IR Cut 1,25 filter 1,25'' filters opinie


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IR Cut 1,25" filter
 
 
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IR Cut 1,25\" filter
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An excellent filter that cuts the infrared spectrum in the spectrum of light and ultraviolet. The filter has a 1.25 "filter thread on both sides of the luminaire, thanks to which it can be combined with other filters in this standard.The filter surfaces meet strict quality tolerances, while the dielectric coatings guarantee scratch resistance and stability Filter characteristics over time.
When combined with a red filter, the IR Cut filter can raise the contrast of the CCD chip by 500%, thus enabling excellent images of the H-II area.

Recommended applications:
CCD and CMOS chips are sensitive in the UV and IR areas (ultraviolet and infrared), while lenses for telescope lenses are not well corrected outside the visible spectrum, therefore the contrast of images without an IR filter can be lowered.

Fixing: through 1.25 "filter thread





(measurements on the Varian Cary 100 spectrophotometer, July 2015)




Noteworthy

Noteworthy: IR/UV cut filter is considered a must be filter in most refractors. It will counteract so called "star bloating", which is due to increasing chromatic aberrations on the fringes of the visible spectrum. Especially important for ED/APOs, but also recommended for reflectors utilizing dedicated correction lenses, like coma correctors etc.
 
In any case this inexpensive filter is an easy way to cover a camera sensor or even better a DSLR mirror and sensor. It makes cleaning easier and maintenance less required. Also, a typical DSLR in a reflector... is simply open to the outside world.
 
Many forums and posts on the internet will tell you that "you should use an IR cut filter whenever you are not using other narrowband or multi-band filters".
 
As an example a great comparison screenshot from the equally great ZWO ASI FB group, taken with an apochromatic refractor.
 


 
 
(credit: Carl Björk @ZWO ASI FB group)
 
Happy star-hunting and clear skies!


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