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HD video tap


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#1 thomas-english

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Posted 16 June 2005 - 12:05 PM

The only 2 jobs I have had to walk away from in failure over time have been HD gigs with faulty/incorrect downconverters .

They are in such short supply in london emergency hires often don t happen.

I want to build a video tap for the eyepiece of a camcorder (varicam/f900 etc etc). For this I intend to use one of these cheap (80 dollars) camera units you can get at maplins/radioshack

Has anyone tried putting one of these onto a camcorder eyepiece ? Any idea what lens I should use ? how should i try to attach it ? any other points to save me spunking money on bits that don't work ?

If it works very well.... maybe I could do without downconverters all together ....? saving a good few kgs off my weight.

http://www.digital-c...le_Cameras.html
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#2 Ari Gertler

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Posted 16 June 2005 - 09:04 PM

The issue with any video camera that you can try to convert to a tap is CLOSE FOCUS. All the cheap ccd mini cameras that I have seen can not focus in the 1-3 inch world...

Ari Gertler
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#3 Jason Torbitt

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Posted 16 June 2005 - 09:04 PM

Hi Thomas

I've been thinking about something similar. Teletest do a little bullet styley camera. They have a load of cables and god knows what other gadgets that I have on my shopping list. The camera has hirose and BNC connectors, ideal for our use. Description is vague though, "general purpose camera". It might be worth giving them a call for full specs and to ask the question, as it looks like it could be just the job.

Just the price of £245 to worry about...

http://www.teletest....sp?part=OZA5100

It says it's designed for their transmitter, but as far as I can see it can be powered from the sled ok (12 volts)
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#4 RobVanGelder

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Posted 17 June 2005 - 12:49 AM

In every big shopping mall and electronic mall here in Bangkok I find many (whole stores with these items only) ccd camera´s in all shapes and sizes, with or without transmitter, electronic shutters,zoomlenses and with FOCUSABLE lenses as well. They are all c-mount and sometimes the focus even comes as close as the dirt on lens.

I´m not sure which lens would be the best for a monitor. I know that one french operator uses a b/w camera like this to shoot on HD and use his TB-6 monitor
The only issue could be when the are shooting 30I or P or 24P (23.9xx), where you will see a rolling black bar.

Other things like overall focus and evenness of the exposure is a bit tricky too.

But it can work, for sure.
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#5 RobinThwaites

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Posted 17 June 2005 - 03:53 AM

Hi Thomas

Before there were down converters this was standard practice for the F900. Wrap a Sony XC999 (Pulnix in the UK) in foam and gaffer tape, unscrew the c-mount lens a tiny bit so it would close focus and then jam it in the eyepiece. The advantage is that you can engineer it to see the LEDs around the finder.

Robin Thwaites
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#6 thomas-english

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Posted 17 June 2005 - 08:50 AM

would you aim to remove theviewfinder lens and focus on the little lcd and lights .... or would u go after the lens ?

Does the viewfinder lens essentially reposition the lcd so its large and far away for focus or is it much more complicated than that? do you remember those light travel lens diagrams we did in physics
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#7 RobinThwaites

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Posted 17 June 2005 - 11:47 AM

Yes remove the viewfinder lens and hope that you can get field coverage and focus with the camera lens.
Robin
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