Did someone already tested a telescope as "super-tele-lens"? at DVinfo.net

Stefan von Halenbach · August 11th, 2008, 08:58 AM

As i have read, it is possible to put a c-mount lens connector on the head of the SI-camera, it should be possible with a T-2 to c-mount adaptor to use your newtonian scope as cheap lens. The image has to be swapped horizontally,though.

Did someone already tried this? Is the picture bright enough on daylight? Could you post an example picture?

Bob Hart · August 11th, 2008, 05:16 PM

Consumer scopes might not be sharp enough.

That level of magnification also brings with it problems of haze diffusion and softness.

I've tried the MTO 1084mm f11 mirror telephoto which was available with a C-Mount on a CP16 and Bolex cinecamera, also 2/3" consumer video cam circa 1983.

The image was distinctly soft in those formats, sharper with 35mm.

The optical path of the MTO is described as "Maksutov-Cassegrain", not "Newtonian", which might perform better.

This frame grab is from a 35mm adaptor with this lens.

http://www.dvinfo.net/media/hart/agusmto3.JPG

The adaptor was capable of resolving to about 700 TV lines at that point of development and is not representative of what the SI2K offers.

Stefan von Halenbach · August 12th, 2008, 04:28 AM

Thank you for replying!

I thought to use the scope for the near field (3-12 meters) to have the DOF of a 35mm camera. Anyway, thank you for your example photo. It clearly shows the dust in the air. For such a far shoot, you usually have to wait just after the rain.

Stefan

August 11th, 2008, 08:58 AM	#1
Stefan von Halenbach New Boot Join Date: Aug 2008 Location: Frankfurt Germany Posts: 11	Did someone already tested a telescope as "super-tele-lens"? As i have read, it is possible to put a c-mount lens connector on the head of the SI-camera, it should be possible with a T-2 to c-mount adaptor to use your newtonian scope as cheap lens. The image has to be swapped horizontally,though. Did someone already tried this? Is the picture bright enough on daylight? Could you post an example picture?

August 11th, 2008, 05:16 PM	#2
Bob Hart Inner Circle Join Date: Dec 2003 Location: PERTH. W.A. AUSTRALIA. Posts: 4,477	Consumer scopes might not be sharp enough. That level of magnification also brings with it problems of haze diffusion and softness. I've tried the MTO 1084mm f11 mirror telephoto which was available with a C-Mount on a CP16 and Bolex cinecamera, also 2/3" consumer video cam circa 1983. The image was distinctly soft in those formats, sharper with 35mm. The optical path of the MTO is described as "Maksutov-Cassegrain", not "Newtonian", which might perform better. This frame grab is from a 35mm adaptor with this lens. http://www.dvinfo.net/media/hart/agusmto3.JPG The adaptor was capable of resolving to about 700 TV lines at that point of development and is not representative of what the SI2K offers. Last edited by Bob Hart; August 11th, 2008 at 05:19 PM. Reason: added URL

August 12th, 2008, 04:28 AM	#3
Stefan von Halenbach New Boot Join Date: Aug 2008 Location: Frankfurt Germany Posts: 11	Not too bad for a hazy day Thank you for replying! I thought to use the scope for the near field (3-12 meters) to have the DOF of a 35mm camera. Anyway, thank you for your example photo. It clearly shows the dust in the air. For such a far shoot, you usually have to wait just after the rain. Stefan