K-x @ 1/60 has black stripe

crimespree · 02-04-2011, 03:32 PM

I'm not sure why but when i use my k-x in full manual, with or without a flash, if im shooting at 1/60th of a second, there is a dark line on the bottom of the exposure.
This line is about 1/3rd of the frame. its just a dark under exposed section of the frame. i dont know how else to describe it. at 1/50th its fine, and 1/80 is also fine. it only does it at 1/60th/

Also tried different lenses to make sure it was the body. any suggestions? Is this the case with any other k-x's?

enoeske · 02-04-2011, 03:53 PM

can you post one of the offending images to help us diagnose the issue? ideally one without flash and one with flash

KxBlaze · 02-04-2011, 03:55 PM

Is it there when you view the pictures on a computer or only when you view it on the camera LCD? I have heard others on here say they have had similar problems but do not remember the solution. I suggest doing a search for those threads.

crimespree · 02-05-2011, 05:32 PM

It is there only when i use a flash. I use a AF540FGZ and the first few exposures dont have it. here are a couple samples.

<a href="http://smg.photobucket.com/albums/v78/less-than-zero/?action=view&current=1-601of2.jpg" target="_blank"><img src="http://img.photobucket.com/albums/v78/less-than-zero/1-601of2.jpg" border="0" alt="Photobucket"></a>

<a href="http://smg.photobucket.com/albums/v78/less-than-zero/?action=view&current=1-602of2.jpg" target="_blank"><img src="http://img.photobucket.com/albums/v78/less-than-zero/1-602of2.jpg" border="0" alt="Photobucket"></a>

cats_five · 02-06-2011, 02:18 AM

What focal length? It looks like the lens hood is shading the flash from the lower part of the scene.

wmich · 02-07-2011, 08:20 PM

crimespree, I have the same problem but only when I use my k-x and 360 with radio triggers(FlashWave). I do not have a problem when I use P-TTL on the hot shoes. Are you using P-TTL?

enoeske · 02-07-2011, 08:23 PM

If you are using wireless radio triggers, its quite possible that your triggers aren't up to the task of syncing at 1/180. You may need to lower the shutter speed a bit, try 1/120 or 1/80 if the ambient isn't a problem.

bobmaxja · 02-07-2011, 08:49 PM

See this Video, they will explain your black section on your photo

http://www.youtube.com/watch?v=hvZ6VujbhjM&feature=player_embedded#

**Lowell Goudge** · 02-08-2011, 02:56 PM

I had an issue like this with my K10D which had the stripe getting wider and wider as the shutter speed increased.

Ultimately they replaced the shutter mirror and lens mount.

Although I can't prove it, and don't recall dropping the camera, I am sure that is what happened.

The trailing curtain was moving incorrectly

bobmaxja · 02-08-2011, 03:00 PM

If you use flash and you increase the shutter speed, the black stripe will grow. Normal the flash sync on Pentax is max at 1/180. Anything over 1/180 will show black stripe
Nothing wrong with the curtain
Look at the video link I attached.

enoeske · 02-08-2011, 03:04 PM

Originally posted by bobmaxja

If you use flash and you increase the shutter speed, the black stripe will grow. Normal the flash sync on Pentax is max at 1/180. Anything over 1/180 will show black stripe
Nothing wrong with the curtain
Look at the video link I attached.

the camera doesn't trigger the flash at speeds above 1/180th at all, so no worry about exceeding the max sync speed.

still looks like a trigger sync issue -- the triggers aren't able to keep up with the camera max sync speed. Try some fresh new batteries in the flash, commander and receiver.

**Lowell Goudge** · 02-08-2011, 03:31 PM

Originally posted by bobmaxja

If you use flash and you increase the shutter speed, the black stripe will grow. Normal the flash sync on Pentax is max at 1/180. Anything over 1/180 will show black stripe
Nothing wrong with the curtain
Look at the video link I attached.

Originally posted by enoeske

the camera doesn't trigger the flash at speeds above 1/180th at all, so no worry about exceeding the max sync speed.

still looks like a trigger sync issue -- the triggers aren't able to keep up with the camera max sync speed. Try some fresh new batteries in the flash, commander and receiver.

guys

read the OP's post.

he says with or without flash.

