Depth of Field?

fracster

fracster

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Ade
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People ask about depth of field and F numbers quite often. I shot both of these yesterday with this section in mind. Hopefully these two simple images will show the difference,the first is shot at F2.8 which gives a very narrow depth of field,hence the chain links being out of focus everywhere except the very middle.Now compare the difference to the second image shot a t F22, nearly all the chain is in focus. F numbers inbetween will give differing depth of field. Have a practice and you will see exactly what differing F numbers do. Set up a similar image and take shots at different F numbers and the results will speak for themselves.


This is a very basic lesson for beginners, hopefully it will help some people grasp the depth of field concept.


F2.jpg



F22.jpg


Also, if you look at the exif data in the bottom left of each image, you will see how the differing F numbers directly effect the shutter speed,But that is another subject.
 
Ah, ok then, scrap this then........:)

But it appears the other is, yet again ,getting into technicalities that beginners don`t want/need to know.
 
Sadly, when a thread is started with no clear definition of its purpose it is to be expected that the discussion wanders off course. The rot set in as early as post #9, when exposure problems were noted. Since nobody stepped in to constrain the discussion to DOF alone the whole thread seemed like fair game to meander wherever the discussion fancied. I did suggest that for future threads it would help if their purpose was defined. It might even help a little if the thread title actually gave a clue too, but it's not my thread so it's not up to me to moderate it. Hopefully a lesson has been learned for subsequent threads in the series.
 
Your bang on right Tim.

This is a Talk Basics section, specifically for beginners,seems some are forgetting that little bit..............:lol:
 
Well I was as guilty as anyone of talking technical in that thread, but only because questions were raised that needed proper answers, and proper answers do sometimes have to get a little technical if the explanation is to mean much.
 
That thread was fine, and so is this one. And a very nice example Ade, brilliant choice of subject, showing how DoF extends both in front of the focused point as well as behind it :thumbs: That was, if I may say, a bit of a failing on the other thread.

And, FWIW, I think it is both relevant and helpful to talk about the inevitable and direct consquencies of shooting at f/22, ie long shutter speeds and diffraction. Not to mention raised ISO and noise, tripods and IS if needs be. You just can't look at these things in isolation, because there are always knock-on effects, consequencies and choices, which is part and parcel of the skill. You need to know about them because they can be serious and might well ruin the whole point of the excercise.
 
I think its good people are making the effort to write the tutorial Ade :thumbs: good on you mate, i have a few in mind but might need a hand with them
 
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