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In Reply to: digital backs for classic slr cameras posted by nigelbetts on February 04, 2004 at 03:48:02:
thankyou to those whom threw in some answers here,
i don't get the connection point though --as surely all thats needed is a chip that slips in & acts like film(either you get the correct exposure via the mechanics & settings of the shutter/exposure settings or you don't.
the chip controller would be set up just as if it were a certain ASA rated film & the resulting exposures sent to a storage module.the actual exposures would be controlled by the slr(with some trail & error learning curve).
Am i over simplifying this??.
methinks --this will be possible once the size of the sensors/chips are made larger & upgrades become available for digital models--even the new today(fixed) dig slrs will be obselete in a very few years, when they are designed with upgrades in mind--i feel that will be when we have truely arrived. simultaneously i expect gizmos to appear for inserting into a classic film slr.
regards nigel.
Follow Ups:
There are several problems. First is the the rear nodal point of the lens to the image plane. Film is very thin, solid-state imaging devices are thick. The image plane is really the surface of the imgager - but, there is usually a piece of glass over the top of the imager (IR filter). This means the imager now sticks out beyond where the film plane is, and can interfere with the rear element on some lenses, and in some cameras interfere with the focal plane shutter. If you move the imager back to get the cover glass out of the way - then the imager surface is no longer at the focal point.The entire assembly has to be engineered to get the imager at the correct position, keeping it out of the way of the shutter and the rear lens elements. That's why, although many digital SLRs look like a converted film camera, if you examined them closely and did some measurements of internal parts, and distances, you would find out the shutters are not in the same position as their "look-alike" film counterpart.
If you are thinking of a film type cartridge that would slip into the camera in place of film, look on the Internet for a company called "Silicon Film," - which has never gone anywhere in the past 5 years because it's apparently a solution in search of a problem. Or, it really doesn't work as advertised - you'll have to make your own mind up about that.
It's a great idea - I wish the conversion was as easy as just sticking in a solid-state film substitute. Unfortunately it's not that easy as the whole camera has to work as an imaging system. Rumours (don't you love them?) have Nikon introducing the F-6 at some future date with interchangeable film & digital backs like the Leica R-8 & R-9. No reason they can't do it - Leica has proven you can do it.
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