Fresnel equations - s and p polarized light
NFL Films got B4 adapters for all of their S-16mm cameras a few years ago to use HD Canon zooms on S-16mm cameras, including the huge Canon "Box" zooms with incredible zoom ratios and optical stabilization.
A machine vision system consists of several critical components, from the sensor (camera) that captures a picture for inspection, to the processing engine ...
20231130 — BS EN IEC 62471-6:2023: The Standard for Photobiological safety of lamps and lamp systems - Ultraviolet lamp products.
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Other issue is some TV lenses don't bother with Diaphragms and or Focusing mounts. TV cameras can adjust the pick up sensitivity on the fly, and many have a mechanism to move the whole camera tube back and forth for focus. (removes the need for a lot of precision parts)
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Other reason these lenses are fairly cheep is that the cameras they were made for are obsolete, and so were junked, but the lens was saved. (That is actually a plus for us) but you have to select the good ones from the chaff and make sure that the backfocus is set correctly.
You need to also allow for the 16mm cameras not having an optical block. You can buy adapters that allow you to use B4 mount lenses on film cameras. http://www.abakus.co.uk/Format_Converters.htm
If you have a c-mount on your camera then there's a lot of TV lenses out there that are cheap. As somebody else mentioned there is the 1" variety which are usually more expensive but will cover Super-16. The biggest problem with them for me is not the quality of the image, but just the ergonomics of the lens. They tend to be really small, the focus and aperture rings are not convenient to turn without getting your hand in the shot. Basically some of them are not much more diameter than a large coin, so imagine trying to pull focus on that - not easy! But, if you don't need to pull focus then some of them are pretty sharp.
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One other gotcha to know, I had to move some stuff the other day and came across a box of several TV - c-mount lenses that I set aside, as they have a large back portion. It was a nice e-bay find of good looking little lenses that I had to put aside once I looked at them closely.
I bought and had a PL mount made for a 15-150 Canon 1" zoom. It works fine and covers Super 16 completely. I would respectfully disagree that they are garbage. Maybe some were, but the one I got was "old" new stock, never used, still in it's box. Works great and the footage is even better. I have used Rob Houllahan's zoom he spoke of and it a a great lens. Very sharp and fast. I would recommend looking for one of those, however it is a tank like he said and it weighs about as much as a Sherman.
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Other issue is some TV lenses don't bother with Diaphragms and or Focusing mounts. TV cameras can adjust the pick up sensitivity on the fly, and many have a mechanism to move the whole camera tube back and forth for focus. (removes the need for a lot of precision parts)
TV cameras often just have the "sensor"or Pickup tube behind the mount with no shutter, so some TV lenses extend far back into the camera. The ones I had in this box all would strike the shutter in a movie camera.
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TV lenses cover TV pickup tubes (and CCD sensors) which were at one time 1 inch, but are often 1/2 inch. A lens for a 1 inch tube will likely cover regular 16, but one intended fora 2/3 or 1/2 inch tube might be a bit tight.
1" TV Zooms cover the Super-16mm frame and then some, I have a really nice 14-140mm T1.9 1" Zoom that was adapted to Aaton mount and it covers way more than the S-16mm frame (might even cover the Blackmagic camera) and it as sharp as the converted Zeiss 12-120mm IMO. There were a few manufacturers of 1" Studio Zooms mine is a Tokina (don't laugh it is built like a tank) Zeiss had a 15-150mm in C-Mount with similar specs.
202437 — The industrial camera sensor is 6mm diagonally, similar to a 1/3" format. It requires a lens that is at least the same size to provide full ...
I have tried a Sony 16-64 and looking through the viewfinder while zooming - I notice that the lens doesn't quite cover the frame for the full zoom range.
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I have tried a Sony 16-64 and looking through the viewfinder while zooming - I notice that the lens doesn't quite cover the frame for the full zoom range.
Other reason these lenses are fairly cheep is that the cameras they were made for are obsolete, and so were junked, but the lens was saved. (That is actually a plus for us) but you have to select the good ones from the chaff and make sure that the backfocus is set correctly.
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Does anyone know if the TV lenses are inferior to lenses made specifically for 16mm cameras? The prices are low and they are made by Canon, Fuji Sony etc. who do know how to make a good lens.
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Does anyone know if the TV lenses are inferior to lenses made specifically for 16mm cameras? The prices are low and they are made by Canon, Fuji Sony etc. who do know how to make a good lens.
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TV lenses cover TV pickup tubes (and CCD sensors) which were at one time 1 inch, but are often 1/2 inch. A lens for a 1 inch tube will likely cover regular 16, but one intended fora 2/3 or 1/2 inch tube might be a bit tight.
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I've shot once with Canon TV zoom 15-150mm 2.8 in C mount, and even comparing to the old Angenieux 12-120mm it's a garbage!
I've shot once with Canon TV zoom 15-150mm 2.8 in C mount, and even comparing to the old Angenieux 12-120mm it's a garbage!