I am using a digital rebel xt and a 75-200 mm lens. I want the sharpest picture possible using a/v priority. I can adjust all other parameters such as iso speed etc. Is there an ideal setting for taking action shots using the a/v priority in this manner?
2007-02-03 12:06:48 · 8 answers · asked by Hawaiian Nut 3 in Arts & Humanities ➔ Visual Arts ➔ Photography
A medium F stop like F/8 or F/11 is the sharpest optically. Be sure to keep you shutter speed fast so you can take advantage of that!
2007-02-03 15:02:43 · answer #1 · answered by Mere Mortal 7 · 4⤊ 0⤋
Mere Mort is the first correct answer. Almost always, the middle aperture range will be the sharpest on a given lens.
Note: Sharpness is not the same as depth of field. The smaller apertures have more depth of field, but lenses perform best somewhere in the middle, not on either end.
However, taking action pictures, you may have to sacrifice absolute sharpness to get correct exposure.
2007-02-03 16:20:23 · answer #2 · answered by Ara57 7 · 2⤊ 0⤋
Seriously guys, where are you getting your information from? If you dont know an answer, dont assume and then pass it off as correct. Mere Mortal's answer is the only correct answer. Usually around f8 - f11 gives the sharpest focus. Someone gave the answer that using the apeture wide open will require a longer shutter speed. That saddens me to think someone believes that. I suggest you all pick up some photography magazines and start reading.
2007-02-03 23:03:09 · answer #3 · answered by Piano Man 4 · 1⤊ 0⤋
use the largest aperture you can (smallest number). So this would mean a f/2.8 or f/3 something. It'll give you the fastest shutter speed possible without having to really bump your iso. I recently shot a hockey game with 2 different lenses to test the difference a change in the f/stop gave and it was remarkable. With the rebel XT kit lens (f/5-f/5.6) i got only like 1/50-1/80 of a second. With the promaster f/2.8 lens I got shutter speeds upwards of 1/500 of a second. So to take sports pics, throw your f/stop wide open. This means a f/stop of 2.8 or 3 to get really sharp pics.
If you want examples of the difference, email me.
2007-02-03 14:28:20 · answer #4 · answered by listy07 2 · 0⤊ 2⤋
the largest number (f-stop) on your lens is your smallest aperture setting. but, if you have it on aperture priorty mode your camera makes you lock it onto your smallest aperture. the problem with what you want is that your telling your camera you want the most depth of field from where your starting your focus at. that doesnt usually give you good shutter speed which is what you need for action shots.
if you truly need the greatest depth of field and stop action and you still want to use aperture priorty mode then you have to watch the shutter speed while your taking the picture. most of the newer slr's today let you rotate thru the combo's of f-stop and shutter speed in aperture priorty mode and shutter priorty mode. so use that feature to max out your depth of field but still keeping the shutter speed in a decent range for action.
also as you noted a higher speed film will help because you won't need as much light to achieve a higher a f-stop and action. but it will affect your grain if you go with very high speed films. you should be fine with an 800 iso/asa film. unless grain is an effect you like.
as far as what f-stop gives what depth of field i've found that each of my lenses is a little different. with my medium format i used an 80mm lens and like f8 for portraits. and 5.6 with my slr and my 28-105. i would recomend f16 or higher for good depth of field though. the key and my suggestion would be to shoot a roll of film and go through the different f-stops with the lens you will be using. thats what i have always done. anyone can tell you what works and doesn't but a picture doesnt lie. just make sure you keep track of what you've done and realize that canon rewinds as you shoot so you will be starting at the end of the roll so make sure you use a lab that prints the frame numbers on your pics.
as a side note you don't really need a super high shutter speed to stop action. you could probably get away with 1/125 for sports and people. it really just depends on what exactly your shooting.
2007-02-03 15:47:06 · answer #5 · answered by camerageeky 2 · 0⤊ 2⤋
Smallest aperture gives the sharpest image but requires a longer exposure time. It is a trade off. Fast speed or sharp image.
2007-02-03 12:13:56 · answer #6 · answered by Barkley Hound 7 · 0⤊ 2⤋
comparable as maximum lenses - in the variety around a million-2 stops down from max. to f/8 or f/11 yet sharpness is a controversy of opinion and judgement - all those 3 are extraordinarily sharp extensive open!
2016-10-01 09:28:32 · answer #7 · answered by Anonymous · 0⤊ 0⤋
the smallest aperture you have...focus well and use a tripod
2007-02-03 13:26:18 · answer #8 · answered by doubt133 2 · 0⤊ 2⤋