fran_ois_courtois Posted April 12, 2005 Share Posted April 12, 2005 Hello, this is my first post on this forum, so please be indulgent !My C220 with 80/2.8 systematically "front focusses" (focusses to apoint closer than the actual subject that appeared sharp in thefinder). It is very visible on portraits ... Is it possible to correctthis easily myself? Thank you Link to comment Share on other sites More sharing options...
mag_miksch Posted April 12, 2005 Share Posted April 12, 2005 only reason I can imagin is a problem with the waistlevelfinder or the screen, check if they are proper in place and there isnt a correction lens attached to the magnifying lens. Link to comment Share on other sites More sharing options...
skygzr Posted April 12, 2005 Share Posted April 12, 2005 I recall there are some small screws in the viewfinder assembly that can be used for adjustment. They are usually set at the factory and and are glued in place. I haven't seen one of these cameras in a while....is it possible to install the screen upside down? It sounds like the camera has been tampered with. It shouldn't need adjustment. Link to comment Share on other sites More sharing options...
kent_judiesch Posted April 12, 2005 Share Posted April 12, 2005 François, I had the same problem with mine when I bought it. Here's what I did to correct it: 1. I took the focussing screen off and lo and behold, it was not properly shimmed; someone had taken the screen off previously and the shims had fallen off of the screws which attach the screen to the body. I replaced the shims. 2. To confirm the focus (the hard part). I took a 6x6cm piece of perspex and covered one side in 'invisible' scotch tape (the satin textured stuff). This was a 'cheap focussing screen. I placed the camera on a tripod and placed a page of newspaper, well lit, on the wall about 30cm away from the camera. Everything was perfectly level and measured. I opened the back of the camera and placed the focussing screen onto the film plane. With all of this in place, I focussed the camera in the usual way and then, with a loupe, ensured that the image was in focus on my perspex focussing screen. 3. If everything is now focussed, great. If not, you might have to check the shims on the focussing screen again. Hope that this helps, Kent Link to comment Share on other sites More sharing options...
fran_ois_courtois Posted April 12, 2005 Author Share Posted April 12, 2005 Mag, what do you mean by "correction lens attached to the magnifying lens"?<p>Kevin, i do not think anything is "upside down", this camera has just been bought but is in pristine condition, probably never been used before. Sorry for my english, but what does "tampered" mean?<p>Kent, what is a "schims"? Is it a sort of spacer that uplift the focussing screen to adjust focus? Is it not risky to unscrew the focussing screen?<p>To ensure focus is ok on the perspex, surely you need to fire the shutter? I cannot do this while the back is open ... and if I could, do you use the bulb setting to open the aperture?<p>Anyway, thank you very much for helping me, I'm a newbie Link to comment Share on other sites More sharing options...
mag_miksch Posted April 12, 2005 Share Posted April 12, 2005 in your waist level finder you have a fold out magnifying loupe, to this maybe a diopter correction loupe is attached. Link to comment Share on other sites More sharing options...
mag_miksch Posted April 12, 2005 Share Posted April 12, 2005 http://www.macuserforums.com/webx?14@27.ffJHaLiCp70.2@.ee707e6 you can post your question here, there are Mamiya technicans Link to comment Share on other sites More sharing options...
enrico__ Posted April 12, 2005 Share Posted April 12, 2005 Check that both 'viewing lens' and 'taking lens' are aligned.. Link to comment Share on other sites More sharing options...
tim obrien Posted April 12, 2005 Share Posted April 12, 2005 I would first test it with another lens. The one you have may have been dropped, may have had the lens shimmed incorrectly when serviced. If the taking lens and the viewing lens are not focused to the same spot, miss focusing can occur. Assuming the different lens exhibits the same phenominum, I would make sure the hold down bail is holding the lensboard in the correct secured space. I have never seen it on an 80mm lens, but I have on a 180mm. The weight of the lens made the whole lens assembly just a bit loose. Finally do the pull the screen method and add (or subtract) shims. More an issue on the C33 and C330s as those screens are meant to be swapped, but someone could have been messing with your permanent C220 viewing screen. Or replaced it altogether with an inappropriate one. tim in san jose Link to comment Share on other sites More sharing options...
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now