The importance of IR/UV blocking in Solar imaging
Taken by apollo lasky on April 8, 2019 @ Naperville, IL
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Today, I was doing an experiment with ultraviolet and infrared light's affect on solar imaging. I chose to use the wavelength of 393.4nm, which represents singly ionized calcium ions in the solar chromosphere. ----As you can see the affect of minimal optical density blocking; versus optical densities 3 and 5. The image quality difference is quite dramatic. --- ----- This is a home made calcium K-line filter, and the processing software was registax5.1; Each image consists of 900 frames stacked and equally sharpened to reveal the details. Uncontrolled Infrared light and Ultraviolet light, will ruin imaging data.----80mm x 1200mm telescope--- basler 1300-30gm monochrome ccd
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refractor telescope.
Posted by amplelight 2019-04-08 22:54:13
Hi,
I dont quite understand As you can see the affect of minimal optical density blocking; versus optical densities 3 and 5.
Could you elaborate ?
BR
Posted by sweiller 2019-04-09 03:19:16
The optical density of a filter determines the strength of its blocking capability. Neutral density filters for example, are rated to for their diminishing light capability. The same is true for infrared and uv blocking. Certain filters block higher degrees of light. Certain coatings on a filter can also be transparent to blue but totally opaque to red. Certain glass melts can abosorbe these rays as well. If you read the coronado manual , it will say it is blocked to greater than optical density 10. This is achieved by multiple filter elements utilizing all methods of diminishing transmission within a glass substrate. (absorption, reflection,, interference, opacity and transmission)
Posted by amplelight 2019-04-09 06:38:19
 
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