so that the sharpness may actually be less over much of the picture.

And, in fact, i think I see a small difference inthe pebbles in the water at bottom left, which is the only place i'd expect to see an improvement (that is, very close to the camera).

Can I add a rider to all of this? The tables give very precise answers, suggesting that your sharpness will be equally precise. My experience is that this isn't necessarily so: all the calculations work on the basis of an acceptable 'circle of confusion', or degree of unsharpness. What you may find with the latest sensors is that really, really sharp is amazingly elusive: you can see falloff within the zone that tables say is sharp. And, sometimes, acceptable quality way outside it.

Therefore, look carefully, and experiment. See what works for you, with any given lens.
banehawi Plus
16 2.3k 4163 Canada
3 Feb 2018 4:22PM
Bottom area, close to the camera is much sharper at f/22, easily seen. But whats not that easily seen is the image at f/22 will not be as sharp in the main focal plane.. Resolution will be lower at f/22 that f/11. This is physics, nothing to do with the camera or lens.

Another variable that we dont know about here is the point you focused on in this image; you can get the closer area sharper at f/11 if you dont focus on the distance, but on a point approx 1/3 the way into the shot; this is also known as the hyperfocal distance.

In particular, the 24mm focal length on this lens has very significant barrel distortion. I will upload a mod shortly to show what I mean.

3 Feb 2018 7:03PM
Thank you John and Willie for these pearls of wisdom..Much appreciated. Everything that you both said makes a lot of sense.
Love your mod Willie (as always).

I think I focussed on the main column in both shots which is not the hyperfocal distance. Memo to self to always remember that when taking these kind of shots!

Thanks again!

mrswoolybill Plus
13 2.3k 2265 United Kingdom
3 Feb 2018 10:01PM
A couple of thoughts from a totally non-technical non-landscaper:

First of all the human eye does not naturally see everything sharply. We focus on an area in a view and everything else softens around and beyond it. It's not just the physics of the human eye, we prioritise. We decide what we want to look at in detail.

Secondly - look at the view, decide where your interest lies, the area that you want the viewers to look at first, and then again last after they have wandered round the rest of the frame. That's where the focus needs to be for me. More often than not for me it's in the area fairly close to my eye, that's the area that I want to feel that I could reach out and explore.

4 Feb 2018 8:41AM
Thanks Moira. Your helpful insight, as always, is much appreciated.
mrswoolybill Plus
13 2.3k 2265 United Kingdom
4 Feb 2018 8:48AM
Incidentally, this discussion has been going on for well over a hundred years. Check out the work of a wonderful Victorian photographer, Peter Henry Emerson. He got into long arguments with the photography establishment by arguing for much more selective depth of field.

His Norfolk image are magical.
4 Feb 2018 9:23AM
I enjoyed reading that Moira.. Ruffling a few important feathers in that era would have taken a lot of courage! Grin

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