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5600HS(D) sync problem

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Post Options Post Options   Quote sybersitizen Quote  Post ReplyReply Direct Link To This Post Posted: 16 December 2018 at 21:11
Originally posted by neilt3 neilt3 wrote:

... options are ADI flash control with "D" type lenses , those with a distance encoding chip in them . First used in the film Dynax 7 , with the focused distance information from the lens , focal length , aperture and ISO etc , the camera works out how much light is needed , and that's what's given out .

Reflectivity of surfaces don't affect the exposure , but only works with direct flash , not bounce flash .

It's worth pointing out that digital ADI is actually a variation of P-TTL. Digital ADI still requires (and relies on) a pre-flash, but the subject distance is also factored in to supposedly improve the decision-making process for flash illumination. This is a quote from Sony documentation:

How ADI works

During P-TTL flash metering, the light metering sensor in the camera measures the reflected light of the pre-flash to determine the necessary level of flash brightness. During ADI flash metering, information from the distance encoder in the lens is combined with the light metering information to ensure more accurate flash brightness control.


Many of us have made a habit over the years to avoid using digital ADI because in practice it has been just as likely to make a worse decision (and also because it can only work with unmodified direct forward flash).

Edited by sybersitizen - 16 December 2018 at 21:23
 



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Post Options Post Options   Quote neilt3 Quote  Post ReplyReply Direct Link To This Post Posted: 16 December 2018 at 21:29
I rarely use flash , but when I do it normally either bounce flash if on camera , wired or wireless flash control off camera , or I use a diffuser . Non of which work with ADI .

To the O.P ;
Can you borrow another flash to try on your cameras just to rule out an issue with you camera ?
As it's with two cameras it's unlikely , unless it's how you've set the cameras up or what your doing rather than an issue with the flash .
Just something else to narrow things down .
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Post Options Post Options   Quote Phil Wood Quote  Post ReplyReply Direct Link To This Post Posted: 16 December 2018 at 23:30
I have another flash (HVLF36AM) that works on the various cameras I have tried.

The 5600 HSD fails direct or bounce.

The contacts are clean as far as I can tell (though I'm not sure a contact issue would create the behaviour I'm seeing). If I understand it correctly the flash works pretty independently in P-TTL mode once it's triggered and the triggering obviously works because it works fine in manual mode. ADI information transfer seems to be working - the flash shows distance to subject on its display.

My guess is that the sensor system that detects the flash bouncing back at the gun has failed in a way that indicates that loads of light has been received. It could be something as simple as a capacitor failure if that is how it integrates the input. A repair manual and/or circuit diagram would be really useful!
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Post Options Post Options   Quote neilt3 Quote  Post ReplyReply Direct Link To This Post Posted: 16 December 2018 at 23:44
The bit that has the sensor in it to control the flash is AFAIK in the camera .
Anything in the flashgun that might have gone bad is likely to be the PCB .

However , have a look at the service manual you can download here ; https://www.manualslib.com/manual/1378800/Sony-Hvl-F56am.html

The Minolta and Sony flash is the same unit , just the label on it changed .
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Post Options Post Options   Quote sybersitizen Quote  Post ReplyReply Direct Link To This Post Posted: 17 December 2018 at 00:45
It's possible that the pre-flash is what's malfunctioning in TTL mode. It's apparently being produced - you said you see a flash that doesn't contribute to the captured image - but maybe it's not coded or timed properly to mean anything to the TTL system, so the system never follows through. Just guesses.
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Post Options Post Options   Quote sybersitizen Quote  Post ReplyReply Direct Link To This Post Posted: 17 December 2018 at 00:51
If you want to, try the flash as a wireless remote controlled by the A77 or other camera with a pop-up flash. Try it with the flash first set to manual and then set to TTL. Not sure what that result might tell us.
 



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Post Options Post Options   Quote Phil Wood Quote  Post ReplyReply Direct Link To This Post Posted: 19 December 2018 at 15:44
I'm away from home for a few days, I'll try wireless when I get back. Meanwhile I am wondering if the pre-flash assembly is the same on my Sony flash so I could swap them to see if that is the problem.
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Post Options Post Options   Quote Phil Wood Quote  Post ReplyReply Direct Link To This Post Posted: 19 December 2018 at 15:45
Originally posted by neilt3 neilt3 wrote:

However , have a look at the service manual you can download here ; https://www.manualslib.com/manual/1378800/Sony-Hvl-F56am.html

The Minolta and Sony flash is the same unit , just the label on it changed .


Thanks - very useful.
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Post Options Post Options   Quote sybersitizen Quote  Post ReplyReply Direct Link To This Post Posted: 19 December 2018 at 23:05
Originally posted by Phil Wood Phil Wood wrote:

The contacts are clean as far as I can tell (though I'm not sure a contact issue would create the behaviour I'm seeing).

It just might.

Oddly enough, one of my 5600HS(D)s suddenly refused to work with with my A77 today ... no illumination when shoe-mounted in TTL mode, just like yours.

What I did was what I often do when I suspect a contact on something is not making a good connection: I used my tongue and licked the contacts in the flash foot. It's working fine now.
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