Sounds like a sticking curtain.

enoeske · 02-08-2011, 03:35 PM

Originally posted by Lowell Goudge

guys

read the OP's post.

he says with or without flash.

Sounds like a sticking curtain.

he seems to have amended his comments later...

Originally posted by crimespree

It is there only when i use a flash. I use a AF540FGZ and the first few exposures dont have it. here are a couple samples.

when you say the first few frames don't have it, are you shooting in bursts? Are you letting the flash recycle fully?

**Lowell Goudge** · 02-08-2011, 03:52 PM

Originally posted by enoeske

he seems to have amended his comments later...

when you say the first few frames don't have it, are you shooting in bursts? Are you letting the flash recycle fully?

Oops I missed that

If it is flash and he is set to trailing curtain sync and has the flash at full power then the flash duration exceeds the time the shutter is fully open. This can also be seen at full power and max sync on leading curtain sync

crimespree · 04-13-2011, 12:27 PM

Sorry about this lapse in response. It is apparently a trigger based issue. I can however shoot at 1/180 and all over the shutter speed board with no weirdness in exposure. ONLY at 1/60th of a second. and only with a wireless trigger.

02-04-2011, 03:32 PM	#1
crimespree New Member Join Date: Jul 2010 Location: Alabama Posts: 8	K-x @ 1/60 has black stripe I'm not sure why but when i use my k-x in full manual, with or without a flash, if im shooting at 1/60th of a second, there is a dark line on the bottom of the exposure. This line is about 1/3rd of the frame. its just a dark under exposed section of the frame. i dont know how else to describe it. at 1/50th its fine, and 1/80 is also fine. it only does it at 1/60th/ Also tried different lenses to make sure it was the body. any suggestions? Is this the case with any other k-x's?

02-07-2011, 08:20 PM	#6
wmich New Member Join Date: Nov 2009 Location: Michigan Posts: 21	Sync problem crimespree, I have the same problem but only when I use my k-x and 360 with radio triggers(FlashWave). I do not have a problem when I use P-TTL on the hot shoes. Are you using P-TTL?

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02-04-2011, 03:53 PM	#2
enoeske Veteran Member Join Date: Jul 2009 Location: Surprise, Az Photos: Gallery Posts: 2,136	can you post one of the offending images to help us diagnose the issue? ideally one without flash and one with flash

02-04-2011, 03:55 PM	#3
KxBlaze Veteran Member Join Date: Feb 2010 Location: California Photos: Gallery Posts: 1,602	Is it there when you view the pictures on a computer or only when you view it on the camera LCD? I have heard others on here say they have had similar problems but do not remember the solution. I suggest doing a search for those threads.

02-05-2011, 05:32 PM	#4
crimespree New Member Join Date: Jul 2010 Location: Alabama Posts: 8 Original Poster	It is there only when i use a flash. I use a AF540FGZ and the first few exposures dont have it. here are a couple samples. <a href="http://smg.photobucket.com/albums/v78/less-than-zero/?action=view&current=1-601of2.jpg" target="_blank"><img src="http://img.photobucket.com/albums/v78/less-than-zero/1-601of2.jpg" border="0" alt="Photobucket"></a> <a href="http://smg.photobucket.com/albums/v78/less-than-zero/?action=view&current=1-602of2.jpg" target="_blank"><img src="http://img.photobucket.com/albums/v78/less-than-zero/1-602of2.jpg" border="0" alt="Photobucket"></a>

02-06-2011, 02:18 AM	#5
cats_five Veteran Member Join Date: Nov 2010 Location: Fife, Scotland Posts: 835	What focal length? It looks like the lens hood is shading the flash from the lower part of the scene.

02-07-2011, 08:23 PM	#7
enoeske Veteran Member Join Date: Jul 2009 Location: Surprise, Az Photos: Gallery Posts: 2,136	If you are using wireless radio triggers, its quite possible that your triggers aren't up to the task of syncing at 1/180. You may need to lower the shutter speed a bit, try 1/120 or 1/80 if the ambient isn't a problem.

