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Sun Shade Origin

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Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: July/14/2005 at 21:59
HU100 View Drop Down
Optics GrassHopper
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Can anyone tell me the original use for Sun Shades.  I have a kill flash for my Aimpoint ML2 and I thought about buying a screw in for my SS 10x40, but after reading some posts on the subject, I may just stick with my Sun Shades.  Were Sun Shades designed to mask objective glint or did they serve some other target shooting purpose?
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: July/15/2005 at 08:38
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Shading the objective lens and blocking out barrel mirage are the only purposes I have ever heard it used for. The kill flash has the same sun blocking affect without having to extend the length of the scope. The kill flash also breaks up the reflection objective lenses put off.

Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: July/15/2005 at 08:56
Dale Clifford View Drop Down
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The first shades I am aware of are from the civil war. The were used to stop stray light, light not parallel with the axis of the scope, which cause color shifts in the images because of the low glass quality. (astigmatism and apochromatic shifts). In the net effect they do somewhat the same thing as an iris in a camera lense (and the eye) by "stopping down" and thus increasing the depth of field. When rapid shooting became possible it was found that a long one would allow barrel heat to flow up and around it thus preserving the image. The diffraction grating used "kill flash" accomplishes the same thing with many little holes,(except increase depth of field). I use thin wall PVC and make them to the end of the barrel. With todays lens coatings and the quality the roles of the shades have somewhat reversed, orginally to stop glint now for mirage. About 15 years ago Burris made varmit scopes with a regular iris built into the objective which increased depth of field dramatically, but could be stopped up for low light. Thus shades and devices were not needed (unless you call this a device). The scope worked great and was way ahead of scope think for those days (now even)--wish I had never traded it. I am uncertain why they discontinued it- probably market forces.

Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: July/15/2005 at 12:08
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Optics GrassHopper
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Joined: July/14/2005
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Thanks guys.  I now have a much better understanding of shades. 
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