Pentax 67 flash sync and portraits
Sandy Dong
A question on Pentax 67.
I'm considering this as my venture into
medium format. But I noticed that the highest flash synch
on focal (ie., affordable) lenses is 1/30.
Is this fast enough for people (group and otherwise)
portraits?
My main use will be landscape and macro, and
the occasional portrait.
And I will be using a tripod.
Please reply to sd...@gpu.srv.ualberta.ca
Thanks in advance!
Sandy
mha...@speedlink.com
Sandy Dong wrote:
^^^^^^^^^^
> I'm considering this as my venture into
> medium format. But I noticed that the highest flash synch
> on focal (ie., affordable) lenses is 1/30.
Sorry i can't answer your question, but i can tell you that you'd better
wash that thing off quick or you'll be in a world of hurt. :)
sorry....just had to.
Jerry Houston
Sandy Dong wrote:
>
> A question on Pentax 67.
> I'm considering this as my venture into
> medium format. But I noticed that the highest flash synch
> on focal (ie., affordable) lenses is 1/30.
>
> portraits?
>
> My main use will be landscape and macro, and
> the occasional portrait.
Sandy, the question is one of ambient light. Given the f-stop that your
flash equipment requires at the shooting distance, would that opening at
1/30 allow a distracting amount of ambient light to affect the picture?
If you're using relatively powerful flash equipment, or you're working
in very low levels of ambient light (like a portrait in someone's living
room) you may be able to get by just fine with a 1/30 flash sync.
Remember, even if the film is uncovered for 1/30, if the flash only
lasts 1/10000, then that's your effective "shutter speed."
If you're working with low-power flash equipment, or in high levels of
ambient light (like a commercial building or outside), then the flash
may be a relatively small part of the overall exposure, and a shutter
speed of 1/30 might let in a disturbing amount of ambient light.
The best way to find out would be to measure the exposures both ways
under the circumstances where you'll be likely to shoot. Calculate a
proper flash exposure, then calculate an available-light exposure using
1/30 as the shutter speed. How far apart are the f-stops of the two?
If it turns out that you really need an LS lens, consider getting a used
one. I got a 90mm f/2.8 LS lens from KEH a little while ago for $595,
in perfect condition. If you think that's expensive, compare it to any
other brand's leaf-shutter lens of comparable focal length and f-stop.
--
Reply to me personally by first removing the tilde ~ from my
address. It's there to make life difficult for spammers.
MarBau
If you are doing studio portraits where the flash is many stops brighter
than ambient light the 30th sync is not an issue, but if you are doing
outdoor portraits with fill flash the 30th sync is all but impossible to
use unless you buy the Leaf Shutter lens.
Mark.
Some people make art to impress others.
I make art to impress myself.