02-07-2011, 08:49 PM	#8
bobmaxja Veteran Member Join Date: Mar 2010 Location: Laval, Quebec Canada Posts: 2,171	See this Video, they will explain your black section on your photo http://www.youtube.com/watch?v=hvZ6VujbhjM&feature=player_embedded#

02-08-2011, 02:56 PM	#9
Lowell Goudge Site Supporter Join Date: Jan 2007 Location: Toronto Photos: Gallery \| Albums Posts: 17,892	I had an issue like this with my K10D which had the stripe getting wider and wider as the shutter speed increased. Ultimately they replaced the shutter mirror and lens mount. Although I can't prove it, and don't recall dropping the camera, I am sure that is what happened. The trailing curtain was moving incorrectly

02-08-2011, 03:00 PM	#10
bobmaxja Veteran Member Join Date: Mar 2010 Location: Laval, Quebec Canada Posts: 2,171	If you use flash and you increase the shutter speed, the black stripe will grow. Normal the flash sync on Pentax is max at 1/180. Anything over 1/180 will show black stripe Nothing wrong with the curtain Look at the video link I attached.

02-08-2011, 03:04 PM	#11
enoeske Veteran Member Join Date: Jul 2009 Location: Surprise, Az Photos: Gallery Posts: 2,136	Originally posted by bobmaxja If you use flash and you increase the shutter speed, the black stripe will grow. Normal the flash sync on Pentax is max at 1/180. Anything over 1/180 will show black stripe Nothing wrong with the curtain Look at the video link I attached. the camera doesn't trigger the flash at speeds above 1/180th at all, so no worry about exceeding the max sync speed. still looks like a trigger sync issue -- the triggers aren't able to keep up with the camera max sync speed. Try some fresh new batteries in the flash, commander and receiver.

02-08-2011, 03:31 PM	#12
Lowell Goudge Site Supporter Join Date: Jan 2007 Location: Toronto Photos: Gallery \| Albums Posts: 17,892	Originally posted by bobmaxja If you use flash and you increase the shutter speed, the black stripe will grow. Normal the flash sync on Pentax is max at 1/180. Anything over 1/180 will show black stripe Nothing wrong with the curtain Look at the video link I attached. Originally posted by enoeske the camera doesn't trigger the flash at speeds above 1/180th at all, so no worry about exceeding the max sync speed. still looks like a trigger sync issue -- the triggers aren't able to keep up with the camera max sync speed. Try some fresh new batteries in the flash, commander and receiver. guys read the OP's post. he says with or without flash. Sounds like a sticking curtain.

02-08-2011, 03:35 PM	#13
enoeske Veteran Member Join Date: Jul 2009 Location: Surprise, Az Photos: Gallery Posts: 2,136	Originally posted by Lowell Goudge guys read the OP's post. he says with or without flash. Sounds like a sticking curtain. he seems to have amended his comments later... Originally posted by crimespree It is there only when i use a flash. I use a AF540FGZ and the first few exposures dont have it. here are a couple samples. when you say the first few frames don't have it, are you shooting in bursts? Are you letting the flash recycle fully?

02-08-2011, 03:52 PM	#14
Lowell Goudge Site Supporter Join Date: Jan 2007 Location: Toronto Photos: Gallery \| Albums Posts: 17,892	Originally posted by enoeske he seems to have amended his comments later... when you say the first few frames don't have it, are you shooting in bursts? Are you letting the flash recycle fully? Oops I missed that If it is flash and he is set to trailing curtain sync and has the flash at full power then the flash duration exceeds the time the shutter is fully open. This can also be seen at full power and max sync on leading curtain sync

04-13-2011, 12:27 PM	#15
crimespree New Member Join Date: Jul 2010 Location: Alabama Posts: 8 Original Poster	Sorry about this lapse in response. It is apparently a trigger based issue. I can however shoot at 1/180 and all over the shutter speed board with no weirdness in exposure. ONLY at 1/60th of a second. and only with a wireless trigger.