« on: May 09, 2014, 01:08:07 PM »
Canon's TS lenses can be tilted and rotated (as well as shifted, three degrees of freedom). It would be a simple matter to adjust the focal plane such that you get the whole eye in focus without losing the face. These things are quite subtle as well...we aren't talking about the need to tilt 30° here. Fundamentally, ANY amount of tilt would give you control over the focal plane. Also, don't forget, you can still stop the lens down as well. If you need more literal DOF even with tilt, then there is nothing stopping you from doing what you did before with narrow apertures.
Having MORE capabilities is NEVEr useless. It can't be...it's more capabilities.
But the TS-E only tilt in one direction, no tilt and swing. While the rotating mount in nice it won't help in this situation IMO. Tilting and moving the plane of focus will only move the slice of sharp focus to different parts of the fly's eye/head and not bring all the head into sharp focus.
Well, first, in the case of the sample photo I shared, I absolutely do believe a TS Macro lens would allow me to get the whole head in focus. The entire actual head, front to back, would not literally be all within the depth of field, but again, that doesn't matter. All that matters is that the part of the fly's head that is visible is sharp and within the depth of field. It's a fly. The DOF doesn't have to be that thick to achieve that goal. Without T/S, you have to stop the lens down CONSIDERABLY in order to deepen the depth of field enough to encompass enough of the fly's head to make it all appear sharp, however it can never be as sharp at f/32 as it could be at f/11. With a TS lens, just a little bit of tilt and rotation will allow you to adjust the plane of focus such that you can maximize the potential an f/11 DOF has, and not need to stop down to f/32 (which will obliterate a lot of detail due to diffraction.)
More capabilities are more capabilities. It isn't going to magically make it so you can use f/2.8 for macro, but it will give you options you did not have before. It will allow you to utilize the DOF you have at less diffraction limited apertures more effectively. That's the entire point. That's what a bellows in old MF and LF view and field cameras were for, not really for "creative" focus, but to give you more options to maximize your use of the DOF you have at wider (and thus, less diffraction limited and therefor sharper) apertures.
It doesn't matter the degree of the additional capabilities. Having them at all, limited or extremely capable, is better than NOT having them. That's all my argument is.