From: "Tim" <tjp314@pacbell.net>

Date: December 4, 2006 10:31:14 PM MST

To: Astro_IIDC@yahoogroups.com

Subject: Re: Ray - First Light

Ray:

Setting the gamma below 1.0 can help reduce the limb darkening on

Jupiter.  I've done that before, though you can also do it during

processing of the stacked result.

-Tim

--- In Astro_IIDC@yahoogroups.com, Alan Friedman <alan@...> wrote:

Hi Ray -

You should post those images -we'd love to see them.

The gamma setting can be adjusted - I have increased it up to 1.30 for 

low contrast subjects (H-Alpha solar surface in average to poor seeing) 

- It can sometimes be easier to focus with a higher contrast image. I 

don't remember setting it below 1.0- though...

Remember that when the seeing is poor you can reduce the focal length 

and keep on shooting! I think Dodi's nice full lunar disc mosaic was 

shot with 110mm scope.

best -

Alan

On Dec 3, 2006, at 12:24 PM, Ray Byrne wrote:

Hi All,

The weather in the UK in general has been awful since a gathered all

I need together to use AstroIIDC. A few UK die-hards have managed to

get up before dawn and image the rather low Saturn but they are made

of sterner stuff than me, having said that the ease of use and set-up

I have now makes this option more appealing. Over this weekend we've

had a couple of storms coming over from mid Atlantic and in between

there has at least been clear skies. Although the skies are clear

there is blustery winds (the sudden gusty sort) and the seeing has

been the worst it can get. On saturday afternoon an hour before

Sunset I noticed a gibbous moon rising and decided to "go-for-it" and

was set-up in 15 minutes.

The process was totally simple with no hurdles at all and I was

imaging features on the Moon immediately. Focusing was the only real

problem as the Moon was boiling like a "good'n", it was in constant

motion with no respite in motion at all, normally I would have

packed-

up straight away but this was all about getting used to AstroIIDC's

features and filtering with a mono camera. I found that imaging in IR

gave the best result - i.e. the live video seemed the steadiest, but

the resultant stacked and processed TIFs were pretty poor.

There was something I noted, it has been suggested that one should

leave the gamma setting at 1.00 but I wanted to have a contrast to

the movies that didn't have crater wall highlights fully saturated

(i.e. totally white) so I played with the setting and got better

results by bring it down to the left (under 1.00). The more pleasing

images I see from the likes of Alan F for example seem to have a less

dramatic contrast that looks far more natural and this is my goal.

I wont waste your time or the group's disc-space with my images but

if you are curious email me off list and I'll send you a sample:

ray[at]in4media[dot]co[dot]uk

To sum up - lovely easy to use software that "gets out of the way"

which allows me to work in a very familiar environment I love Macs (I

own 6 I've kept some old ones like the little Mac Classic, 1st gen.

iMac and the G4 I'm writing this on plus the family have an iPod each

so that's 4) to be honest apart from the seeing I couldn't be happier

Clear skies and good seeing to you all

Ray Byrne