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09-09-2015, 09:41 PM   #16
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Thanks guys for this. I had the same problem with the 75LS. I have a 135LS that works great but could not get the 75 to synch over a 60th of a second. Taping the contact on the far left did the trick!

Now if we can just get Pentax to build two new LS lenses, we'll be all set!

09-10-2015, 07:49 AM   #17
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Autofocus LS-Lenses would be great. Especially a new 135mm one ... I would simply love to own one!
09-10-2015, 10:33 AM   #18
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The only way any of us can buy leaf lenses is to get them on the used market
09-10-2015, 11:45 AM   #19
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i am still hoping for new ones

09-11-2015, 07:39 AM   #20
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"Hope Springs Eternal."
09-12-2015, 06:56 PM   #21
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I doubt theyre coming out with LeafShutter lens anytime soon. Pentax is worrying more about their full frame camera and lenses more then the 645 buyers. Maybe in a few years if they continue with the 645 or just dump it in favor of sales of their full frame camera.
09-12-2015, 07:57 PM   #22
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As much as I like medium format digital, I have to wonder if the new Canon Mega-Multi-Pixel full frame gear will eclipse MF.

---------- Post added 09-12-15 at 10:02 PM ----------

Looking at my previous email I note that when I wrote full frame this site hyperlinked me to the upcoming Pentax. If that thing is 36 megapixel, as rumored, It may well move 645 development to the back burner.
09-13-2015, 11:04 AM   #23
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Would be nice if Pentax would release more news about upcoming 645 lenses. Right now I'm really interested in the Priolite flash system that promises high speed flash sync for all lenses. Has anybody used that yet?

09-13-2015, 12:52 PM   #24
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QuoteOriginally posted by salpardido Quote
Would be nice if Pentax would release more news about upcoming 645 lenses. Right now I'm really interested in the Priolite flash system that promises high speed flash sync for all lenses. Has anybody used that yet?
If this works as advertised it will obviate any need for leaf shutters, Right now it seems the Priolite system is mostly for studio setups, not necessarily for fast moving field work.
01-14-2016, 07:01 AM   #25
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i tried both with ,y 75 and 135 ls....with 135 iso hit and miss but now more miss with 75 only miss....what contact i have to cover?
can somebody post a photo?
i think problem is my 645d has shutter with small delay, probably need some fix but to change shutter will cost more than camera.....any help^
02-20-2016, 01:29 PM   #26
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Feeling that some people are confused as I have had no issue at all with the 75 and 135 ls lenses on 645z. Just to go over the simple and obvious, you must connect the flash to the socket on the lens, not to the camera. If this is a hotshoe flash, it cannot be placed on the hotshoe without doing something to break that connection. The second thing is that the leaf shutter has to be cocked before each exposure. The cocking mechanism is on the front of the lens near the leaf shutter speeds.

When I use this on the 645z, the shutter speed is displayed on the back of the camera as "LS." The leaf shutter must be cocked. When the shutter is released, the camera's focal plane shutter opens fully, then the leaf shutter opens and the flash fires. Then the focal plane closes. Then the leaf shutter must be recocked for the next exposure.

To test, put the flash ten feet from your main subject. Set the camera to f8. The shutter speed shoud read as LS. Set the lens shutter to 1/500 and cock it. You should have some flash illumination on your subject. Adjust the aperture or flash power to correct the exposure on the subject. Your bg is probably dark. Set the leaf shutter to a slower setting to lighten the bg.

All pretty easy, but if you are not connecting the flash to the lens only and cocking the leaf shutter everytime - it will not work. Hope that helps someone.

Last edited by thomasfallon; 02-20-2016 at 07:53 PM.
04-21-2016, 06:28 AM   #27
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Just received a 75mm LS. On 645z, it only works at 1/60. Above this speed, I get a blank frame 95% of the time, and either a partial or full frame the other 5%. Looks like a sync issue between the 645Z Focal Plane and the Leaf Shutter. I'm going to try taping the contact as described above.

Last edited by glass; 04-21-2016 at 06:36 AM.
04-21-2016, 06:42 AM   #28
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QuoteOriginally posted by glass Quote
the tips of some of the leaf shutter blades seem to be bent. Is this normal?
While I don't know for your lens, I can verify that on the old Super-Multi-Coated Takumar /6x7 1:2.8 90mm here, that the visible front leaf is "bent".

Same for a Copal "0" on a Super Angulon here. ( The former owner gave a discount for that, but I am sure it is part of the design of some of the Copal shutters.)
04-21-2016, 02:16 PM   #29
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I confirm that taping the contact works as described above. The other advantage is being able to use live view zoom again for critical focus, for some reason the official LS mode disables that functionality.

I hope Pentax fix both these issues in a firmware update; having to tape lenses that are supposed to be compatible is not ideal.
04-28-2016, 12:40 PM   #30
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I just started using the 75 and a pocket wizard to communicate with the strobes.
I modded the radio trigger so it has no contact with the hot shoe on the 645d. Haven't played with it a lot yet but no shutter issues. The camera body displays LS and shows the manually set aperture value.
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