DOF Challenge

[Tommyrocket1]

[IMG][/IMG]

[Dusty]

Not sure what you would like as a response to your image.

It says DOF Challenge, is it you want to have somebody comment on the DOF in this image?

It's 13:03 and you have just changed the image?

[Tommyrocket1]

Hi Dusty, I think I was emphasizing it was my challenge, or a challenge for my technical skills, sorry for confusion

[MrB]

The colour balance doesn't look right to me - a sort of orange bias throughout - but that might be your intention.

Philip

[Tommyrocket1]

Yes Philip I agree,slightly out but difficult to balance, the subject matter, distance and lighting gave an odd result, thank you for CC

[MrB]

If you want to experiment, it should be relatively easy and fun just to play around with the white balance settings in your software.

E.g. -



Philip

[Tommyrocket1]

Hi Philip, nice update, thank you.

[Inkanyezi]

The challenge can be seen in different ways. I once thought that the kind of "depth" we perceive when looking at a photographic image, should always be due to perspective, although the more artificial depth perceived by out of focus areas seems paramount to "pop" and viewing depth per se. However in real life, distant objects are never out of focus for our vision, this occurs only when looking at objects that are very close.

The Tabasco bottle and the peppers are not large, ant it makes sense to have large portions of the image out of focus, although also other approaches are possible. I saw it as a real challenge to get everything into focus when taking a closeup of small objects, but image-wise, it won't pop, just because everything is sharp, or at least near sharp. When tilting the lens to achieve sharpness all over DOF is very shallow vertically at close distance and becomes wider (vertically) farther away.. This challenges our vision for close objects, where we expect the distant objects not to fall within focus.

So I see it as a challenge to combine the best of two worlds; how to achieve distant bokeh, while maintaining sharpness over large part of the image area at closer distances.

[Tommyrocket1]

Hi Urban Domeij, a great take on what I was after, thanks for contribution. Regards Mick

[Inkanyezi]

The technique used is lens tilt.

I have used a Pentacon 29 mm lens on the OM-D with a tilt adapter, tilted seven degrees forward, to stretch out sharpness along the tabletop according to the Scheimpflug principle.

Then I stopped down to f/22 in order to get both the bamboo mat and the braille on top of the first lid of the medicine dispenser sharp. Otherwise the braille would not have become sufficiently sharp, as vertical DOF when tilting is very shallow at a close distance. Some of the optimal sharpness is lost closing it down so much, due to diffraction, but there are always trade-offs.