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12/26/2005 05:05:22 AM · #1 |
Hey i was playing around today with my camera,(nikon d70s) i did everything right i think. But i can't seem to be able to get focus on the hole car in every pic i took it was only focused in one spot i want to focus on the hole car. Probably easy to do but i can't figure it out. i have a 17-70mm lens and 70-300mm lens. Heres the pics.
//img504.imageshack.us/img504/8550/dsc00128sv.jpg
//img523.imageshack.us/img523/8776/dsc00136qd.jpg
//img387.imageshack.us/img387/5641/dsc00144ao.jpg
//img453.imageshack.us/img453/4936/dsc00175bj.jpg
//img392.imageshack.us/img392/3280/dsc00158fv.jpg
Message edited by ClubJuggle - Changed large images to links. |
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12/26/2005 05:08:10 AM · #2 |
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12/26/2005 05:13:13 AM · #3 |
Originally posted by TechnoShroom:
Stop down more |
=higher F#
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12/26/2005 05:15:14 AM · #4 |
Originally posted by faidoi:
Originally posted by TechnoShroom:
Stop down more |
=higher F# |
what u mean f# |
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12/26/2005 05:29:28 AM · #5 |
| I think it looks quite cool as it is. Like they said if you want more depth of field then increase your F value (which is decreasing your aperture size) |
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12/26/2005 05:40:07 AM · #6 |
| Trav - sent you a PM look in your e-mail for it... |
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12/26/2005 06:04:58 AM · #7 |
| thanks i will play around with it tomorrow |
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12/26/2005 12:31:36 PM · #8 |
Originally posted by Trav:
Originally posted by faidoi:
Originally posted by TechnoShroom:
Stop down more |
=higher F# |
what u mean f# |
If you were shooting at 5.8, change aperture to 8.0 or 11.0 |
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12/26/2005 12:35:57 PM · #9 |
| yeah try F11 or F16 or something and way more will be in focus. |
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12/26/2005 12:38:54 PM · #10 |
Originally posted by alexsaberi:
I think it looks quite cool as it is. Like they said if you want more depth of field then increase your F value (which is decreasing your aperture size) |
I agree. The back 1/2 out of focus in the 2nd pic looks kinda cool. Would look pretty cool if you moved in closer and kept it the way it is....IMO.
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12/26/2005 12:46:05 PM · #11 |
| Using the shortest focal length (wide angle) and the smallest aperture (highest f#) will yield the maximum DOF. So set the lens at 17mm and f/16, in your case that will be the best possible DOF with your available hardware. |
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12/26/2005 01:42:31 PM · #12 |
These shots are "close-up" shots, and DOF on close-ups is a very critical part of the photographic equation. People are correct in saying that the more you stop down, the more DOF you get. This means, of course, that you will almost certainly have to use a tripod for these shots, as the more you stop down the longer the shutter speed will have to be. It's not, however, true that you will get more DOF by using a wider angle in this sort of shot. If you zoom out to a wider angle while keeping the camera position the same (i.e. include more BG in the shot) then you will have more DOF (not a lot, but some) but if you move the camera in to maintain a consistent framing on the trcuk model the DOF will be just as shallow. It's a function of the reproduction ratio. The closer in you focus with a given lens the less DOF you have, and with a wider-angle lens you have to move in closer and focus closer, so it balances out precisely.
Here's something else about DOF: it extends out along the axis of the lens. So if the subject is at a 45-degree andle to the lens axis, you need to stop down further than if the subject is at right angles to the lens axis, because the subject itself extends "deeper" within the image, see?
As a rule-of-thumb, your DOF extends 1/3 in front of and 2/3 behind the actual point of focus. So, for example, if you focus on a point 12 inches from the camera and at your chosen f/stop there will be 3 inches of DOF, then your zone of focus will be from 11 inches to 14 inches. If you stop down enough to get 6 inches of DOF when focused at 12 inches, your zone of focus will extend from 10 inches to 16 inches.
So, in these examples, there's one where you focused on the grille of the truck, and this was a mistake; fully 1/3 of your zone of focus extends in front of the truck, and it's all wasted, there's nothing there to BE in focus, see what I mean?
When I'm doing serious close-up work I set up the camera on a tripod and actually measure the distances to the nearest and farthest points I want to be in focus. I then divide that range by 3, and place a focus marker that distance "into" the image and do my focusing on that, manually, then remove the marker and shoot away at various f-stops and pick the one that works best.
This is the short version on how to deal with DOF issues. They're nice shots, btw, except for the focus issues.
Robt. |
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12/26/2005 06:10:45 PM · #13 |
Originally posted by bear_music:
Here's something else about DOF: it extends out along the axis of the lens. So if the subject is at a 45-degree andle to the lens axis, you need to stop down further than if the subject is at right angles to the lens axis, because the subject itself extends "deeper" within the image, see?
As a rule-of-thumb, your DOF extends 1/3 in front of and 2/3 behind the actual point of focus. So, for example, if you focus on a point 12 inches from the camera and at your chosen f/stop there will be 3 inches of DOF, then your zone of focus will be from 11 inches to 14 inches. If you stop down enough to get 6 inches of DOF when focused at 12 inches, your zone of focus will extend from 10 inches to 16 inches.
So, in these examples, there's one where you focused on the grille of the truck, and this was a mistake; fully 1/3 of your zone of focus extends in front of the truck, and it's all wasted, there's nothing there to BE in focus, see what I mean?
Robt. |
Is this on a flat plane, or a curved one? Or is the difference so trivial it doesn't matter except on lenses that are f/1.0 and lower? |
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12/26/2005 06:35:49 PM · #14 |
Originally posted by hankk:
Originally posted by bear_music:
Here's something else about DOF: it extends out along the axis of the lens. So if the subject is at a 45-degree andle to the lens axis, you need to stop down further than if the subject is at right angles to the lens axis, because the subject itself extends "deeper" within the image, see?
As a rule-of-thumb, your DOF extends 1/3 in front of and 2/3 behind the actual point of focus. So, for example, if you focus on a point 12 inches from the camera and at your chosen f/stop there will be 3 inches of DOF, then your zone of focus will be from 11 inches to 14 inches. If you stop down enough to get 6 inches of DOF when focused at 12 inches, your zone of focus will extend from 10 inches to 16 inches.
So, in these examples, there's one where you focused on the grille of the truck, and this was a mistake; fully 1/3 of your zone of focus extends in front of the truck, and it's all wasted, there's nothing there to BE in focus, see what I mean?
Robt. |
Is this on a flat plane, or a curved one? Or is the difference so trivial it doesn't matter except on lenses that are f/1.0 and lower? |
Most lenses have an approximately flat field... some more flat than others, but most flat enough that you'd have a hard time documenting that it's not flat.
BTW, it's not always 1/3 front, 2/3 rear... here is a neat tool that can help you to understand what DoF you'll get at a particular combination of focal length, aperture and distance, with a given camera.
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