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05-23-2014, 04:12 PM - 1 Like   #1
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Avoid CCTV Ultrak 3.5-8.0 f/1.4 len

I cannot complain since I got one of these (C-mount len) for cheap. But at any rate, this len will not work on C-mount or D-mount (I tried C-to-D mount) since it required reaaallllly small minimal distance to CMOS sensor and you will not be able to focus, unless you are making your own adapter that REALLY really close to the sensor.

All is not lost however. I am planning to use it on Raspberry Pi camera module. That module has a CMOS sensor of 9.44 full frame crop factor and when I mount it on the module it should be able to give me 3.5*(9.44/2) - 8.0*(9.44/2) or about 16.52mm to 37.76mm of equivalent zoom on Raspberry Pi at ~ f/3.2

Picture of the beast attached, also rapsberry pi camera module, and also a sample pic of it free-lensing.

If any of you guys managed to mount it on a an adapter let me know. I am also planning to mount it on a harder plastic body cap of they are selling one for pentax Q. Otherwise it is not worth it unless you like to tinker around and instead get a wide angle cine D-mount len instead.

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Last edited by rendition; 05-23-2014 at 04:23 PM.
05-23-2014, 05:30 PM   #2
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Bummer that it won't work on the Q. Would it work as a macro lens? Always looking for a small inexpensive way to do macros with the Q.

You are having fun with the Q. Keep it up.
thanks
barondla
05-23-2014, 06:21 PM   #3
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QuoteOriginally posted by barondla Quote
Bummer that it won't work on the Q. Would it work as a macro lens? Always looking for a small inexpensive way to do macros with the Q.

You are having fun with the Q. Keep it up.
thanks
barondla
Hi Barondla:

With the typical C-to-D mount it will not even focus even with macro shot. It can only work with pentax Q body cap with custom drill hole. I will post picture once I receive the pentax Q body cap.
05-28-2014, 01:19 PM   #4
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Isn't it a CS mount lens, with a 12.526mm register (flange distance) compared to 17.526mm for the (regular) C mount?

05-28-2014, 10:32 PM   #5
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QuoteOriginally posted by Mistral75 Quote
Isn't it a CS mount lens, with a 12.526mm register (flange distance) compared to 17.526mm for the (regular) C mount?
Hi Mistral75

It fits C-to-D adapter, at least the version that I had it but needed to be closer to the sensor to be able to focus. Regardless, if you can find way to do it, the picture will be sharp and wide.
05-29-2014, 03:43 AM   #6
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Since you wrote:
QuoteOriginally posted by rendition Quote
(...) this lens will not work on C-mount or D-mount (I tried C-to-D mount) since it required reaaallllly small minimal distance to CMOS sensor and you will not be able to focus, unless you are making your own adapter that REALLY really close to the sensor.
(...)
I think it could be a CS mount lens, the CS mount being that of many CCTV lenses:
  • If the lens fits the C-to-D adapter, it has a C thread.
  • CS mount has the same thread as C mount but its register is much shorter (S in CS stays for Short): 12.526mm instead of 17.526mm.
If so, to work with a Pentax Q your lens would require an adapter 5mm shorter than a C-to-Q adapter and only 3.3mm thick (the Q mount's register is 9.2mm).
05-29-2014, 06:13 AM   #7
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I have made a CS mount adapter by drilling and taping a D mount adapter to the C mount tread and used several CS lenses. I did have to add a thin shim to step the CS lens out a little form the D mount flange. The CS flange distance is 12.5mm and the D mount is 12.29mm

I would also guess your lens is CS mount
05-29-2014, 11:55 AM   #8
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QuoteOriginally posted by Mistral75 Quote
Since you wrote:

I think it could be a CS mount lens, the CS mount being that of many CCTV lenses:
  • If the lens fits the C-to-D adapter, it has a C thread.
  • CS mount has the same thread as C mount but its register is much shorter (S in CS stays for Short): 12.526mm instead of 17.526mm.
If so, to work with a Pentax Q your lens would require an adapter 5mm shorter than a C-to-Q adapter and only 3.3mm thick (the Q mount's register is 9.2mm).
Oh gotcha. Thank you for the useful infor Mistral75

QuoteOriginally posted by hnikesch Quote
I have made a CS mount adapter by drilling and taping a D mount adapter to the C mount tread and used several CS lenses. I did have to add a thin shim to step the CS lens out a little form the D mount flange. The CS flange distance is 12.5mm and the D mount is 12.29mm

I would also guess your lens is CS mount
Thank you for the clarification hnikesch

I guess the next question is there is no CS-to-Q adapter?

05-29-2014, 12:29 PM   #9
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QuoteOriginally posted by rendition Quote
Oh gotcha. Thank you for the useful infor Mistral75



Thank you for the clarification hnikesch

I guess the next question is there is no CS-to-Q adapter?
I have not found one yet
05-29-2014, 04:04 PM   #10
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Or you can make your own cap and drill the hole, or accessing to a machinery. Otherwise, you can do something like what I did to a 7-70mm f/1.8 len. I built an entire rig using materials at home. I took out the Raspberry Pi camera module len and place in the len, some glue parts, some Debian Linux part. My originally purpose was to do intensive video recording. The camera can take time-lapse 5megapixels or still picture, but it can record 1080p video resolution. What you ended up with is a an entire mini computer running on Debian Linux that is automated (running on SH script) turn on and off at certain time (15-20 hours video recording per day dumping on external hard drive at 30GB per day at full resolution)).

The len has an effective focal of ~300mm.

You can do touchscreen interface but I will leave it out for another project.

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