e6filmuser Offline Upload & Sell: Off
|
p.1 #8 · p.1 #8 · Venus Optics 15mm 1:1 Macro Lens Coming !!! | |
e6filmuser wrote:
Yes, Brian, a vertical shift of 6mm (shift lenses usually shift up to at least 11mm). This is the principal use of shift lenses, for architectural images, correcting converging verticals. They can do the same laterally, usually to a slightly smaller distance.
Shift is less potentially useful in macro than tilt, which can give a principal plane of focus not parallel to the sensor. I have a tilt adapter which I have occasionally used, most recently to combat internal reflections. I also have shift lenses (24mm and 35mm, non-macro).
Shift mechanisms are incompatible with other than manual, stopped-down apertures, even on the system cameras they were designed for.
Harold...Show more →
I forgot to say that shift or tilt needs a lens with a larger than standard image circle at the sensor, as these lenses, to a varying extent, use areas further from the centre than do other lenses. That is why I use my Schneider HM 90 rather than the HM 40 for tilt shots. The amount of tilt I used to eliminate the internal reflection with the 40 was tiny.
Harold
|