Uses of a DSLR for astrophotography

Started Nov 3, 2012 | Discussions thread
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Astrophotographer 10 OP Senior Member • Posts: 6,880
Re: Uses of a DSLR for astrophotography

Gary Honis mod is removing the AA filter in front of the 350D, 20D type Canon's and installing a Baader UV/IR cut filter or Edmunds Optics clear glass (same thickness). 20Da, 60Da are more of a AA filter that has been tuned to allow more Ha light to pass where it is normally blocked.

I think the main difference would be the 20Da and 60Da would work fine for terrestial shots as well whereas the modded one has a bad red bias (with clear glass the red bias is very strong and makes the camera useless without a correcting filter like Xnit CC1 filter).

With the Xnite CC1 filter colour was restored to close to normal. Not sure about later Canon models for modifications as they become more complex with dust shakers etc.

Greg.

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