Hutech IDAS-D2 Filter Test

The 2″ IDAS-D2 LPS filter for use with my William Optics Zenithstar 61 refractor telescope with a Canon 5D MkIV camera.

This is a quick play using the IDAS-D2 filter on the Canon 5D MkIV camera and a Canon 100mm macro lens to see what the colour cast was like in diffused daylight.

The filter bandwidth rejection ranges can be seen below;

Astro Hutech IDAS-D2 LPS Transmission graph
Image #1 with no filter, profiled in LR and WB set at 6500k  using the middle grey colour patch
Image #1 with no filter, colour profiled in LR and WB set at 6500k  using the middle grey colour patch
Image #2 with IDAS-D2 LPS filter, LR profile from image #1 used and WB kept at 6500k to show the natural colour cast of the filter
Image #2 with IDAS-D2 LPS filter, LR profile from image #1 used and WB kept at 6500k to show the natural colour cast of the filter
Image #3 with IDAS-D2 filter, LR profile from image #1 used and WB adjusted to 11000k automatically in LR using the middle grey colour patch, it failed to fully correct the colour cast
Image #3 with IDAS-D2 filter, LR profile from image #1 used and WB adjusted to 11000k automatically in LR using the middle grey colour patch, it failed to fully correct the colour cast

For info, I used a standard M58-M48 stepdown ring to mount the filter to the Canon macro lens and I think that configuration will work for normal DSLR night photography with the Canon lens without any significant vignetting.

In the ‘real’ world the IDAS-D2 filter is performing very well

The Veil Nebula – Canon 5DMkIV and William Optics Z61 refractor with Flat61A flattener on a SkyGuider Pro

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