Matthew Hunt <[email protected]> wrote: >On Thu, Feb 18, 2016 at 11:27 AM, Mark Roberts ><[email protected]> wrote: > >> Here's a question I haven't seen asked (or answered) yet: How will the >> zoom head on flash units like my AF540FGZ respond to the K-1 and its >> wider field of view (for the same focal length) than APS-C cameras? >> >> I would hope either the camera or the flash makes the necessary >> adjustments without the end user needing to do anything like update >> firmware or buy a new flash unit. > >I have a P-TTL Metz 48 AF-1 that shows the focal length on the LCD. On >my APS-C cameras, the focal length displayed on the flash is the >35mm-equivalent focal length. (That is, if I have a 50mm lens on the >camera, the flash shows 75mm.) So I think the Pentax flash protocol is >working in 35mm focal lengths already, and the APS-C cameras fudge it >so the flash covers the APS-C FOV. > >If the AF540GZ displays the focal length, and it's the true focal >length (not 35mm-equivalent), then I would speculate that either the >flash is fudging it back to APS-C for display purposes (so you might >need a firmware update for display accuracy) or the flash protocol is >designed to explicitly support both FF and APS-C (but Metz didn't >implement that part of the protocol). Either way, I think you'll be OK >as far as the actual flash zoom mechanism is concerned.
Thanks, Matt. This occurred to me while at school and I don't have the flash handy but I think it does show "35mm equivalent" focal lengths. This makes sense as the flash was probably made to be backwards-compatible with film cameras. Come to think of it, it was probably made to be compatible with the 645D, so it should be no surprise that accommodating different Angles of View is part of the design. -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
