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Forum: Pentax Medium Format
04-26-2008, 03:09 PM
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The 6x7 format is much larger than 645, but you probably won't notice much difference in print quality between the two formats until you start making 11x14 or larger prints. Someone mentioned the widest rectilinear lens is a 50mm, which is incorrect. The widest is a 45mm, and it is an incredible lens. There are/were a couple of lenses available for higher flash sync, a 90mm and a 165mm. Both are very good optics, make sure you have read the operations manual before using them, as it is possible to damage the shutter fairly easily if you don't set the body shutter to the correct speed (1/8 second, IIRC).
If you are wanting to do landscapes, and aren't to worried about speed of use, a 4x5 field camera such as a Tachihara might be a better choice, as the camera and lenses will weigh a lot less. Film holders will take much of the weight advantage away.
There are no mirror slap issues with the 6x7. I did the old nickel on the screen test and sure enough, the nickel stays upright. Having said that, if you put the thing on a flimsy tripod such as a Manfrotto 055 or smaller, and then try to use a long, you can have well deserved vibration problems from the shutter.
You can see my little movie here:
http://www.pdmlpug.org/VIBRATION.MOV
Sorry about it being a Quicktime, it was shot with an Optio750
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