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10-06-2015, 05:38 PM   #1
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90 LS Lens

I have the 6x7 with a 90 f2.8 LS lens. I haven't used that feature in a long time but remember you have to cock the shutter with it on "U" to function properly. There's also a cable release socket you screw the cable release into. It doesn't work. With the U/S lever set to U and shutter cocked the cable release should trip the lens but it doesn't. Have a missed something here?

10-06-2015, 06:11 PM   #2
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I am using that lens but not on a Pentax 6x7 body.
Firstly move the S/U bar to show the "S" ("U" is covered)
If the bar is pushed lightly against its spring toward covering "S", then
that will fire it if cocked. (Also the cable release will fire it)
Rotate cocking ring clockwise (viewed from rear) to charge the shutter, you should feel it staying charged.
Now it should fire again If the bar is pushed lightly against its spring.toward covering "S"

Note that the above sequence will only complete if the body is holding the aperture lever against its spring.
10-06-2015, 06:17 PM   #3
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That's what I did and it didn't trip the shutter with the cable release.
10-06-2015, 06:28 PM   #4
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cable release is firing the 90LS here.

10-06-2015, 06:37 PM   #5
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Mine works per wombat2go's instructions.
10-06-2015, 06:50 PM   #6
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Well, something's amuck here then. The old 165 f4 LS lens I had didn't have that cable release. What's it for on the 90 lens other than tripping the leaf shutter? Could you not just use the camera's shutter button?
10-06-2015, 07:23 PM   #7
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You might need to download an instruction manual.

I usually just use the S/U lever to fire the shutter.
10-07-2015, 08:13 AM   #8
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I don't often used that feature but, if you want to take some studio portraits with strobes you have to use it. The instruction manual mentioned the cable release on the lens and that's as far as it goes. It said nothing about how to use it or under what situation. It only mentioned what we all know about cocking the shutter and putting it on U.

10-07-2015, 08:18 AM   #9
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I have serviced a small number of shutters but not that one.
Usually the cable simply pushes on an extension of the same lever that is triggered manually.
Did you try a paper clip end?
10-07-2015, 08:29 AM   #10
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I haven't tried that yet but will...soon as I find one.
10-07-2015, 08:45 AM   #11
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Here is a trick you can do with the 90 LS. Set the Pentax 6x7 shutter speed dial half way between 1/1000 and X-Sync and push the shutter button. The camera body's shutter is now locked open.

Use a cable release attached to the lens and now you can do pure, vibration-free leaf shutter exposures. Rotate the shutter speed dial off that position to close the camera's shutter. You can also do as multiple exposures with this technique.
10-07-2015, 09:39 AM   #12
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QuoteOriginally posted by tuco Quote
Here is a trick you can do with the 90 LS. Set the Pentax 6x7 shutter speed dial half way between 1/1000 and X-Sync and push the shutter button. The camera body's shutter is now locked open.

Use a cable release attached to the lens and now you can do pure, vibration-free leaf shutter exposures. Rotate the shutter speed dial off that position to close the camera's shutter. You can also do as multiple exposures with this technique.
+1 works like a charm!

Phil.
10-07-2015, 10:06 AM   #13
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This "Out-Take" not with the Tak 90 LS, but with I suppose its similar and near rival of the day, the Mamiya-Sekor C 1:3.8 90mm
It was rainy day and this was down at 1/60th with Porta 160.
Not fast enough even for a T model "speeding" down a crowded street.
I am intriged at how the leaf shutter recorded the wheel spokes.
Attached Images
 
10-07-2015, 10:27 AM   #14
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I've tried the cable release and a paper clip. Nothing is tripping that shutter with it cocked and on "U". I don't know what's wrong. If I simply use the cable release screwed into the shutter button top it works but not on the lens itself.
10-08-2015, 12:28 PM   #15
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FYI-- the 90 LS Takumar has probably the worst reputation of all the 67 lenses for reliability. The 165LS was much improved.
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