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Re: the 45mm doesn't provide shallow enough DoF... [image + shooting notes]
In reply to ryan2007,
6 months ago
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ryan2007 wrote:
Bob Meyer wrote:
ryan2007 wrote:
Three things effect depth of field. Focal length, aperture and camera to subject distance.
Focal length doesn't affect DOF except as it affects camera to subject distance. Take two shots from the same positions, one with a 100mm f2.8, the other with a 50mm f/1.4, then crop and enlarge the second image to the same size as the first. DOF will be identical.
Nope,
What do you do if your 40 feet from the subject. You have a 50 1.4 and a 100 2.8 which is still too short and you can't crop the image to "fake it" or whatever. You need the lens to do the work.
If you need to fill the frame by cropping is not good unless you want to loose that "pixel" information.
I can take a 300 mm 5.6 lens to your 50 1.4 and not have to crop anything at the working distance.
A telephoto lens inherently has shallow depth of field and a wide angle lens has greater depth of field no matter the f-stop. The aperture enhances that effect.
Take a the equivalent 300 mm lens at 5.6 and the other at 2.8 from the same 20 foot distance. That 2.8 lens has shallower DOF and will blur the background more so.
This is photo 101 stuff.
Just to throw some real-world numbers into the discussion, from the EXIF data:
--
"If you simplify your English, you are freed from the worst follies of orthodoxy. You cannot speak any of the necessary dialects, and when you make a stupid remark its stupidity will be obvious, even to yourself." - George Orwell "Politics and the English Language"
"Unfortunately, in digital photography a lot of people are seeing pixels, not photographs ... Everyone together now: it's not the pixels. Sing it with me." - Thom Hogan
"If you pick up a camera with any sort of serious intent, you will at least occasionally need to use a flash. Done deal. Lock solid, Take it to the bank." - Joe McNally
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