[AZ-Observing] Re: Faint nebulosities surrounding M42

Stopping down the aperture would surely help with blooming and saturation 
issues and would be useful when taking pictures of very bright objects.  My 
camera will do exposures of less than a second and that is short enough that 
I can shoot the trapezium with no problems, but I can't take a LRGB image of 
the moon with my F/9 scope without stopping down the aperture.

The big problem is, to get some signal from the fainter stuff relatively 
close to the bright stuff, you need a longer exposure and the bright stuff 
plays havoc with the dim stuff you're really trying to bring out.  With 
Waynes camera being non anti-blooming the blooming spikes shoot all over the 
picture cutting accross the dim areas you are trying to get signal from 
ruining the picture.  I have heard of people stacking hundreds of very short 
exposures to help with the blooming issue with varying results in these 
cases.


Jon


----- Original Message ----- 
From: "Brian Skiff" <bas@xxxxxxxxxx>
To: <az-observing@xxxxxxxxxxxxx>
Sent: Saturday, December 17, 2005 12:03 AM
Subject: [AZ-Observing] Re: Faint nebulosities surrounding M42


>>>  ...but even with 15 second exposures the trapezium shows a little
>>>  blooming with my camera.
>
>>>  ...I don't know how you can do it with a non-anti-blooming camera, 
>>> though.
>
>
>     Would there be any objection to using a small stop of, say, 2-3cm
> aperture over the telescope and use the usual short exposures for
> such cases?
>
> \Brian
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