My Hasselblad 500C/M with 80mm planar is seriously out of sync

[ahaavie]

All of a sudden my Hasselblad is acting very strange. All of a sudden it exposes only half the negative with light. It looks that the picture is taken when I RELEASE the button, and not when I push it. Something must have happened with this lens. My local camera repair guy doesn't know what it is. Any idea? (please tell me if there is another forum that might be more appropriate)

 

[Sirius Glass]

Fire the shutter and HOLD THE BUTTON DOWN until the shutter closes on longer exposures. That keeps the barn doors open while the shutter is open.

 

[ahaavie]

Ok. I am a bit puzzled. Would that fix my problem?

 

[BrianShaw]

What shutter speed were you using. If it was a slow one then, yes, that could be the problem. On CF lenses the slow shutter speeds have an indicator as a reminder. Not sure about the c lenses but the situation is the same.

Have you fired the camera with the back off to observe the behavior of the “barn door” shutter in the body to ensure that they are operating correct?

 

[ahaavie]

What shutter speed were you using. If it was a slow one then, yes, that could be the problem. On CF lenses the slow shutter speeds have an indicator as a reminder. Not sure about the c lenses but the situation is the same.

Have you fired the camera with the back off to observe the behavior of the “barn door” shutter in the body to ensure that they are operating correct?

The barn door behaves perfect. The photos I have been taking have been between 125th and 500th of a sec. Very strange.

 

[campy51]

It looks like the bottom half of the barn doors are not open

 

[BrianShaw]

It looks like the bottom half of the barn doors are not open

That’s what it looks like to me. At fast shutter speed there’s not likely other sources of such an obstruction... unless there’s an errant piece of paper inside the camera or film back.

 

[MattKing]

It looks like the bottom half of the barn doors are not open

I'd agree, although I expect that it is the top half that is misbehaving - images end up inverted at the film plane.

 

[Sirius Glass]

So time for a CLA.

 

[eli griggs]

Untill you have your Hasselblad CLA, shot a roll with the barn does locked up, at all speeds and remember to keep the release pressed in for the slowest timed settings and, of course "B".

This way you can still use your camera, if nothing odd or off spears, while you look for a repair person.

IMO.

Godspeed to you and yours, and everyone else,
Eli

 

[itsdoable]

Both barns are not fully open when the lens shutter is released. The top barn opens slower/later due to the mirror, and the overlap with the bottom barn.

Could be out of sync, or a slow barns door mechanism.

Do both barn doors fully open at longer shutter speeds? if not, you probably need a new rubber brake wheel.

 

[nickandre]

Both barns are not fully open when the lens shutter is released. The top barn opens slower/later due to the mirror, and the overlap with the bottom barn.

Could be out of sync, or a slow barns door mechanism.

Do both barn doors fully open at longer shutter speeds? if not, you probably need a new rubber brake wheel.

Yeah take off the back and lens, fire the shutter, and look at the barn doors. They should be open until you release the shutter.

Some people have seen similar with flocking getting dislodged.

Regardless probably get a CLA.

 

[Jim Kilroy]

All of a sudden my Hasselblad is acting very strange. All of a sudden it exposes only half the negative with light. It looks that the picture is taken when I RELEASE the button, and not when I push it. Something must have happened with this lens. My local camera repair guy doesn't know what it is. Any idea? (please tell me if there is another forum that might be more appropriate)

I see this problem on occasion in the shop. It can be the auxiliary shutters are not opening and closing properly. Usually due to a bad main spring. The brake mechanism could be faulty too. However, to me it doesn’t look like a barn door issue at all. It could be sequence issue. I think the lens is timed improperly. To check, remove the lens and back and determine if the auxiliary shutter is opening and closing correctly. No hang ups or slow closing. If it is working well then it is your lens. If the bridge needs adjusting or repair, then the shutter may be opening later than it should be causing it to open when the auxiliary shutter is actually closing. Next roll, put the shutter button to “T” and then the auxiliary shutter will stay open throughout the whole cycle until you return it to “O” and the doors close. If the blocking of the image goes away then I’d say time for a service of your lens. If the auxiliary shutter is obviously wonky then get the body serviced. I would actually just get the body and lens to someone qualified and have them both inspected. It could be the “relationship” between the body and lens as well.

 

[Philippe-Georges]

Ahaavie, I can see that these pictures are taken during the winter, so due to the aging of the lubrification it has stiffen up and in the cold outside, it slows down the mechanical actions of the camera even more.
A way to check is to keep the camera warm and dry fire it without the filmchassis, do the same when the camera is cold. Then you can observe the difference.
Anyway a CLA is (always) needed...