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Metalworking (rec.crafts.metalworking) Discuss various aspects of working with metal, such as machining, welding, metal joining, screwing, casting, hardening/tempering, blacksmithing/forging, spinning and hammer work, sheet metal work. |
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#1
Posted to rec.crafts.metalworking
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An optics question
To all you optics type folks,
I am converting a camera to a full spectrum camera. This mainly involves removing the IR blocking filter in the camera. This has been done. But the CCD sensor needs to be kept approximately the same distance away from the sensor in order for the autofocus to work. I have two options. Since the filter is partly made from tinted glass just removing the coating won't work. So another piece of glass the same thickness could be put in the filter's place. The other option is to make an aluminum spacer the same thickness as the filter. There is a rubber gasket that sits on the filter and that the sensor actually rests against. If I make a frame that is the same dimensions it would not block any light. I will be using the camera mostly for IR, there will be a filter at the front of the camera. Since IR light will focus a little farther away from the lens than visible light should a spacer be a little thicker than the filter? Or will it make practically no difference? Since it looks like I might need to make something I might as well as make it correctly. Thanks, Eric |
#2
Posted to rec.crafts.metalworking
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An optics question
On Wednesday, April 29, 2015 at 11:50:20 AM UTC-4, wrote:
To all you optics type folks, I am converting a camera to a full spectrum camera. This mainly involves removing the IR blocking filter in the camera. This has been done. But the CCD sensor needs to be kept approximately the same distance away from the sensor in order for the autofocus to work. I have two options. Since the filter is partly made from tinted glass just removing the coating won't work. So another piece of glass the same thickness could be put in the filter's place. The other option is to make an aluminum spacer the same thickness as the filter. There is a rubber gasket that sits on the filter and that the sensor actually rests against. If I make a frame that is the same dimensions it would not block any light. I will be using the camera mostly for IR, there will be a filter at the front of the camera. Since IR light will focus a little farther away from the lens than visible light should a spacer be a little thicker than the filter? Or will it make practically no difference? Since it looks like I might need to make something I might as well as make it correctly. Thanks, Eric You might try joining the forums at Cloudy Nights (astronomy forum) and asking in the DSLR forum. There are some there who have removed the IR filter from various cameras. Jim H. |
#3
Posted to rec.crafts.metalworking
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An optics question
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#4
Posted to rec.crafts.metalworking
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An optics question
Larry Jaques fired this volley in
: Why not just swap out the no-IR glass for an IR-only glass they use for IR cameras? Just a WAG Because he stated "all spectrum", and "...be using it _mostly_ for IR..." Lloyd |
#5
Posted to rec.crafts.metalworking
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An optics question
On Thu, 30 Apr 2015 04:54:44 -0500, "Lloyd E. Sponenburgh"
lloydspinsidemindspring.com wrote: Larry Jaques fired this volley in : Why not just swap out the no-IR glass for an IR-only glass they use for IR cameras? Just a WAG Because he stated "all spectrum", and "...be using it _mostly_ for IR..." Oops! -- "I believe there are more instances of the abridgment of the freedom of the people by gradual and silent encroachments of those in power than by violent and sudden usurpations." --James Madison, Virginia Convention, June 16, 1788 |
#6
Posted to rec.crafts.metalworking
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An optics question
On Wed, 29 Apr 2015 13:46:02 -0700 (PDT), Jim Hornaday
wrote: On Wednesday, April 29, 2015 at 11:50:20 AM UTC-4, wrote: To all you optics type folks, I am converting a camera to a full spectrum camera. This mainly involves removing the IR blocking filter in the camera. This has been done. But the CCD sensor needs to be kept approximately the same distance away from the sensor in order for the autofocus to work. I have two options. Since the filter is partly made from tinted glass just removing the coating won't work. So another piece of glass the same thickness could be put in the filter's place. The other option is to make an aluminum spacer the same thickness as the filter. There is a rubber gasket that sits on the filter and that the sensor actually rests against. If I make a frame that is the same dimensions it would not block any light. I will be using the camera mostly for IR, there will be a filter at the front of the camera. Since IR light will focus a little farther away from the lens than visible light should a spacer be a little thicker than the filter? Or will it make practically no difference? Since it looks like I might need to make something I might as well as make it correctly. Thanks, Eric You might try joining the forums at Cloudy Nights (astronomy forum) and asking in the DSLR forum. There are some there who have removed the IR filter from various cameras. Jim H. Thanks Jim, I think I'll take a look. |
#7
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An optics question
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