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05-15-2015, 04:46 PM   #1
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k-s2 external flash sync

the specs say this camera has a
Synchronization speed: 1/180 sec

for the external flash. But the shutter speed of the camera goes from 1/125, 1/160, 1/200. So the fastest I can really sync is 1/160 sec. I thought it was lens specific but the same lenses all work at 1/180 on my k100d.

This is really low for trying to work in daylight. Canikon is 1/200 sec.

05-15-2015, 05:32 PM   #2
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With an af-360fgz in standart sync mode the shutter speed can go up to 1/180 sec.
With remote trigger (Cactus v4) max shutter speed is 1/160 sec.

I don't really think, that in daylight there will be big difference between 1/160 an 200. Anyway you will need a nd filter or use speed sync to get fast aperture.
05-15-2015, 10:11 PM   #3
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You have 1/3 eV steps enabled in the camera; change to 1/2 eV steps and 1/180s will be available (see p48 of the English manual). I don't know if the camera has a dedicated X setting somewhere but that will also give 1/180s, regardless of eV steps.

Last edited by sterretje; 05-15-2015 at 10:17 PM.
05-15-2015, 10:47 PM   #4
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A dedicated flash for Pentax (at least 3 pins on the foot) will set the shutter speed to 1/180 sec when mounted, charged and ready in the hot shoe or connected via ttl/p-ttl cable. This has been a standard feature of Pentax cameras since the 1980's when flash dedication was introduced.

If you are using the slow shutter flash sync setting speeds less than 1/180 sec can be used.

05-16-2015, 10:33 PM   #5
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QuoteOriginally posted by Not a Number Quote
A dedicated flash for Pentax (at least 3 pins on the foot) will set the shutter speed to 1/180 sec when mounted,
I've never seen that happen; might be the case in P or green mode, but definitely not in Av or M. There are a few 'rules' implemented in the software of the camera to determine the shutter speed that the camera will use with flash; focal length and exposure for ambient seem to be part of it.
05-17-2015, 02:25 AM   #6
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Sterretje is correct, except about having an X mode.
05-20-2015, 02:13 PM   #7
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QuoteOriginally posted by sterretje Quote
I've never seen that happen; might be the case in P or green mode, but definitely not in Av or M
This is how it works for me on K10D, my brother's K20D and a friends K-7:

In P, M, TAv, and Tv if the shutter speed is lower than 1/180 to begin with it stays at that setting, You can change it but are limited to 1/180. If it is higher than 1/180 it gets set to 1/180. In Av and Sv mode it gets set to 1/180 no matter what but in Sv mode you can choose a slower shutter speed, but can't go above 1/180..
05-20-2015, 07:03 PM   #8
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Sterretje helped me out. With my cheap ebay remote triggers for my flashes at 1/200 stays at that. Ev 1/2 gives me 1 / 60, 90,125,180,250. 1/3 gives me 1/ 60, 80,100,125, 160, 200,250. Its nice having the additional options. The difference shouldn't matter much so I am sticking with the ev 1/3 unless I am battling the sun. Those umbrellas can only go so close before they are in the picture. I am usually stretching it so I need all the lea way I can get. Thanks for the responses.

05-20-2015, 10:44 PM   #9
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QuoteOriginally posted by Not a Number Quote
This is how it works for me on K10D, my brother's K20D and a friends K-7:

In P, M, TAv, and Tv if the shutter speed is lower than 1/180 to begin with it stays at that setting, You can change it but are limited to 1/180. If it is higher than 1/180 it gets set to 1/180. In Av and Sv mode it gets set to 1/180 no matter what but in Sv mode you can choose a slower shutter speed, but can't go above 1/180..
Your original statement was too absolute Glad that you worked out more details now

I mostly live in Av. A K10D (firmware 1.30, with DFA100WR mounted) in Av switches to 1/125s in lower light conditions. The Pentax algorithm takes (amongst other things) focal length into account (shutterspeed basically 1/fl). With the 18-55, it varies from 1/30 to 1/60s in lower light conditions.
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