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Simple, Bob. You have no DOF because:Your zoom lens is in the telephoto range.Low light = wide aperture/slow shutter speed.You are too impatient to use a tripod.And you haven't adjusted the camera diopter so you can actually see what you are doing.You're welcome!
I mean the ones where I grab the camera, select [AUTO], and snap a pic.
In audio terms that's called "Bose."
Couldn't resist yanking your chain, Bro! It's not the lens, it's physics (which I never took in school, BTW).Any time you get in close on a subject, hole saw, flower, whatever, small focusing errors become very apparent. On a landscape image you could miss the focus point by 50 yards and not notice, but in close ups a 1/4" error can make all the difference in the world. What's more, low-light shooting exacerbates the problem because the lens aperture is wide open or nearly so, which further reduces your DOF. Add that to shooting very close subjects and you have a real challenge no matter what the shooter's skill level. But the camera does "warn" you with the information in the viewfinder.DSLRs display the shutter speed and aperture settings. When you are shooting close a 3.5 or 5.6 f-stop is not your friend. You need to be in the 11, 16, or 22 aperture if at all possible. That will force the shutter speed to slow way down (as shown in the viewfinder), hence the need for a tripod. You could run the ISO way up but that's only a partial solution that results in a noticeable increase in digital noise. Lastly, think of your plain of focus. DOF is improved/easier when the subject is 100% parallel to the lens and camera sensor. The surface of the hole saw is not parallel so it would be extremely difficult to get all of the image in focus. There are some tilt-shift lenses that could do what the old-fashioned wood-and-bellows view cameras can do, but AFAIK you lose all auto controls with those lenses. As well as a LOT of cash... Some of the better shooters (bside, Pete, Guy13, or Jon L) could weigh in on these comments, but I think it's pretty accurate.Enjoy the weekend, Master Chef Bob, and think of those for whom it is named. I'll be in STL tomorrow and hope to get to Jefferson Barracks Nat'l Cemetery.
the same with a woman, to make her happy it takes time. Guy 13