Luminous Landscape Forum

Equipment & Techniques => Medium Format / Film / Digital Backs – and Large Sensor Photography => Topic started by: rueyloon on December 17, 2007, 03:56:50 am

Title: what is going on
Post by: rueyloon on December 17, 2007, 03:56:50 am

what's going on ?

the first photo was shot at 0.5 secs, the other was at 1 sec.

I've seen this only after alot of shooting or after a burst of shots
when using my old Kodak pro back.

How do I overcome this ?!?!?

is this a defect ? or considered as not performing within specs ?

cheers

Title: what is going on
Post by: eronald on December 17, 2007, 04:11:34 am

Better be more explicit about what you consider the images should look like ....

Edmund

Quote

what's going on ?

the first photo was shot at 0.5 secs, the other was at 1 sec.

I've seen this only after alot of shooting or after a burst of shots
when using my old Kodak pro back.

How do I overcome this ?!?!?

is this a defect ? or considered as not performing within specs ?

cheers
[a href=\"index.php?act=findpost&pid=161175\"][{POST_SNAPBACK}][/a]

Title: what is going on
Post by: rueyloon on December 17, 2007, 04:25:05 am

Quote

Better be more explicit about what you consider the images should look like ....

Edmund
[a href=\"index.php?act=findpost&pid=161183\"][{POST_SNAPBACK}][/a]

they are are of the same scene, one at 0.5 sec exposure, the other at 1 sec exposure.

Title: what is going on
Post by: eronald on December 17, 2007, 04:28:15 am

Quote

they are are of the same scene, one at 0.5 sec exposure, the other at 1 sec exposure.
[a href=\"index.php?act=findpost&pid=161186\"][{POST_SNAPBACK}][/a]

Is this your old Kodak back, or some other MF back ? Which model ?

Is it repeatable or occasional ?

Edmund

Title: what is going on
Post by: Murray Fredericks on December 17, 2007, 04:34:08 am

This looks like what happens to me when the cable starts to fail that syncs the MFDB and the flash socket of the camera.

Murray

Title: what is going on
Post by: rueyloon on December 17, 2007, 05:18:27 am

Quote

This looks like what happens to me when the cable starts to fail that syncs the MFDB and the flash socket of the camera.

Murray
[a href=\"index.php?act=findpost&pid=161188\"][{POST_SNAPBACK}][/a]

I believe the thing I'm seeing is "bucket overflow" or something, but at 1 second ?!?!?

This is the aptus 65


How does a sync problem causes a streaking effect ?

Title: what is going on
Post by: alexjones on December 17, 2007, 05:19:06 am

Looks like a cable going bad or an exposure setting that is set up wrong.  I don't know the Aptus software but in Flexcolor with an Imacon, if you set the exposure on the lens longer than the exposure setting in the software you get a similar problem (not as bad as this one).  My thought is start replacing cables or even your firewire. Hope it helps.

Title: what is going on
Post by: alexjones on December 17, 2007, 05:21:02 am

The streaking effect can be the data being pulled off the chip before the exposure is done.

Title: what is going on
Post by: rueyloon on December 17, 2007, 05:32:21 am

thanks !

looks like you guys are right.

This is only happening with one of my copal press shutter. (which I just got off ebay)
The other shutters are ok.

another to add to the knowledge base

cheers

Title: what is going on
Post by: alexjones on December 17, 2007, 05:37:53 am

Great!