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jaywes · 02-13-2015, 05:39 PM

Hello all,

I have a family event coming up which I will be doing photography for. I have a manual flash but for this event I wanted a dedicated P-TTL flash. I have a Photozuela Montana C600 (which will fall to a back up).

I just received my BOWER SFD926P and have a question about its usage. I was test shooting and noticed the shutter speed is limited while the flash is on hot-shoe. In 'front curtain' shutter speed is limited to 1/90. With 'rear curtain' it's limited to 1/180. Is this normal? I did not see anything in the manual. I do not foresee this hindering my photos but do want to make sure I do not have a faulty unit. Anyone with this flash, please chime in. Thanks!

**boriscleto** · 02-13-2015, 05:42 PM

It is normal.

stevebrot · 02-13-2015, 07:58 PM

Originally posted by boriscleto

It is normal.

1+

It is normal and is probably in your camera manual.

Steve

sterretje · 02-13-2015, 09:26 PM

Originally posted by jaywes

I was test shooting and noticed the shutter speed is limited while the flash is on hot-shoe. In 'front curtain' shutter speed is limited to 1/90. With 'rear curtain' it's limited to 1/180

Are you sure it's that way around? I was recently shooting with the AF540FGZ, moved the flash mode to 'rear curtain' by accident and it would not go over 1/90s.

jaywes · 02-15-2015, 02:20 PM

Thank you all! Didn't see it in manual but I will check it now.

Originally posted by sterretje

Are you sure it's that way around? I was recently shooting with the AF540FGZ, moved the flash mode to 'rear curtain' by accident and it would not go over 1/90s.

I'm pretty sure that's how tho one functioned. Either way I should be ok.

**Lowell Goudge** · 02-15-2015, 02:36 PM

Front curtain sync should be 1/180, all pentax bodies, at least since the PZ-1 have rear curtain sync at 1/2 front curtain sync speed. This ensures that the shutter is open for the duration of the flash., before the rear curtain starts to close .

If you consider flash duration is 1/180 maximum, to have a rear curtain sync where the flash fpgoudge off then the shutter closes, it has to be at 1/2 the leading curtain sync. This should not be limiting because rear curtain sync is intended to freeze a blur at the instant the shutter closes. So for this you want a relatively slow shutter like 1/30 or something, with the burst at the end of the duration

02-13-2015, 05:39 PM	#1
jaywes Senior Member Join Date: Apr 2012 Location: New York, USA Posts: 235	Is this normal? Bower P-TTL Flash Hello all, I have a family event coming up which I will be doing photography for. I have a manual flash but for this event I wanted a dedicated P-TTL flash. I have a Photozuela Montana C600 (which will fall to a back up). I just received my BOWER SFD926P and have a question about its usage. I was test shooting and noticed the shutter speed is limited while the flash is on hot-shoe. In 'front curtain' shutter speed is limited to 1/90. With 'rear curtain' it's limited to 1/180. Is this normal? I did not see anything in the manual. I do not foresee this hindering my photos but do want to make sure I do not have a faulty unit. Anyone with this flash, please chime in. Thanks!

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02-13-2015, 05:42 PM	#2
boriscleto Loyal Site Supporter Join Date: Dec 2009 Location: North Syracuse, NY Photos: Gallery Posts: 16,477	It is normal.

02-13-2015, 07:58 PM	#3
stevebrot Otis Memorial Pentaxian Join Date: Mar 2007 Location: Vancouver (USA) Photos: Gallery \| Albums Posts: 42,007	Originally posted by boriscleto It is normal. 1+ It is normal and is probably in your camera manual. Steve

02-13-2015, 09:26 PM	#4
sterretje Veteran Member Join Date: Dec 2008 Location: Roodepoort, South Africa Photos: Gallery \| Albums Posts: 3,561	Originally posted by jaywes I was test shooting and noticed the shutter speed is limited while the flash is on hot-shoe. In 'front curtain' shutter speed is limited to 1/90. With 'rear curtain' it's limited to 1/180 Are you sure it's that way around? I was recently shooting with the AF540FGZ, moved the flash mode to 'rear curtain' by accident and it would not go over 1/90s.

02-15-2015, 02:20 PM	#5
jaywes Senior Member Join Date: Apr 2012 Location: New York, USA Posts: 235 Original Poster	Thank you all! Didn't see it in manual but I will check it now. Originally posted by sterretje Are you sure it's that way around? I was recently shooting with the AF540FGZ, moved the flash mode to 'rear curtain' by accident and it would not go over 1/90s. I'm pretty sure that's how tho one functioned. Either way I should be ok.

02-15-2015, 02:36 PM	#6
Lowell Goudge Site Supporter Join Date: Jan 2007 Location: Toronto Photos: Gallery \| Albums Posts: 17,892	Front curtain sync should be 1/180, all pentax bodies, at least since the PZ-1 have rear curtain sync at 1/2 front curtain sync speed. This ensures that the shutter is open for the duration of the flash., before the rear curtain starts to close . If you consider flash duration is 1/180 maximum, to have a rear curtain sync where the flash fpgoudge off then the shutter closes, it has to be at 1/2 the leading curtain sync. This should not be limiting because rear curtain sync is intended to freeze a blur at the instant the shutter closes. So for this you want a relatively slow shutter like 1/30 or something, with the burst at the end of the duration

Is this normal? Bower P-TTL Flash

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