Thanks for the replies.
I do so called bokeh panoramas. I catch a normal small view with a lot of images, because then I can go very close to the subject, getting a much more shallow depth of field than covering the whole scene with just one image. ( in my example there are 60 85mm 1.8 images stitched
http://www.openphotographyforums.com/forums/showthread.php?t=19413 ).
Hi Per,
Yes, I got that from your initial message. So I assumed that you would be stitching, which is why I didn't compensate for the output size difference of a single image. But I didn't know to what size you wanted to stitch.
The result does not add more blur than a tele lens but makes the image look like a wideangle with a shallow depth of field.
Correct, one can stitch for the angle of view, and when using a relatively long focal length the DOF will be very shallow. The confusing bit in your original question is the 35mm, which isn't a long focal length, so I wasn't exactly sure what scenario you were planning for.
Its usually called the Brenizer method, and there is even a calculator to get what lens and aperture that would be needed to get an image with that look. Here is a more extreme wide angle look, taken with the same 85mm at 1.8 with my Canon 5d II.
Yes, if you stitch enough of those, you'll create a virtual large sensor image, but with an insanely shallow DOF, shallower that is possible with existing optics (not to mention the weight of such a wide aperture lens) for such a "large format camera".
But if you stitch enough images, you can use the same aperture as one would need on the large format, for the same DOF. Only if you want a shallower DOF, or stitch to a smaller virtual sensor, then you would shoot pano tiles with a wider aperture. So you can use any DOF calculator, as long as you plug in the numbers for the virtual/large sensor size. Strictly speaking, the COC parameter one needs to use is a function of the output size and the viewing distance (and the required resolution at that size/distance).
Cheers,
Bart