DOF question
livefreenski
Registered Users Posts: 163 Major grins
on a shot this weekend i was trying to capture a rock skipping across a lake but it was impossible to have each puddle in focus including the airborne rock
I just had the lense that comes with the digital rebel... i tired various f-stop configs i just couldnt get this capture to work
what type of lense would I need to capture something like this because this stitition has arose a dozen times now and i like to make a purchase hahaha i just got my bonus
regards
-ty
I just had the lense that comes with the digital rebel... i tired various f-stop configs i just couldnt get this capture to work
what type of lense would I need to capture something like this because this stitition has arose a dozen times now and i like to make a purchase hahaha i just got my bonus
regards
-ty
0
Comments
can you give us an example shot? at f/8 it should have given you enough DOF to get all puddles in unless you were starting real low to the water
smugmug: www.StandOutphoto.smugmug.com
You may need to go hyperfocal.
I recently made a chart for myself, here's a copy:
AFAIK, it should do just fine for your DRebel.
For instance, if you shoot at 50mm, set your aperture to f/22. Chart gives you 5.9m, roughly 6m, i.e. 18ft. This means everything from 9ft to infinity would be in focus.
Note, that f/8 calls for 16m HF distance, i.e. 48ft, so your near DOF border will be at 24 ft, which may be too far...
Apertures as low as f/22 may call for higher ISO, though.
HTH
HTH[/quote]
yes that was the problem once i got the f-stop to the correct point the photo would be to dark. then and if i went above 1600+ with the ISO the photo would look ..... not so hot so i figure the wide angle would be easier?
ISO 1600+... Are you talking about 1800 or 3200?
Well, since you didn't post or pointed to any of your shots, as well as did not specify the distance, lighting, time of day, etc, it's rather hard to recommend any change in focal length. Naturally, shortening the focal length helps to increase DOF, but that's kinda trivial fact
Without you bringning more specifics I'm not sure if I (or anybody else) can help....
ISO: 800
Shutter:1/500S
Aperature: f4.0
Focal Length: 75mm
Well, Ty, I know this is not a "whipping post", but ... All this ruckus about spending $400 for a new lens - all for this?
- How about doing it in a broad daylight?
- How about taking multiple shots and stacking them, since a calm water usually provides for a seamless blending?
- How about throwing the stone further than a three year old, and thus gaining proper distance for the DOF?
The possibilities for the self-improvement are endless...As a side note, instead of throwing $400 for "a" lens, I would wholeheartedly recommend to spend $250 on an academic version of PS CS2, and the rest on photography, post-processing and color-correction books.
HTH
Hold the lens in landscape mode (long side up) and angle it so your skip goes from one corner of the frame, across the diagonal, to the other corner.
Try f11, maybe f16. Give yourself whatever ISO you need, in order to raise your shutter speed to about 1/200th or faster.
Prefocus on where you think the first skip will be, so you're not asking your autofocus to do too much work.
Once you've nailed a few shots with these techniques, start slowing down your shutter (and lowering your ISO to compensate) so you can get some motion blur on your rock.
No need to spend a few hundred dollars on a lens.
That Nik, he's a nasty one, eh?
Catapultam habeo. Nisi pecuniam omnem mihi dabis, ad caput tuum saxum immane mittam
http://www.mcneel.com/users/jb/foghorn/ill_shut_up.au
My point exactly
If you absolutely have to have higher ISO's I recommend getting the DxO software. This will cost you less than a new lens and will make your kit lens output look great plus buy you a couple of stops with its noise reduction.
Erich