Posts Made By: Jim Thommes

Floyd,
Looks real nice. Hold up real well at the higher resolutions.

Charlie,
Nice M101. I like what you and Floyd are doing. It may be interesting to see even a few more evolutions of the image.

Thanks for the comments folks.

Charlie,
On a scale of 128, Red -114, Grn -128, Blu -141. But I have to say, I did push up the blue a bit further on the nebula (using a star mask).

Wow, Nicely done Rolando.

Very Nice Dan. I will never again feel bad about processing data 4 months after
taking it.

Hi Tyler,
Nice extended nebulosity. Looks like the extended portions are OIII?. What data set did it show up in? Blue or OIII? Also, how did you combine the 5 data sets? Did you use one as a Luminance layer, or did you just mix the Ha / OIII into the RGB data? It look like you spent three times the time on the Ha and OIII as you did on the RGB's, so I'm guessing you had fair detail in the Ha and OIII.

Tyler, David,
Thanks for the comments.

David,
I still have and use my Artemis285. The Art is interline and the 8300 is full frame. The 8300 wells are smaller though. So I kind of expected an increase in signal level based on full frame, but a decrease due to smaller well size / capacity. I think that a sensitivity comparison is about a push. The 8300 has a higher number of warm pixels than the Art with the Sony chip - I expected that.

So far, I have been using 1-1/4 inch filters on the 8300 - its not bad. The vignetting is not too bad (but I have mounted the filter wheel as close as possible). A flat set or even a pseudo flat works well - most of my images on the 8300 have not been cropped beyond a few percent needed to eliminate where RGBs are not aligned on the edges.

I also do some work with a DSLR. I found the 8300 to be a little like the DSLR except for the Mono data aspect (and, of course, a significant increase in sensitivity and S/N). The back focus is shorter than the DSLR (even with filter wheel) but longer than the Art.

Overall, I am pretty happy with the 8300. It is the first camera I reach for. I will use the Art or DSLR on a second setup while the 8300 is pumping out data on my primary setup.

Thanks for the comments folks.

Thanks for the comments guys.

Cool image Maciej. I am wondering if you might have red clipped a bit on the brightest part of the nebula.