[Ecem Zekai]

I have been wondering if we can use a leaf shutter lens via adapters to get higher sync speed than Pentax's allowance ( i believe 1/160).

I have found several MAMIYA 645 70mm 2.8 Leaf Shutter lenses under 150£.

My question is can i archive faster shutter speed with leaf shutter lenses + adapters ?

[enoeske]

I have been wondering if we can use a leaf shutter lens via adapters to get higher sync speed than Pentax's allowance ( i believe 1/160).

I have found several MAMIYA 645 70mm 2.8 Leaf Shutter lenses under 150£.

My question is can i archive faster shutter speed with leaf shutter lenses + adapters ?

Pentax's sync speed is 1/180th. The Q-S1 can do 1/250 or up to 1/1000 with its leaf shutter lenses.

That being said, what, exactly, in the Pentax body would communicate with and trigger the leaf shutter in a Mamiya 645 lens?

[Ecem Zekai]

Pentax's sync speed is 1/180th. The Q-S1 can do 1/250 or up to 1/1000 with its leaf shutter lenses.

That being said, what, exactly, in the Pentax body would communicate with and trigger the leaf shutter in a Mamiya 645 lens?

Thanks for the info! I always though it was 1/160.


That's the part i could't figured and asked if anybody ever archived that ( if its possible). I would love to archive 1/250 with my K5

[stevebrot]

That's the part i could't figured and asked if anybody ever archived that ( if its possible). I would love to archive 1/250 with my K5

Your K-5 cannot achieve normal flash sync at higher than 1/180s. High speed sync (HSS) is possible with an appropriate flash system, but that is another topic. Adapting a leaf shutter lens may be possible if the lens has a manual aperture and both shutter release and PC connector on the lens. The sequence goes something like this with your K-5:

• Camera in bulb mode ("T" option)
• Flash connected to lens via PC cable, do not use camera hot shoe
• Flash in fully manual mode
• Focus using viewfinder of live view
• Close lens shutter
• Open camera shutter
• Make exposure using lens shutter
• Close camera shutter

Yes, you will be firing blind and yes, the whole sequence should be done quickly. Sound like a good idea? I thought not


Steve

[gofour3]

Pentax made a 6x7 to K-Mount adaptor, however you could not use the 6x7 Leaf Shutter lenses on a 35mm camera.

So my guess is you are out of luck.

Phil.

[wombat2go]

Using the method outlined by Steve:
There are a limited number of Pentax medium format lenses with leaf shutters (to 1/500th), 90 LS shown below, that can be hand cocked and triggered, and adaptors are available to a Pentax aps-c dslr.
Problem is that the focal lengths might be too long for dslr use.

The Mamiya RB67 lenses of all focal lengths have leaf shutters (to 1/400th), and are available used at reasonable cost for amateur use. But these can only be cocked by the body via a rotary coupling in the bayonet mount. These lenses have no focus scroll, requiring focus throw in the camera body.
No easy way to use these on a dslr.

However I think the Mamiya 645 lens mentioned by Ecem could be made to work on a dslr,
requiring a custom adaptor.

[Ecem Zekai]

At least i know it can be done somehow but seems like totally not worth it ^^. I will look into High speed sync thing, i heard of it but never bothered to google.

[narual]

if HSS won't work for whatever specialized need you have - go buy an old Nikon D70s. It syncs at 1/500 with a nikon TTL flash. Use a manual non-nikon flash or tape the pins (except the center) on a nikon model and you can sync up to I think 1/2000 with full power, and up to 1/8000 with 1/4 power. (It *might* be 1/1000 and 1/8 power at 1/8000 - I forget. I sold mine a couple years ago).Some other old Nikon cameras could do the same, but that was the last/newest/best one they made. After that, they switched to CMOS sensors and had to have a physical shutter.

[gofour3]

Here is a copy of the Pentax 6x7 to K-Mount adapter:

http://c2b6d376b97bcc466063-5420c200a1f030d1394a9548df6eadbd.r5.cf2.rackcdn....200_manual.pdf

On page 3 it indicates that you can not use a penatx 6x7 leaf shutter lens on this adapter.

Phil.

[wombat2go]

On page 3 it indicates that you can not use a penatx 6x7 leaf shutter lens on this adapter.

I am using the Tak 6x7 90mm LS on my home built camera bodies.
I have an arm in my lens mount adaptor to hold the shutter closed until it is triggered.

I might look at making an adaptor to the K-mount some time.

[robjmitchell]

Sounds complicated, Using a ND filter or HSS compatible flash seem way easier if you don't have a leaf shutter lens already. Obviously the cost is flash power.

[stevebrot]

I will look into High speed sync thing

HSS is done by the flash issuing a series of low-power bursts during the exposure. Effective guide number decreases with increased shutter speed. This is a flash feature, but generally requires coordination with the camera body providing control signal to the flash. What this usually means is that you need a dedicated Pentax-compatible flash that also supports HSS. Notice the waffle words "generally" and "usually". I put those in because there apparently is the option to use recent Cactus products to emulate HSS without true camera dedication.


Steve

[K-Three]

However I think the Mamiya 645 lens mentioned by Ecem could be made to work on a dslr,
requiring a custom adaptor.

This may help?
http://www.amazon.com/Fotodiox-Adapter-Mamiya-K-Mount-forPentax/dp/B0073ARXOQ