Question about Pentax 645N Medium Format Camera
I was able to see through the viewfinder fine after recieving it in the mail and then after taking off the film carrier and replacing it, the viewfinder went very dark. I didn't change anything. Is there any way that I can fix this myself and I'm just making a silly mistake? The eye piece is also very loose. Thanks!
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Posted on Jan 02, 2017
SOURCE: Pentax SF1
This model has a gear train from the motor to the advance sprocket. The gears are plastic and prone to strip. Try E-Bay for a reasonable replacement and keep this one for parts. There are no new parts available.
Posted on Dec 08, 2008
it could be the rubber bumper next to the fresnel lens has become sticky. very gently ( after removing lens ) try to bring mirror down without forcing it. it should release easily.
if not, rotate the select knob off auto. open film door and check that the shutter is fully deployed, shutters should not be overlapping.
remove screws from bottom cover and remove cover, keep camera up side down so that re-wind button stays put. there is a locking lever under the take up spool ( gray ) . with a pin move lever toward film door and bring advance lever fully to the right , then let it go so it returns quickly.
the shutter should have fired. if not the camera will need to be repaired. get an estimate first as there are no new parts available.
Posted on Dec 27, 2008
Common fault due to perished rubber parts. Can be usually be repaired, but do not try to force the camera, that may cause damage which can not.
Go to http:/www.mypentax.com for information on how to service this yourself. The author can also advise by mail, and can service these cameras too.
Posted on Jan 21, 2009
Sounds like the pressure plate for the viewfinder lens has dropped in front of the lens. If the viewfinder surround is craked this is very likley.
To learn how to remove the top of these cameras and other Pentax's there is a camera repair website where you are shown how to do this. Just click the link.
Posted on Jan 21, 2009
There could be a number of causes.
First make sure that the replacement batteries are up to it. Ie one's marketed for camera use. Others often cannot supply the current required by the motors. (Electric motors require most current just as they start, and so it may not do anthyhing at all.) Then check the battery contacts are clean. Much the same reason applies, dirty contacts cam prevent the batteries from supplying enough current.
One more simple possibility is that it does not know the battery door is closed. This may be detected by a protrusion in the film door edge operating a contact in the loctaing groove, or contacts in the door latch. There may be more than one!
It is also possible that the camera is detecting an impossible film. DX coded film uses the contacts inside the film chamber to read the film speed from unpainted sections of the film cassette. It is just possible that a dirty contact or a scratch in the paint is telling the camera that the film is a speed it cannot handle, or is just confusing it with a nonesense code!
Outside these there are a number of possibilites which will require internal investigation. You can try these camera repair pages for tips on repairing your own camera.
Posted on Jan 23, 2009
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