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10/04/2011 04:49:41 PM · #1 |
| Guys, is there a way to get a focus stacked image with a lens that moves back and forth when focusing? My 90mm. Tamron focus like that. |
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10/04/2011 04:56:59 PM · #2 |
Yes (I'll assume you are talking about doing this for macro):
- Set the lens to manual focus and set the focus where you want to start (I'll use nearest point)
- Take first shot
- Move camera forward, take second shot
- Lather, rinse, repeat
The above is actually the preferred method for *all* lenses, because adjusting focus on the lens can cause changes in effective focal length and make the resulting images much harder to stack.
The best way to do this is with macro focusing rails, but it is possible to "fake it."
Message edited by author 2011-10-04 16:58:42.
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10/04/2011 05:01:44 PM · #3 |
| So you have to start far enough away and allow enough space around the subject to account for the changing composition? And keep the lens at the same angle? |
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10/04/2011 05:17:15 PM · #4 |
Originally posted by kirbic:
- Take first shot
- Move camera forward, take second shot
- Lather, rinse, repeat |
Actually, I read his question as asking if he can leave the camera in the same position and rely on the forward and backward movement of his lens as he changes focus. |
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10/04/2011 05:19:34 PM · #5 |
If you're wondering how you accomplish this without rails, here's a way-
Now, this all depends upon how your tripod head locks. It is possible with mine, which is an Acratech. Purchase a mountain plate that's for a big telephoto, like this one I use for my Bigma. Attach it to your camera, instead, perpendicular to the focal plane (the little lip at the end makes this pretty easy). Now, you can loosen the clamp a small amount and slide the plate forwards progressively. This one is 4", but there is also a 6" one they make, which gives you several inches of play forwards and back. It will work with all Arca-Swiss tripod heads. For other head types, it may be possible, but I'm not familiar with how they lock so can't really say.
Message edited by author 2011-10-04 17:20:05. |
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10/04/2011 05:27:08 PM · #6 |
Thank you :)
I guess I can't take the camera in the same position because the lens is moving, I know that.
More or less, I understood that with 90mm. Tamron it's possible to do focus stacked image but I don't know how I can do it moving the camera on a plate. The image doesn't become bigger or smaller?
I have a also a video camera tripod and maybe I could use it considering that it has a moving plate. At the beginning I could begin using that. |
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10/04/2011 05:48:00 PM · #7 |
| The relative size changes no matter what, if you refocus or move the whole thing. This is dealt with during the combining of the images and is not a serious issue. By moving the whole setup, the focal plane moves through the scene, but the focus distance remains unchanged. This is important, since the movements of elements can have effects on anything from bokeh to perspective as they move. It's also more accurate, but that's assuming you use a rail, not sliding the plate as I mentioned, so it may be a bit of a wash. That's as I've come to understand it, at any rate. |
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10/04/2011 06:47:36 PM · #8 |
I tried using CombineZM.
This is what I got:
First Image: 
Last image: 
Final Image: 
Is it ok? I know the right side has some problems (I needed one more shot) ;-) |
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10/04/2011 08:37:12 PM · #9 |
| Looks fine- I agree you needed another shot in there for the closest portion of the knurling on the ring. |
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10/05/2011 09:19:37 PM · #10 |
Sorry to hijack this thread, but under what editing rules is this possible? Advanced or Expert.
I can see how it would be possible under advanced, just like a HDR is. It is the same image in all shots. But just want to make sure. I have an idea for a shot but the challenge is Advanced editing.
thanks. |
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10/05/2011 09:24:36 PM · #11 |
Originally posted by sinistral_leo:
Sorry to hijack this thread, but under what editing rules is this possible? Advanced or Expert.
I can see how it would be possible under advanced, just like a HDR is. It is the same image in all shots. But just want to make sure. I have an idea for a shot but the challenge is Advanced editing.
thanks. |
Advanced. Per the advanced ruleset:
"The intent of allowing multiple captures is to enable such techniques as high dynamic range (HDR), noise reduction, increased DOF, etc., but not to permit a subject from one scene to be inserted into a different scene, nor is it intended to allow a subject to appear in multiple places within a scene."
(emphasis mine) |
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10/05/2011 09:26:23 PM · #12 |
Advanced Rules
Originally posted by Advanced Rules:
You may combine up to ten captures of the same basic scene. The intent of allowing multiple captures is to enable such techniques as high dynamic range (HDR), noise reduction, increased DOF, etc.... |
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10/05/2011 09:26:58 PM · #13 |
Originally posted by spiritualspatula:
Originally posted by sinistral_leo:
Sorry to hijack this thread, but under what editing rules is this possible? Advanced or Expert.
I can see how it would be possible under advanced, just like a HDR is. It is the same image in all shots. But just want to make sure. I have an idea for a shot but the challenge is Advanced editing.
thanks. |
Advanced. Per the advanced ruleset:
"The intent of allowing multiple captures is to enable such techniques as high dynamic range (HDR), noise reduction, increased DOF, etc., but not to permit a subject from one scene to be inserted into a different scene, nor is it intended to allow a subject to appear in multiple places within a scene."
(emphasis mine) |
Ahhh, silly me. Should have read it more carefully. Thank you. |
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