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).
What's gone wrong?
-
A
- Thread starter Paul Manuell
- Start date
Recent Classifieds
-
For Sale Kodak Ektapan 4x5 - 4x 100 Sheets
- Started by 0x001688936CA08
-
Sold Fujichrome Provia 4x5 - 1x 20 sheets - Expired 07/2024.
- Started by 0x001688936CA08
-
For Sale Speedotron 810 Power Supply with Cord
- Started by spoolman
-
Want to Buy CLA'd Mamiya 6
- Started by RoboRepublic
-
For Sale Pentax 67: Two Bodies with Five Lenses and other Accessories
- Started by RitchieLB
Forum statistics
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).
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
pentaxuser
No, the line on the balls is definitely on the negative.
MattKing
Moderator
I would guess the shutter is acting up. When was it last serviced?
I've never had it serviced tbh.
Can anyone recommend a good service centre in the UK please?
Just to be sure, does the shutter move across the short side of the format size?
Really sorry, but not a clue what that means.
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
newtonellis.com
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 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).
Last edited:
can you not open the back and trip the shutter- see it in operation?
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.
Have to make a correction to my initial post - the 2 photos ARE consecutive frames after all, but 3 weeks apart. The first one - the one of the Post Office - was the 4th of a sequence of near identical shots, all taken within a few minutes of each other to ensure a 'clean' shot with no people or moving vehicles in. Exposure times and apertures were identical in all 4 shots, but the only problematic one was the one shown in my op, with the 2nd example - the one of the 2 stones - being the next in sequence on the roll but taken 3 weeks later. All shots on the film after that show no problem at all. So in a nutshell, the only frames that had this problem were numbers 4 and 5 on the film.
- Joined
- Mar 16, 2012
- Messages
- 3,398
- Format
- Medium Format
Paul I remember simular issue with Canon 5D mark III in Studio! (~ 7years ago)!
It is the shutter ! (guess each 35mm camera shutter with titan lamella also your 645 Pentax is working the same)!
We had the problem that at the same line your example is showing ~ 1/3 of the frame a border
was dividing the picture!
The assistance who shot to train himself for shooting mentioned the picture is a bit dark onto his
camera monitor (low light at the under 1/3)! I did not wonder about because lighting wasn't complete at this time!
So I changed light via correction! He stated it is still dark at the under 1/3 of the frame!
I can't belive and asked : still dark? He stated : " it is more "black"???
?So I let me show - and indeed a 1/3 of frame was black! I stated that isn't from lighting
(wondered about before) so my decisioon was to open the 2. package (2 brand new Canons from
the company de both worked for)!
That must be a camera failure ! My sugestion was to shutter because 2. camera shows same
failure! That can not be possible = two brand new cameras with identical technical defect?
I asked him about x - syncronity , what is your shutter speed ?
His answer was 1/300s......
!" Why do you think a 300s is the x-syncronity ???" his answer was that this is the normal shutter speed at x? Realy - why is that " normal (300sec.)
Because he was told
! ( Not by me..
!!)with regards
PS : Shutter is "defect" Paul - you may check at what times - but that will not help - because
you need a service!
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.
"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.
- Joined
- Mar 16, 2012
- Messages
- 3,398
- Format
- Medium Format
Vertically is correct - looking at pic. # 2 = shutter vertically frame horizontally (4,5 x 6)!!
with regards
Do you have a modern smart phone? - Might be worth double checking its video camera app for slow motion modes, or asking friends if they happen to have one, and might give you a better view of what's really going on with its movement.
It depends which orientation the camera's in for each shot; for my first example it was in landscape, the second one in portrait.
I believe the 645nii is in landscape orientation, so the vertical shutter would pass as the photos indicate.
Held in normal orientation, the camera takes landscape format shots. It's a vertically-traveling shutter, so shutter drag could be the cause of the problem in these examples.
It looks like the shutter is slowing or speeding up about 2/3 of the way across the frame. 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.
It looks like the shutter is slowing or speeding up about 2/3 of the way across the frame. 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.
That is why I related the shutter travel to the short side.
However with full format 35mm the short side is vertical as this is the standard orientation of all such cameras. And the shutter travel in technical description is related to that standard orientation. Which makes a vertical travel in your case.
Electronically controlled FPS use relays and electronic timing circuits to determine the speeds. The shutter still runs on spools with spring tension applied.
The first curtain opens then the second closes forming a slit across the film that should stay uniform across the frame. Either one curtain is running slow (extra exposure) or its running fast ( too short of an exposure). Either case it needs a CLA.
| Photrio.com contains affiliate links to products. We may receive a commission for purchases made through these links. To read our full affiliate disclosure statement please click Here. |
PHOTRIO PARTNERS EQUALLY FUNDING OUR COMMUNITY:  |