M33

Hi All, this galaxy is tricky and to me it shows the limiations of DSLR's over cooled CCD's. This cries for more exposure time! I used an IDAS LPS filter for this shot. While contrast is significantly deepened, the filter bleaches off the reds, so we don't see the delicate red nebulosity that wreaths the galactic arms. Maybe this filter will be a great combo with the Canon 20Da, which emphasizes the reds so much. I go through periods wondering if it is worth keeping my LPS filer, but the gain in contrasts does offset the red color loss.

Here is 8x7min with a Canon 20D at f4.5 with a 105mm refractor. The image is a magnified portion, imager scale is very small with my setup.

Ivan

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Very very nice Ivan. Hints of the true size of the structure just peeking through. That Traveller is some scope indeed.

Dan

Hi All, here is M33 with a 5" at f/4.5. What a difference one 1" of aperture makes. Exposure times were similar, and I used an IDAS filter. Nothing really changed, just increased resolution! I reduced the image quality for this posts, the acutal one is a lot better.
This is not so much an indication of the resolution differences between a 4" and 5", but the differences in the particular optical train I'm imaging from: scope-f4.5 reducer-IDAS filter-Canon 20D.

Thanks for looking!

Ivan

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