DIY Telecine Question

[rlorenz2]

Does it help to add a ir/uv filter before the ccd camera? if so what will it improve on the final image? I am using a led as the light source.

[Mitch Perkins]

Does it help to add a ir/uv filter before the ccd camera? if so what will it improve on the final image? I am using a led as the light source.

Interesting question. You could try inserting the filter while running a test reel and see immediately what results.....

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For longer, more involved posts, select all your words and copy them; if your post doesn't appear (it will), you can just paste rather than re-writing everything....

Mitch

[granfer]

The CCD camera should already contain such a filter, but there is no reason why you shouldn't add a second one. Depending on the quality of the built in one, there may be an increase in contrast and sharpness of the captured image.
Just a tip though... because of their size external filters can be expensive. An admirable substitute is the "heat glass" from a slide projector or enlarger. Borrow one and try it; you can always put it back if it doesn't improve the picture!
Granfer

[rlorenz2]

Thats what I would be looking for an increase in sharpness because I have a machine vision CCD camera I would like to get the best image out of it. I am just wondering if anyone is using this filter or not. thanks

[granfer]

The increase in sharpness is likely to be only marginal if the built-in filter is doing its job. If the camera is of machine vision quality, the existing filter is likely to be of the highest quality. Adding an extra filter will not increase the RESOLUTION, of course.

[Mitch Perkins]

I did a little reading on the topic and it seems LED sources do not emit infra red. I don't think they emit UV either, so......

Generally, more filters = less resolution.

Not.

Mitch

[christoph]

hiya,
we've done some tests about this...
generally speaking it helps a little to have an extra IR filter if you use a halogen source, but it doesnt make a difference with LEDs since they dont emmit IR wavelengths.

++ christoph