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Pentax LX and Flash Question
Happy New Year!
I am now the proud owner of a very nice Pentax LX, complete with winder and the AF-280T flash. And having explored the ambient light capabilities of this fantastic camera, I have a question about using the flash balanced with ambient light. The manual says to not use the flash with anything other than 'Automatic' and 'X' settings, so my first question is, what happens if you use TTL auto flash with manual shutter settings of 1/30 and longer? My second question is, if the above is not a sensible way of using ambient light, what is the best technique for getting ambient light balanced with flash? Can the test function be used with the camera on TTL auto? Or does it just have to be on 'auto'? Can flash compensation can be carried out using the exposure compensation dial, while using the camera in manual mode? Many thanks in advance, Duncan. |
#2
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Pentax LX and Flash Question
Can the test function be used with the camera on TTL auto? Or does it
just have to be on 'auto'? I have 280T and istDL which is very different from your setup. The test function is definitely not for TTL . 280T has its own sensor and you have to switch on the test function separately. The manual says to not use the flash with anything other than 'Automatic' and 'X' settings, so my first question is, what happens if you use TTL auto flash with manual shutter settings of 1/30 and longer? For my case the answer it is TTL even if I have manual shutter setting. In your case, no harm in trying it out. Hope this can be of some assistance. Daniel |
#3
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Pentax LX and Flash Question
This would be a good question to pose on PDML.
You can see how to join the discussion at http://www.pdml.net . And I'll look forward to the answer as I'm also looking at a possible LX purchase. Collin |
#4
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Pentax LX and Flash Question
Duncan Murray wrote:
Happy New Year! I am now the proud owner of a very nice Pentax LX, complete with winder and the AF-280T flash. And having explored the ambient light capabilities of this fantastic camera, I have a question about using the flash balanced with ambient light. Great combination. The manual says to not use the flash with anything other than 'Automatic' and 'X' settings, so my first question is, what happens if you use TTL auto flash with manual shutter settings of 1/30 and longer? I'm looking at the camera and the manuals right now. Should work fine with speeds slower than X-sync. According to the manual, the camera's "automatic" setting is going to set the "X-sync" shutterspeed to 1/50 when it detects the AF-280T flash installed on the hot shoe. With the flash set to TTL auto, the camera will control the flash so that it quenches when the subject is properly exposed. A slower manual shutter speed should give the background more exposure, but the TTL is intended to balance the exposure with ambient light. The manual X-sync speed is 1/75 sec. My second question is, if the above is not a sensible way of using ambient light, what is the best technique for getting ambient light balanced with flash? I believe the flash's TTL automatic function is intended to balance ambient light with flash. Can the test function be used with the camera on TTL auto? Or does it just have to be on 'auto'? AFAIK, the LX doesn't have a TTL auto setting. There's only automatic, although I think the automatic **IS** TTL. The AF-280T has a TTL automatic function. When coupled with the LX, the AF-280T's output is controlled by the camera's auto-exposure sensor. The flash test function should work just fine. With the camera set to automatic & the flash to TTL Auto, you should also get a flash ready indication in the finder, as well as a flash confirmation. Can flash compensation can be carried out using the exposure compensation dial, while using the camera in manual mode? I believe the compensation dial only controls the exposure in automatic mode. In manual modes, it will just tell you compensation is set (red flag in viewfinder). In automatic, I expect exposure compensation should affect how the camera's exposure sensor controls the flash, but can't say for sure it will. Don't find that anywhere in the manuals for either the camera or the flash. But, I don't find where it WON'T control flash OR shutter compensation in manual either. The main thing manual speeds seem to do on this camera is give you a functional shutter from 1/2000 down to 1/75 (X-sync) if the batteries die. Many thanks in advance, Duncan. BTW, if you don't get a user's manuals with the camera, Pentax provides them in PDF format on their website. http://www.pentaximaging.com/files/manual/LX.pdf http://www.pentaximaging.com/files/m...280T_FLASH.pdf The manual is a good thing, because this camera has too many great features to remember them all all of the time. |
#5
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Pentax LX and Flash Question
Many thanks for the replies.
My overall impression from reading these replies and looking at the internet, as well as results from the camera a TTL flash can be used with 'Automatic' and X to set it to the sync speed - 1/75, and also manual speeds slower than this can be set, and the flash should still be TTL control. The test function only works on Auto Flash, and not TTL. This is probably because the camera doesn't know that you've pressed the test button, and so can't quench the flash like it would if you used the shutter. I don't have any evidence for this, but, in theory - flash compensation should be controlled by exposure compensation dial, while shutter speed will not be affected for any of the settings. This would be because the flash quenching is dependant on ISO, and exposure compensation affects the same system. What a clever camera! Duncan. |
#6
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Pentax LX and Flash Question
IIRC,
You can also insulate the back-left pin. That's the quash pin. It should allow you to use TTL with a variable flash output. Collin |
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