I have been using a HasseCVF39 digital back with 200 series and 500 series cameras for the last few months and have obtained some exceptional results. Definitely the CVF39 back has brought the V series into the digital age.
This month I started to use the digital back on a large format camera. All seemed to be going well but occasionally I got a dud image. After a bit of experimentation I managed to repeat the set of circumstances that produced the dud image. I am wondering if anyone on this forum has come across a similar problem. Would appreciate some advice on how I can narrow down or solve this problem. It could be user error ( am I doing something wrong ? ) could be hardware error or even a software/firmware problem?
The problem only occurs when photographing a very high dynamic range scene.
Using large format lens connected to the back with a sync cable.
The highlights are blown by 1/3 of a stop
http://www.j4p.com/overview.jpg
This is with a fuji 125mm LF lens 1/60sec F8 Iso 50
The digital back is set to use Flash Sync
If we look at the detail
http://www.j4p.com/fuji_125_fsync_zoom.jpg
There is a slight magenta cast to the image. Also very high luminance noise ( even at ISO 50 !! )
In comparison if we look at the same scene photographed with a 200 series camera with a 100CF lens at 1/60sec F8 Iso 50
The digital back is set to use 200 Series Sync
http://www.j4p.com/Has_cf100_200series_zoom.jpg
The image has no observable luminance noise and no colour cast.
The complete files are here for comparison
http://www.j4p.com/fuji_125_fsync_0165.jpg
http://www.j4p.com/Has_cf100_200series_0177.jpg
I have tried with several large format lens and after some time I can produce the same dud image with each lens.
The factors to make this happen seem to be:-
Very high dynamic range scene, large areas of sunshine and shadows in the scene.
Use of a sync cable between lens and digital back
I looked in the Hasselblad manual and it says there is a shutter delay menu setting which is a corrective feature which adjusts the time a little to ensure the image is read from the sensor. There is a picture of the menu and setting in the manual. Unfortunately on the actual digital back the setting is not there in the menu system. ( firmware – 256 – the latest version)
Any advice on how I can narrow down or solve this issue appreciated.
This month I started to use the digital back on a large format camera. All seemed to be going well but occasionally I got a dud image. After a bit of experimentation I managed to repeat the set of circumstances that produced the dud image. I am wondering if anyone on this forum has come across a similar problem. Would appreciate some advice on how I can narrow down or solve this problem. It could be user error ( am I doing something wrong ? ) could be hardware error or even a software/firmware problem?
The problem only occurs when photographing a very high dynamic range scene.
Using large format lens connected to the back with a sync cable.
The highlights are blown by 1/3 of a stop
http://www.j4p.com/overview.jpg
This is with a fuji 125mm LF lens 1/60sec F8 Iso 50
The digital back is set to use Flash Sync
If we look at the detail
http://www.j4p.com/fuji_125_fsync_zoom.jpg
There is a slight magenta cast to the image. Also very high luminance noise ( even at ISO 50 !! )
In comparison if we look at the same scene photographed with a 200 series camera with a 100CF lens at 1/60sec F8 Iso 50
The digital back is set to use 200 Series Sync
http://www.j4p.com/Has_cf100_200series_zoom.jpg
The image has no observable luminance noise and no colour cast.
The complete files are here for comparison
http://www.j4p.com/fuji_125_fsync_0165.jpg
http://www.j4p.com/Has_cf100_200series_0177.jpg
I have tried with several large format lens and after some time I can produce the same dud image with each lens.
The factors to make this happen seem to be:-
Very high dynamic range scene, large areas of sunshine and shadows in the scene.
Use of a sync cable between lens and digital back
I looked in the Hasselblad manual and it says there is a shutter delay menu setting which is a corrective feature which adjusts the time a little to ensure the image is read from the sensor. There is a picture of the menu and setting in the manual. Unfortunately on the actual digital back the setting is not there in the menu system. ( firmware – 256 – the latest version)
Any advice on how I can narrow down or solve this issue appreciated.