IR camera (for interaction)
dbini last edited by
looking at your shopping list - the camera looks good - with the right lens.Manfrotto magic arms are pretty much essential.In my experience, all those IR illuminators have a very narrow beam, with no way to control the spill. it will probably be much easier to use theatre lighting and filter out the visible light.That blackmagic box won't capture, it just converts. [this](https://www.bhphotovideo.com/c/product/892453-REG/Blackmagic_Design_bdlkulsdzminrec_Ultrastudio_Mini_Recorder.html) is the one you need if you have a spare thunderbolt port.john
Thank you very much! You spared me some hassle.
True about the spill. I am searching also something for rehearsals and tests.
Talking about this, I am bit worried about the filters as this will be prone to failure (I have already one place where its gonna be discussions with fixtures) - did you try to experiment to put IR light into the normal profile?
dbini last edited by
profiles use specific halogen bulbs. that Philips IR bulb is probably designed for therapeutic heat lamps, so not a good idea. you can get 1mm thick acrylic IR pass filters, but they're quite expensive.
@ I see...Hmmmm I thougt so. There is no workaround.
One last stupid question - auto iris on CCTV - is it good idea? Or eventually filter makes things so dark, that IRIS goes wide open either - way?
I got offered lens, with auto iris and build in IR system. I have no idea how effective is IR for theatre purposes and how will behave auto-iris.
Thanks a lot in advance.
Fred last edited by
Dont get auto iris, for tracking you want fixed manual settings
Thank you @ Fred.
I realized, that camera as 1/2.8 sensor with C mount and the widest think I so far found as zoom lens, in order to save myself a pain is 3,5 - 8,0 mm but its designed for 1/3 sensors. Do you think it will work even with this small difference, or there will be some trap in tracking at the corners?
The whole thing is bit fiddly to get it right on first time.
I was hoping for something wider going all the way to 12mm.
I feel like to send everyone who helps me a bottle whisky
And sorry - one more question. There are these IR corrected lenses for brighter images. Is this something which is good or rather contraproductive with IR tracking?
If I managed the whole system, maybe I will post somewehre info for the lowcost IR system, so people after me dont have to go through this research and its easier for them.
Fred last edited by
For tracking I get lenses here oftenhttp://www.surveilzone.com/cctv-lens/cs-mount-lens there is a lot of cheap options so it is not expensive to carry around a lot of different lenses."I was hoping for something wider going all the way to 12mm." 3,5 mm is much wider than 12mm, I dont understand what you mean.I dont think these lenses are IR corrected, some lenses have a filter to block more IR and flare, these dont, always get the IR capable lenses to IR.Until you need perfect matching lenses, reliable repeatable distortion, matching back focus or other features just stick with the cheap ones, I never saw any huge advantage, the quality is better on the more expensive ones, but if you are worried about getting the right one, buy a few cheap ones(and doubles of them) instead.
@ Fred. Thank you. I need C mount, but its ok.
I generally try to create small, flexible set ups, so I try to avoid buying too much stuff.
I mean from 3,5 all the way to 12 mm. I need to be very wide I guess, but in theatre it can change.
I suspect, that with the consideation sensor size it will be at least 10,5 - 36mm and less I need to go wider, which I am not sure is possible, that should suffice once for all.
If I got right, IR coating enhances IR light in terms of visibility and contrast, so that would be nice benefit.
I am not sure how I can use back focus effectively for tracking. Having focused everything on furthest place and use the fact that lens is so wide that everything is somehow in focus?