Quote:
Originally Posted by Bassnut
Yes, lots of detail there, excellent !.
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Cheers Fred.
Quote:
Originally Posted by marc4darkskies
Lovely Greg!! The detail is excellent - more data will smooth it out. Very nice indeed! 
That's some image scale ... 0.48 arcsec/pixel! But why did you reduce from the native CDK17's 0.63 as/p? Your sub length would need to be marginally longer at this scale than at your native F6.8 with 9 micron pixels, even considering the high QE of the SX694.
Cheers, Marcus |
Native the Trius is .32 with the reducer as you say .48 and the 9 micron 16803 is .63 and .96 with the reducer. The KAF8300 chip is native .38 and with the reducer .57. Oversampling has some advantages. One is deconvolution works better than at 9 microns. This tends to reduce the need for an AO to some degree (of course primary tight data is always senior). Greater image scale. Also the camera has lower read noise at 6 electrons versus about 12 for the 16803 so SNR tends to be higher. There is a gain, how much I let the images be the judge. Some seem better. Others are OK. I think the reducer improves the sampling a lot better. I also got the camera for my TEC180 as its perfect sampling for that scope which is handy as its also portable and I can take it to my dark site. Its also a bit less of a wind prone scope.
Additionally 2x2 binning works well with this camera as Ray has tested binning is working near theoretical levels. The KAF8300 camera also works well with the reducer and I have taken some good Ha shots with that camera in the past. I seem to be picking up more detail and I still need to gather about 10-20 hours for an ideal image so no real shortcuts there. In Ha and O111 this camera is top of the list as both are around 66% and 60% respectively. That is very high. Small wells are a consideration so I keep an eye out for bright star bleed. Also 17 inches at F4.5 and 77% QE actually burns out the core of galaxy NGC1097 in a 10 minute sub! So a lot of photons being recorded.
I am also thinking of either a 09000 chipped 12 micon camera or a 6303e 9 micron pixel camera. Mainly because I have never used a 6303e and its a largish sensor and large wells and good QE. Blooming I hope is a matter of controlling sub length or CCDstack bloom removal.
Greg.