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#1
January 22nd 04, 06:09 PM
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collimating a refractor
For those of you with an adjustable lens cell, I use a waffer spark plug
gapper to get equal spacing. Works like a charm and .045 seems a good spacing all around. I suppose it would work also for an adjustable mirror cell too. 
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#2
January 22nd 04, 08:09 PM
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collimating a refractor
Depends upon what you are doing. If you are spacing the two elements then
such a thing is a good start for the collimation. However, the end of the tube isn't necessarily square with the optical axis of the optics so you need to check and adjust if necessary the optics themselves. The reflections of light from the various element surfaces is generally the right way for a lens to get the surfaces coaxial to the tube. -- Bob May Losing weight is easy! If you ever want to lose weight, eat and drink less. Works every time it is tried!
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#3
January 22nd 04, 08:09 PM
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collimating a refractor
Depends upon what you are doing. If you are spacing the two elements then
such a thing is a good start for the collimation. However, the end of the tube isn't necessarily square with the optical axis of the optics so you need to check and adjust if necessary the optics themselves. The reflections of light from the various element surfaces is generally the right way for a lens to get the surfaces coaxial to the tube. -- Bob May Losing weight is easy! If you ever want to lose weight, eat and drink less. Works every time it is tried!
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#4
January 22nd 04, 08:09 PM
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collimating a refractor
Depends upon what you are doing. If you are spacing the two elements then
such a thing is a good start for the collimation. However, the end of the tube isn't necessarily square with the optical axis of the optics so you need to check and adjust if necessary the optics themselves. The reflections of light from the various element surfaces is generally the right way for a lens to get the surfaces coaxial to the tube. -- Bob May Losing weight is easy! If you ever want to lose weight, eat and drink less. Works every time it is tried!
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#5
January 22nd 04, 08:59 PM
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collimating a refractor
"Bob May" wrote in message ... Depends upon what you are doing. If you are spacing the two elements then such a thing is a good start for the collimation. However, the end of the tube isn't necessarily square with the optical axis of the optics so you need to check and adjust if necessary the optics themselves. The reflections of light from the various element surfaces is generally the right way for a lens to get the surfaces coaxial to the tube. -- My elements are cemented together with 3 foil-like spacers at 120 deg. The elements are held down by a screw-in retainer ring. This I believe brings the lens into a symmetric position on the cell and holds it down flush to the cell body. How can one use the reflection technique? Any directions? Thanks.
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#6
January 22nd 04, 08:59 PM
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collimating a refractor
"Bob May" wrote in message ... Depends upon what you are doing. If you are spacing the two elements then such a thing is a good start for the collimation. However, the end of the tube isn't necessarily square with the optical axis of the optics so you need to check and adjust if necessary the optics themselves. The reflections of light from the various element surfaces is generally the right way for a lens to get the surfaces coaxial to the tube. -- My elements are cemented together with 3 foil-like spacers at 120 deg. The elements are held down by a screw-in retainer ring. This I believe brings the lens into a symmetric position on the cell and holds it down flush to the cell body. How can one use the reflection technique? Any directions? Thanks.
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#7
January 22nd 04, 08:59 PM
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collimating a refractor
"Bob May" wrote in message ... Depends upon what you are doing. If you are spacing the two elements then such a thing is a good start for the collimation. However, the end of the tube isn't necessarily square with the optical axis of the optics so you need to check and adjust if necessary the optics themselves. The reflections of light from the various element surfaces is generally the right way for a lens to get the surfaces coaxial to the tube. -- My elements are cemented together with 3 foil-like spacers at 120 deg. The elements are held down by a screw-in retainer ring. This I believe brings the lens into a symmetric position on the cell and holds it down flush to the cell body. How can one use the reflection technique? Any directions? Thanks.
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