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Ken,
I have been playing with the Astronomik CLS-CCD filter for a while now and whilst I am still experimenting with the camera settings and processing techniques I am encouraged by the results so far. I have attached an example image of the Crux/Carina area. Details of the image are:
- Canon 550D unmodified
- Astronomik CLS-CCD clip in filter
- 50mm F1.4 USM lens @ f4.0
- Taken from the ASNSW dark sky site at Wiruna NSW
- ISO800, 120 seconds
- Losmandy GM8 mount
- Manual guiding
- Quick processing in PS CS4 to adjust curves, colour balance, black point
I shoot both raw and large JPEG and the attached image is one JPEG so no stacking at this point. I have set the white balance to custom in the camera using an image taken of a grey card in on a clear sunny day. This is necessary to rectify the colour shift introduced by the filter. I am yet to master the stacking and processing and am experimenting with Image Plus.
Some of the stars in the image have orange halos which I believe to be caused by chromatic aberration which I have rectified somewhat by stopping the lens down but I think I may have to go down one more stop to eliminate it (unless there is a way to remove this in post processing which I am unaware of).
To me the results so far with the clip in CLS-CCD filter with an unmodified camera and encouraging as it helps in bringing out the Ha nebulosity.
Hope this helps,
Rodney
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