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Reverberation adjustment
Pocket Powerbox Advance controller
whether the image is flat in all corners and generally it will indicate the quility of the optics
repeatable focus in astrophotography
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Optolong L-PRO Filters Size:EOS-C Reverberation adjustmentL Pro Introduction Optolong L Pro (L Professional) filter is designed to improve the visibility of various deepsky objects. By selectively reducing the transmission of wavelengths of light pollutants, specifically those produced by artificial lightings including mercury vapor lamps, both high & low pressure sodium vapor lights and the unwanted natural light caused by neutral oxygen emission in our atmosphere (i. e. skyglow). Together with the highly
