Steve Seitz
2-Jul-2000, 15:42
I have just lucked?? onto a Burke and James Orbit monorail 4x5 as a first stab a t LF work and have run into a focusing/resolution problem. I have only used the camera once, but am stumped as to how to address this problem so I can move ahea d with learning to make it a practical part of my amateur work.
This is an all-metal camera (which I understand to be rare for B&J cameras) and is likely a mid-60's model. I got it along with a Polaroid 500 back in decent sh ape - in fact the whole camera is in fairly good condition. It has a Synchro Com pur shutter (which sticks a lot at slow speeds, and is a bit spotty at higher sp eeds - needs cleaning and adjustment)with a Schneider Kreuznach Xenar 150 mm, f4 .5 lens which seems flawless.
The problem: poor focus using the polaroid back with 100 iso B&W film, which is the only film I've tried so far. Focus is extremely soft below f16 and at 4.5 is unusable. At f22 and f32 it is decent but not great - at least not as great as I'm led to believe LF should be or as good as I've seen published.
My perplexity comes from the fact that on the ground glass, at any aperture, foc us is excellent, using an 8x loupe, but when I put in the polaroid back and shoo t I get very poor results. I finally noticed that the ground glass frame doesn't seat well (maybe as much as 1/16th in. off the camera body) and you have to fut z-around with it to get it close to firmly seated. Even then, one corner is 1/32 or so off the camera. Correcting this seems to have helped some, but still at o pen apertures very fuzzy.
Why would it focus correctly on the glass and not on the film? Could the Polaroi d back not be suited to the B&J body? Am I putting the film packet in wrong? Am I focusing wrong? Am I expecting too much? Is the Polaroid film simply very grai ny even at 100 iso?
I would like to be able to do outdoor portraits (I normally shoot landscapes etc .), but having to use only the higher apertures means I can't fuzz-out the backg rounds enough to get a good head shot. It also means if I'm shooting close folia ge and there is a breeze I get blurring because I have to shoot at such slow spe eds for the high aperture.
Am I doing something wrong, overlooking something, or is there a mechanical prob lem?
Help!!
This is an all-metal camera (which I understand to be rare for B&J cameras) and is likely a mid-60's model. I got it along with a Polaroid 500 back in decent sh ape - in fact the whole camera is in fairly good condition. It has a Synchro Com pur shutter (which sticks a lot at slow speeds, and is a bit spotty at higher sp eeds - needs cleaning and adjustment)with a Schneider Kreuznach Xenar 150 mm, f4 .5 lens which seems flawless.
The problem: poor focus using the polaroid back with 100 iso B&W film, which is the only film I've tried so far. Focus is extremely soft below f16 and at 4.5 is unusable. At f22 and f32 it is decent but not great - at least not as great as I'm led to believe LF should be or as good as I've seen published.
My perplexity comes from the fact that on the ground glass, at any aperture, foc us is excellent, using an 8x loupe, but when I put in the polaroid back and shoo t I get very poor results. I finally noticed that the ground glass frame doesn't seat well (maybe as much as 1/16th in. off the camera body) and you have to fut z-around with it to get it close to firmly seated. Even then, one corner is 1/32 or so off the camera. Correcting this seems to have helped some, but still at o pen apertures very fuzzy.
Why would it focus correctly on the glass and not on the film? Could the Polaroi d back not be suited to the B&J body? Am I putting the film packet in wrong? Am I focusing wrong? Am I expecting too much? Is the Polaroid film simply very grai ny even at 100 iso?
I would like to be able to do outdoor portraits (I normally shoot landscapes etc .), but having to use only the higher apertures means I can't fuzz-out the backg rounds enough to get a good head shot. It also means if I'm shooting close folia ge and there is a breeze I get blurring because I have to shoot at such slow spe eds for the high aperture.
Am I doing something wrong, overlooking something, or is there a mechanical prob lem?
Help!!