No, the line on the balls is definitely on the negative.As it is only two frames can we take it that the difference shows up with either the naked eye or a loupe on the neg of the two balls i.e. it is not a scanning artefact?
pentaxuser
I've never had it serviced tbh.I would guess the shutter is acting up. When was it last serviced?
Really sorry, but not a clue what that means.Just to be sure, does the shutter move across the short side of the format size?
Ah, have already phoned them. Ian was very helpful in suggesting what could be the the problem but told me they don't really deal with my camera model.The best service center I know of are Newton and Ellis in Liverpool, used them a lot over the years and never a problem, and they are nice people to deal with,
newtonellis.com
Really sorry, but not a clue what that means.
Ah, ok, get it now, but afraid I don't know which direction the shutter travels.The fault seems due to a focal plane shutter, suddenly from about half way exposing longer. To give more evidence on this you were asked whether the the shutter is moving in the direction of the short image sides (thus vertically at 35mm full frame, which is typical for fast shutters).
I've just done that, taken the lens and film back off and fired the shutter at various speeds. It seems to fire ok, but at anything shorter than a second or two it's so quick that I can't really tell what's happening, other than when holding it facing the light it opens and closes. At the longer speeds you can see the black curtain opening, stay open, then shutting, but at quicker speeds the curtain doesn't seem to open at all, though it obviously must be doing so because you can see through it as the shutter fires.can you not open the back and trip the shutter- see it in operation?
View attachment 222312 View attachment 222313
Not so noticeable in the first image (the line's horizontal and is just above the 2 arched windows on the left if that helps) but definitely noticeable in the second one. These were the only 2 frames affected on the roll and weren't consecutive frames, so has anyone any idea what caused it please? Really hoping it's not a terminal problem with my camera (Pentax 645NII).
2. Verschluss Vorhang ?The fault seems due to a focal plane shutter, suddenly from about half way exposing longer (resp. shorter). To give more evidence on this you were asked whether the the shutter is moving in the direction of the short image sides (thus vertically at 35mm full frame, which is typical for fast shutters).
Vertically is correct - looking at pic. # 2 = shutter vertically frame horizontally (4,5 x 6)!!According to pentax the shutter runs vertically:
"Electronically controlled vertical-run cloth focal-plane shutter"
How a vertical shutter would make a horizontal line (with a hard edge like that) I don't know.
I've just done that, taken the lens and film back off and fired the shutter at various speeds. It seems to fire ok, but at anything shorter than a second or two it's so quick that I can't really tell what's happening, other than when holding it facing the light it opens and closes. At the longer speeds you can see the black curtain opening, stay open, then shutting, but at quicker speeds the curtain doesn't seem to open at all, though it obviously must be doing so because you can see through it as the shutter fires.
It depends which orientation the camera's in for each shot; for my first example it was in landscape, the second one in portrait.According to pentax the shutter runs vertically:
"Electronically controlled vertical-run cloth focal-plane shutter"
How a vertical shutter would make a horizontal line (with a hard edge like that) I don't know.
According to pentax the shutter runs vertically:
"Electronically controlled vertical-run cloth focal-plane shutter"
How a vertical shutter would make a horizontal line (with a hard edge like that) I don't know.
It depends which orientation the camera's in for each shot; for my first example it was in landscape, the second one in portrait.
Electronically controlled FPS use relays and electronic timing circuits to determine the speeds. The shutter still runs on spools with spring tension applied.It's something that's not uncommon with mechanical focal plane shutters, but you've got an electronic shutter here, so I'm not sure how easy it is to fix.
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