Luminous Landscape Forum

Equipment & Techniques => Cameras, Lenses and Shooting gear => Topic started by: roskav on October 08, 2007, 02:28:08 pm

Title: Black areas with Hasselblad 500 series
Post by: roskav on October 08, 2007, 02:28:08 pm
Hi there just wondering if anyone has had similar experiences with the Hasselblad 503cw.  This with a Leaf back and 80mm CF lens .. happened on about 6 shots out of 130 .. these ones were being shot in quick succession.  File is a bit of a dog to show the difference in the dark areas.  Any idea of what the problem might be?

Ros
Title: Black areas with Hasselblad 500 series
Post by: roskav on October 08, 2007, 02:29:39 pm
Ah ha .. just realised ... the shutter speed was an 8th of a sec .. I must have been releasing the button too quickly.. but why only on the left?

R
Title: Black areas with Hasselblad 500 series
Post by: mahleu on October 08, 2007, 03:08:53 pm
Quote
Ah ha .. just realised ... the shutter speed was an 8th of a sec .. I must have been releasing the button too quickly.. but why only on the left?

R
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Seems very strange as it's on the left. The auxilary curtain is an up and down mechanism. To hazard a guess, I would say one or more of the aperture blades are sticking.
Title: Black areas with Hasselblad 500 series
Post by: roskav on October 08, 2007, 05:45:01 pm
Hmm why then the rectangular shadow? ... surely it would reflect the angles of the blades... R
Title: Black areas with Hasselblad 500 series
Post by: Misirlou on October 09, 2007, 01:11:30 pm
Could it be part of the secondary shutter mechanism? In a 500C, there is a device inside the camera body that is independent of the shutter in the lens or the moving mirror. Not sure if a 503 has that or not.
Title: Black areas with Hasselblad 500 series
Post by: mahleu on October 10, 2007, 06:40:24 am
Quote
Could it be part of the secondary shutter mechanism? In a 500C, there is a device inside the camera body that is independent of the shutter in the lens or the moving mirror. Not sure if a 503 has that or not.
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The secondary shutter moves up and down, not side to side.

Were you using a lens hood when you took this? If so was there a light which was able to shine directly on a portion of your lens?
Title: Black areas with Hasselblad 500 series
Post by: roskav on October 10, 2007, 07:53:06 am
Hi there

I was using a Lee Filter Hood ... but there are just six from the set of say 25 taken from this position on a tripod .. the ones with this problem were all consecutive ... I might have moved it slightly ... but would that produce black areas? ... (There is always a bit of stray light coming from somewhere on stage) ... Could it have been electromagnetic interference from a mobile phone on the chip maybe? (Never heard of that kind of thing before though)

Ros

PS here's the sequence... first file has one example .. and second has a lot... files are lightened to show the black areas.

Ros