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Old 09-01-2013, 02:22 PM
DJT (David)
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Join Date: Nov 2011
Location: Sydney
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Small hijack so apologies but Alistair, I assume that to do narrowband with an OSC I still need a filter wheel and filters? I ask because at the moment I us a HA clip in filter with the DSLR which means I can image well from Light Polluted Sydney so would want to see what could be viable with an OSC. Or is there a screw in HA filter type option that does away with the full FW setup?

Quote:
Originally Posted by alistairsam View Post
I would suggest a cooled CCD as well.
I started off with a DSLR and still use it sometimes, but I much prefer my OSC CCD, I find that there is more to play with in an image in terms of processing and the low noise also helps in processing.

There are people who've taken some really nice images with cooled dslr's. although the difference in the dynamic range between 12bit and 16bit is debatable, a cooled ccd does make sense, you don't have to worry about ISO, just exposure length.
you have to get your head around the concept of stretched vs unstretched images but its not hard.
narrowband will require much longer exposures with an OSC, but can be done.
I went with an OSC because I could image 3 or 4 targets in one night, whereas with a mono, it'd take 4 times as long, albeit with better results.
with temperature measurement and regulation, in theory, you should be able to take your darks at home.
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