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11-27-2009, 08:36 PM   #1
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Advanced high speed or manual flash question

Let's assume that we're in a dark room (not a darkroom but it would also work), there is no residual light considering the shutter speed.
If I have a flash firing from my camera (not the built in one) at manual and I have another flash firing off-camera somewhere else in manual slave mode, reacting to the light from my on camera flash.
That would make me able to control the flash at whatever shutter speed I choose, right?

The next problem would be, how can I fool my 360 flash (on board) to flash at high speed sync or manual even that though I want to fire at 1/500 s? My main problem is the pre flash it makes for exposing the situation. As soon as my camera is on manual mode and a flash is connected, it's locked to 1/180 right?
Have I reached the Pentax limit of the 1/180 sync speed? I still remember the 1/60 of the K1000...

11-27-2009, 09:35 PM   #2
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QuoteOriginally posted by StarDust Quote
Let's assume that we're in a dark room (not a darkroom but it would also work), there is no residual light considering the shutter speed.
If I have a flash firing from my camera (not the built in one) at manual and I have another flash firing off-camera somewhere else in manual slave mode, reacting to the light from my on camera flash.
That would make me able to control the flash at whatever shutter speed I choose, right?
That is correct.

QuoteQuote:
The next problem would be, how can I fool my 360 flash (on board) to flash at high speed sync or manual even that though I want to fire at 1/500 s? My main problem is the pre flash it makes for exposing the situation. As soon as my camera is on manual mode and a flash is connected, it's locked to 1/180 right?
Have I reached the Pentax limit of the 1/180 sync speed? I still remember the 1/60 of the K1000...
You cannot trigger faster than 1/180 unless you use High Speed Sync using P-TTL. The camera will not even trigger the flash above 1/180.
11-28-2009, 01:23 AM   #3
Damn Brit
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This thread is a better fit in Camera and Studio Accessories.
11-28-2009, 04:45 AM   #4
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QuoteOriginally posted by alohadave Quote
You cannot trigger faster than 1/180 unless you use High Speed Sync using P-TTL. The camera will not even trigger the flash above 1/180.
That's a bit my point. Is there no workaround? I want to fire the flash in manual so my optical slave doesn't flash during the P-TTL flash and use a faster shutter speed.

I understand the inner workings and why sync speed is at 1/180 but it seems a bit silly that you can't override it with a manual flash the same way you can with P-TTL.

If I'm stuck with P-TTL, can I use an off camera flash as a TTL slave and use HSS? I'm guessing yes, but then I would have to get a flash that speaks the same language...

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