Originally posted by Kunzite Sorry... there were some rust points so I decided to clean them and repaint the bridge before giving you the title. Unfortunately I'm out of paint, so please, do send more money
I'm afraid I have to ask
you to
prove that
it can be done, instead of endlessly attempt to prove you that it can't - for every idea you (or someone else) might have
Oh, great. More conditions to satisfy in order to make it work.
In fact it's:
- having to use
a fixed mirror (which
will steal light from the imaging sensor, unless they manage to implement the variable transmission mirror idea).
- the 'pellicle' mirror might introduce defects in the resulting image (IIRC Sony SLTs had such issues).
- the fixed mirror frame would introduce mechanical vignetting, and a resign where you could easily remove the mirror (for cleaning the sensor) requires such a frame. And it puts restrictions on the mirror's size.
- no secondary mirror to send light to a dedicated AF system, which means
no dedicated AF system. Bye-bye excellent low-light AF capabilities.
- viewfinder prism and everything around it moved forward, viewfinder optics extended
And it still won't be enough.
The camera could offer this feature in live view only with the mirror up. The camera would have to be on a tripod anyway. I don't see any of the issues you mention being insurmountable.
- Regarding the fixed mirror, they have a patent for that, which is different from the Sony implementation. Whether it is ready for introduction is another question, but it could be. I very much doubt they would go forward if it adversely impacted image quality. Note that it would have other benefits, like reducing mirror shock - a problem that makes it difficult to reach the potential of high-resolution sensors in some circumstances.
- The vignetting issue could be solved if the mirror were made big enough for whatever crop of the 645 lenses they can manage with the SR system. It doesn't have to be the whole frame to be useful.
- Many sensors have AF included now. Pentax AF is not generally perceived as being very good anyway, so they have less to lose from starting from the ground up with a sensor-based system. The other advantage of sensor-based AF is that is more accurate than even the best off-sensor systems, and that is becoming more important with high megapixel sensors. DPR keeps pointing that out and they are not the only ones.
- The VF on the mock-up of the Pentax FF does indeed look more prominent than other cameras. It could be that that there are differences to the mirror box area and VF itself.
- If using 645 lenses is indeed a major feature on this camera, it would make sense for Ricoh to make a new WR version of the adapter, so it would be "new".
I don't see anything unreasonable about the specs shown. Pentax and Ricoh have a history of using the sensor shift for interesting functions, and this seems in line with that history.
My own crazy idea, I was reading Ming Thein's article about tilt-shift lenses.
Tilt shift 101 ? Ming Thein | Photographer Would it be possible for Ricoh to create a tilt-shift adapter to use 645 lenses on the FF? Perhaps it would require more space than the adapter would allow. The secondary question is whether it would be possible to create K-mount tilt-shift variants of existing 645 primes.