1.25 Inch IR-Pass Filter 1¼" (685 nm) Reduce the Effects of Seeing for Planetary Photography Contrast Enhancement SV183 filterFeatures:brand new and Fully reduce viewing and enhance contrast: With digital cameras, the Pass filter works well for solar imaging, reducing viewing and improving contrast when used for and planetary imaging.The Pass 685nm filter is made from high-end glass and is multi-coated using an ion-assisted deposition to scratch resistance and central wavelength stability.The filter is light, strong metal and is machined, sandblasted, black anodized and then sculpted. The result is an ultra-thin filter with a net aperture of 26mm.Filter darkens the for sky background to moon and planetary mages at In addition to astronomical applications, ir-Pass filters can also be used for near-infrared nature photography to reveal surprising differences in skies and clouds (requiring the use of a camera sensitive to 670nm, such as as a modified DSLR webcam).The filter is located in a high-quality filter frame.Specifications:B260Size: 3.18cm/1.25inSubstrate Thickness: 1.1mmOptical Aperture: 26mmWavelength Range: 350-1100nmCut-off Wavelength: 670nmLight blocking: OD2@400-660nmfor transmission: 670nm @ for T = 50% 673-1100nm @ T> 95%Surface quality: 60/40Surface parallelism: 1/4 λParallelism: 30 inches Aviation aluminum 6061T6Thread: M28.5 x 0.6Single thread: YesPackage Includes:1 X FilterNote:Please allow 1-3cm error due to manual measurement. pls make sure you do not mind before you bid.Due to the difference between different monitors, the picture may not reflect the actual color of the item.