Quote:
Originally Posted by gregbradley
Don't you need 65mm filters for your STX16803? Or are you using something else?
Greg.
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No, I'm still using the STX16803, but with 50mm square filters you need to go to an external guider (as the internal guide chip can no longer see the sky)
The other issue with the internal guider, is very narrow band filters make finding guide stars very difficult to find.
The STX guider moves the guide chip ahead of the filter train in a similar manner as the STXL integrated guider/CFW's.
Also, while a set of 50mm square 3nm NB AstroDons are not cheap, the price of a 3nm bandpass in a 65mm square filter is eye-watering.