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Optolong L-Pro Clip Filter for Canon EOS APS-C Polar Scope Adapters knurled thumbscrew is easy toThe Optolong L Pro EOS APS C Clip is a multi bandpass filter which offers better color balance by maximizing the transmission band. The balanced transmission allows astrophotos to be taken with minimal color cast on broadband emission objects such as galaxies, reflection nebulae and globular star clusters. Optolong EOS C DSLR Clip In Filter is compatible with the following cameras: Canon Digital Rebel XS Canon Digital Rebel XSi Canon EOS 1000D Canon