What to buy for pictures of my scope's screen?

Thread Starter

atferrari

Joined Jan 6, 2004
3,487
My cheap digital camera has no manual focus adjustment.

Trying to take pictures or record short videos of what is going on my scope's screen has failed up to now. Always out of focus.

Asking for help on this, I was advised to use a webcam (with focus manual control) or even a surveillance camera.

I have no experience at all with that.

After finding out the high prices of the cameras with focus manual adjustment I am looking for a cheap solution still allowing sharp pictures/videos.

Any reasonable concrete solution?

Gracias.
 

Georacer

Joined Nov 25, 2009
5,181
I know my family has a web camera with manual zoom. It's quite cheap, but you are bound to your PC and somewhat low quality pictures. Have you tried using a landscape or macro operation? Maybe focusing too far or too close will help.
 

Thread Starter

atferrari

Joined Jan 6, 2004
3,487
I know my family has a web camera with manual zoom. It's quite cheap, but you are bound to your PC and somewhat low quality pictures. Have you tried using a landscape or macro operation? Maybe focusing too far or too close will help.
What are the specs to look at, to decide on how bad is what I should expect?
 

Wendy

Joined Mar 24, 2008
21,906
Bill,

Better quality would not help if focus control is still auto.
Perhaps, but I have displayed photos of my oscope display routinely here. It is a matter of having done that. You are generalizing a specific problem with your camera to all cameras, which is not a valid assumption.

There is an accessory I need to make though, a shadow box. The glass from the CRT reflects the image of me taking the picture, so I need to come up with a hood arrangement of some kind.
 

Georacer

Joined Nov 25, 2009
5,181
I believe it is a standard 2Mpixel for photo and 0.8Mpixel for video. Haven't tested it for close snapshots or detailed video.
 

loosewire

Joined Apr 25, 2008
1,686
@ Atferrari,you have use the old vhs video camera,it will also record off
screen on T.V.,digital is blurry for some reason.
 

Thread Starter

atferrari

Joined Jan 6, 2004
3,487
You are generalizing a specific problem with your camera to all cameras, which is not a valid assumption.
The problem is not specific to my camera. The auto focus is measuring distance to the graticule which is some 10 to 15 mm closer thus the blurred result. No mater what camera will auto focus, all have to do the same.

When the camera is focusing there is a brief moment in the process, when the image is sharp but it does not last. The sole trick I know is to move the camera ahead while keeping the shutter button half-pressed to mantain the focus already acquired. Not easy to get good results this way.

I also tried the macro option which is somewhat better but not satisfactory (at least for me).
 

Wendy

Joined Mar 24, 2008
21,906
I personally consider this satisfactory, though it also shows what I was talking about with the light shield.

 
Last edited:

JoeJester

Joined Apr 26, 2005
4,126
Is it the camera or is it your oscilloscope settings?

The beam brightness, the background lighting, the screen graticule lighting, all could contribute to poor pictures. Is your cam mounted on a tripod?

Post a picture so we can see what your talking about.

Bill's pic is quite legible, and I see his hands and the camera in the reflection.
 

Thread Starter

atferrari

Joined Jan 6, 2004
3,487
Is it the camera or is it your oscilloscope settings?
Joe, please re read my posts. Then reason is that I have the graticule in way as so many old scopes have.

The focus is graduated wrt the graticule and not wrt the screen (which is some 10 to 15 mm behind).

While most of the times, images obtained that way could be understood, they do not look well, more to me that I can see the real one on the scope itself.
 
Last edited:

maxpower097

Joined Feb 20, 2009
816
My cheap digital camera has no manual focus adjustment.

Trying to take pictures or record short videos of what is going on my scope's screen has failed up to now. Always out of focus.

Asking for help on this, I was advised to use a webcam (with focus manual control) or even a surveillance camera.

I have no experience at all with that.

After finding out the high prices of the cameras with focus manual adjustment I am looking for a cheap solution still allowing sharp pictures/videos.

Any reasonable concrete solution?

Gracias.
I'd just grab a smartphone with a camera. You can get one with a 5MP on it for under $100 probably around $50. They focus really well, even manual focus if you hack it.
 
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