If this is your first visit, be sure to check out the FAQ by clicking the link above. You may have to register before you can post: click the register link above to proceed. To start viewing messages, select the forum that you want to visit from the selection below. |
|
|
|
Thread Tools | Display Modes |
#1
|
|||
|
|||
Question about weird DOF...
Can anyone tell me what the DOF issue is here?
http://www.pbase.com/image/62939916 Is this due to the angle of the shot? Why would the DOF in the foreground look like that? FWIW, the set up is a D70s, 27.5mm PK-13 - 55mm Micro Nikkor, SB-800 w/ Lumiquest Softbox off camera at 9:00 in the picture.... Any help is appreciated... Ben PS - No real processing was done; I'm more concerned with the blurry ring. |
#3
|
|||
|
|||
Question about weird DOF...
Joseph Meehan wrote: I don't see anything odd. What aperture were you using? Was there enough available light to create a blurred image due to motion? Aperture was relatively high, f/11 IIRC. At 1/320s there shouldn't, and isn't, any blur due to motion in that picture. As you can see, the closest wing is blurred due to DOF, but the other one is frozen by the shutter speed and flash. It's just that I've never seen DOF like that - a weird, perfect circle in the foreground... |
#4
|
|||
|
|||
Question about weird DOF...
|
#5
|
|||
|
|||
Question about weird DOF...
Annika1980 wrote: wrote: Can anyone tell me what the DOF issue is here? http://www.pbase.com/image/62939916 PS - No real processing was done; I'm more concerned with the blurry ring. Looks like just another piece of bark in the foreground, very close to the lens. Kind of a cool looking fly, though. This is more than likely the case, as he was tucked away in the bark creases, appearing occasionally. I had to snap quickly from wherever I could. Yeah, I'd never seen a fly like this - speckled wings that were moving constantly and the curious protrusion from the rear end... |
#6
|
|||
|
|||
Question about weird DOF...
wrote:
Can anyone tell me what the DOF issue is here? http://www.pbase.com/image/62939916 Is this due to the angle of the shot? Why would the DOF in the foreground look like that? Depth of field is of course on a "flat" plane parallel to the front of the lense. (It probably isn't actually flat though, but...) The body of the insect is where the plane of focus is. The bark where its far side legs are standing is at a greater distance, and therefore out of focus. The bark in front of the bug is at an equal distance, and is therefore in focus. The wings appear to be such that one of them is almost parallel to the lens, while the near one is pointing more or less at the lense, and is therefore extending out of the range of focus. It's just very difficult, without thinking about the depth of field, to look at a two dimensional image such as that and realize what the Z axis dimension is. The only key you have is the depth of field... It is interesting to keep in mind what "flat" means in terms of focus too. Most lenses are not actually "flat", but instead have sort of a curve much like the surface of the lense itself. The outer edges of the image will be in focus slight closer to the lense than the center. True macro lenses will probably be better corrected for flatness, and while not absolutely flat, the edges will be closer to the same plane as the center. -- Floyd L. Davidson http://www.apaflo.com/floyd_davidson Ukpeagvik (Barrow, Alaska) |
#7
|
|||
|
|||
Question about weird DOF...
It looks like a twig pointing at the lens and close enough to be OOF...
Guy wrote in message oups.com... Can anyone tell me what the DOF issue is here? http://www.pbase.com/image/62939916 Is this due to the angle of the shot? Why would the DOF in the foreground look like that? FWIW, the set up is a D70s, 27.5mm PK-13 - 55mm Micro Nikkor, SB-800 w/ Lumiquest Softbox off camera at 9:00 in the picture.... Any help is appreciated... Ben PS - No real processing was done; I'm more concerned with the blurry ring. |
#8
|
|||
|
|||
Question about weird DOF...
My thoughts as well.
Kevin Annika1980 wrote: wrote: Can anyone tell me what the DOF issue is here? http://www.pbase.com/image/62939916 PS - No real processing was done; I'm more concerned with the blurry ring. Looks like just another piece of bark in the foreground, very close to the lens. Kind of a cool looking fly, though. |
#9
|
|||
|
|||
Question about weird DOF...
wrote:
It's just that I've never seen DOF like that - a weird, perfect circle in the foreground... It isn't quite a perfect circle - there is actually a good deal of variation in the edges. My guess is there was some sort of large knot or other knobby protrustion in the wood, which protruded enough to be in front of the focus area, and that's what you're seeing. -- www.ericschreiber.com |
#10
|
|||
|
|||
Question about weird DOF...
--
It looks like a good use of depth of field to create an interesting photograph. The out of focus circle adds, not detracts, from the photo in my opinion. Bill in Lake Charles |
|
Thread Tools | |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
Question about Aperture priority and Shutter Priority | John Edwards | Digital Photography | 14 | January 5th 05 04:58 PM |
Question about Photo printers | John | Digital Photography | 35 | December 24th 04 02:30 AM |
Digital Camera Question | Art Salmons | Digital Photography | 11 | October 28th 04 05:10 AM |
question about cross-processing | the letter K | Film & Labs | 3 | February 4th 04 11:03 PM |
MF resolution question | Faisal Bhua | Film & Labs | 42 | December 17th 03 02:14 PM |