Super A, aperture not working?


Pentaxophile

Link Posted 04/01/2012 - 22:01
I've only just got this camera, and something isn't right with the aperture linkage I think. Stopping the lens down results in a dark viewfinder. The A setting or using a DA lens results in a fully stopped down dark dark viewfinder. Doesn't make any difference in M or auto shutter mode. Am I making a school boy error or is there a problem with the body?
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doingthebobs

Link Posted 04/01/2012 - 22:13
First thing to check is that the lens is mounted properly.

Make sure that it is completely on and won't undo without using the release catch.
Bob

Pentaxophile

Link Posted 04/01/2012 - 22:26
Lens seems well clicked on. In Tv mode, the viewfinder display tells me the aperture is f2.8 but the viewfinder is dark. (Lens is set to A, shutter set to manual).
[link=https://500px.com/will_brealey/[/link]

Pentaxophile

Link Posted 04/01/2012 - 22:36
There's a lever inside the mount which engages the lever on the lens to keep the aperture open. On my z70 this is lowered so it engages with the lever on the lens as you turn it into position. On the superA it is raised, so the lens lever doesn't touch it. I can pull it down with my nail, it gives little resistance, but it returns to the raised position.
[link=https://500px.com/will_brealey/[/link]

doingthebobs

Link Posted 04/01/2012 - 22:59
Yes, that is the lever that stops the lens down when you fire the shutter. Should be down when the camera is not taking a picture.

Is the depth of field preview lever operating ok? (on the right hand side of the lens mount. This should move that lever inside the mount, to stop down the lens.
Bob
Last Edited by doingthebobs on 04/01/2012 - 23:11

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johnriley

Link Posted 04/01/2012 - 23:09
Is the DOF preview lever (stop down lever) jammed in its operational position?
Best regards, John

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Pentaxophile

Link Posted 04/01/2012 - 23:17
Yes! The dof preview lever is extremely stiff, and stuck in the on position. However it can be forced into the off position and that cures the problem! Thanks!
[link=https://500px.com/will_brealey/[/link]

stevejcoe

Link Posted 04/01/2012 - 23:18
Pentaxophile wrote:
There's a lever inside the mount which engages the lever on the lens to keep the aperture open. On my z70 this is lowered so it engages with the lever on the lens as you turn it into position. On the superA it is raised, so the lens lever doesn't touch it. I can pull it down with my nail, it gives little resistance, but it returns to the raised position.

It should be down on the Super A also. The return spring has probably become detached.

Regards - Steve

Pentaxophile

Link Posted 04/01/2012 - 23:20
A blast of WD40 on the lever, and all's well now.
[link=https://500px.com/will_brealey/[/link]

doingthebobs

Link Posted 04/01/2012 - 23:36
I hope the blast was on the outside!!

Generally it is best to keep WD40 well away from cameras!



Hope you enjoy the Super A. I had mine new back in the 80's and It's still going strong.
Bob

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fatspider

Link Posted 04/01/2012 - 23:44
Quote:
Generally it is best to keep WD40 well away from cameras!

Apart from gunking up the mirror, focusing screen and shutter I cant see what the problem would be, oh! apart from getting onto the inside element of whatever lens is fitted
My Names Alan, and I'm a lensaholic.
My PPG link
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Pentaxophile

Link Posted 05/01/2012 - 07:36
Obviously the WD40 was on the outside of the camera, which is where the dof preview lever is located

It's a handsome camera. Next up I'll have to deal with the light seals, as they're rather sticky and perished looking. Or should the dealer have sorted them?
[link=https://500px.com/will_brealey/[/link]
Last Edited by Pentaxophile on 05/01/2012 - 08:09

Algernon

Link Posted 05/01/2012 - 09:11
Sounds like a very Rocky camera
Half Man... Half Pentax ... Half Cucumber

Pentax K-1 + K-5 and some other stuff

Algi

Pentaxophile

Link Posted 05/01/2012 - 10:07
Hmm yes perhaps so! I kind of half anticipated needing to do the light seals to be honest. Oh things are much simpler with the P30 series cameras (and later cameras), which don't have foam light seals!

I found a tutorial on using wool thread rather than foam as a replacement light seal - looks a bit easier - http://photo.net/classic-cameras-forum/00SVtt?start=0
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Cuchulainn

Link Posted 05/01/2012 - 10:24
I've used wool on quite a few cameras and it has always worked well. Use a glue with a bit of give (i.e not superglue) so that the flexibility of the strands remains when it dries. Velvet edging tape works well and is cheap (about a pound per meter from sewing/craft shops) for the light seals at the door edges and along the hinge.
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