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Thread: Pentax 645

  1. #1

    Join Date
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    Pentax 645

    I bought a Pentax 645 and all my other cameras and equipment are canon does any body know if my canon speed lite 430 ex2 will work with the Pentax?

  2. #2

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    Should work ok in manual mode. I know my Nikon SB800s work on my Pentax 645. I just use them in A mode where the flash itself computes the exposure. I believe the Canon flash has a low triggering voltage so that should not be an issue. If the Canon has a mode similar to Nikon's A mode then you should have some auto flash exposure capability.

  3. #3

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    Doubtful that they'll work in any dedicated TTL mode directly, mounted in the shoe. If you're using print film, it won't be such an issue, but with transparency it may be.
    Interestingly, I discovered my Pentax 645N will work with my Nikon-shoe'd Yongnuo flash triggers--and the wakeup feature works with my Nikon SB800s. Not in TTL auto and radio wireless both, but it's a neat feature for wildlife remotes at night.
    Also discovered I can also use my Pentax 200T (or almost any Pentax analog and most digital TTL dedicated flash in the shoe or on a bracket with a dedicated TTL cord), and with the flash set to TTL, also use a couple of Nikon SB800s remotely in Optical TTL mode. The Pentax 645 has true/realtime Off-The-Film sensor flash metering to measure the light and quench the flashes --even the optically triggered and quenched Nikon ones--when enough light has built up on the film. Most other modern and all digital cameras have TTL that is preflashed-- and measured by the metering cells in the prism before the mirror swings up and these generally won't work with common optical slaves/triggers. But not the Pentax 645/645N (nor the LX, nor the PZ-1). Pentax film era gear thus offers a lot of flexibility with optical flash triggers.

    The key to doing this is to set the remote flashes close enough to the subject that they're not overpowering the subject before they can be quenched. Kinda goofy, but works great (Goofier still is that the dedicated Pentax AF500FTZ flashes of the era don't have optical TTL quench, though they do have optical triggers built in.)

    Too, the 645s will work with most of the dedicated Pentax TTL flashes going back decades. These often sell for cheap because the analog ones like the 280T and 200T don't work in TTL with recent cameras that preflash. I've bought any number of old perfectly working ones for $20-40.
    Last edited by Pupfish; 02-12-2012 at 04:37 PM. Click to view previous post history. Reason: clarity

  4. #4

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    Canon flash

    Ok thanks for the help my mane concern is damaging the camera but with the low voltage shouldn't be a problem hey does any body know we're I can get a light seal kit for the film back?

  5. #5
    laymonk777's Avatar
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    Hi all, I'm new here. I just purchased a Pentax 645 and am ready to get started with it. I'd like to get a replacement eyecup for it. Would anyone on the board have one they would want to part with?

    Thanks!



 

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