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Date: 05 Oct 2006 20:33:38
From: Ross
Subject: 102 SLT vs 100mm Starseeker vs 100mm Astroview vs ??
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Hello,
How many versions of this ~100mm ~f6 ota/scope are there? Are any of
them better or worse than the others?
I took a look through the 102 SLT at my local astronomy store tonight.
The limb of the nearly full moon showed a bit of purple using a 5mm
radian (132x) but to my unexpert eye it really wasn't bad. As the
scope cooled down and the moon rose higher, the purple fringe improved
greatly to the point where I had to really look for it to see it.
On the other hand Arcturus thru the same eyepiece was a blob of green
and purple, at least before the scope cooled down. I am assuming this
was due mostly to atmospheric conditions and cooldown. We were set up
in the asphalt parking lot of the store looking across a busy street
with plenty of light pollution. Unfortunately the patchy clouds didn't
give me many targets to test with later in the session. The limb of the
moon should be a better test of chromatic abberation shouldn't it?
FYI, I also have an 8 inch f6 dob and a c-5 sct. I'm looking for a grab
and go computerized scope that I can use from my suburban back yard. :)
Thanks in advance,
Ross
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Date: 06 Oct 2006 18:52:35
From: Don't Be Evil
Subject: Re: 102 SLT vs 100mm Starseeker vs 100mm Astroview vs ??
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There is a 130mm reflector version of the SLT.
Atmosphere and tuibe currents will make stars shake, wobble, blur, etc.
but not show funny colors. That's CA.
Greg
Ross wrote:
> Hello,
>
> How many versions of this ~100mm ~f6 ota/scope are there? Are any of
> them better or worse than the others?
>
> I took a look through the 102 SLT at my local astronomy store tonight.
> The limb of the nearly full moon showed a bit of purple using a 5mm
> radian (132x) but to my unexpert eye it really wasn't bad. As the
> scope cooled down and the moon rose higher, the purple fringe improved
> greatly to the point where I had to really look for it to see it.
>
> On the other hand Arcturus thru the same eyepiece was a blob of green
> and purple, at least before the scope cooled down. I am assuming this
> was due mostly to atmospheric conditions and cooldown. We were set up
> in the asphalt parking lot of the store looking across a busy street
> with plenty of light pollution. Unfortunately the patchy clouds didn't
> give me many targets to test with later in the session. The limb of the
> moon should be a better test of chromatic abberation shouldn't it?
>
> FYI, I also have an 8 inch f6 dob and a c-5 sct. I'm looking for a grab
> and go computerized scope that I can use from my suburban back yard. :)
>
>
> Thanks in advance,
> Ross
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Date: 07 Oct 2006 10:03:34
From: Bob G.
Subject: Re: 102 SLT vs 100mm Starseeker vs 100mm Astroview vs ??
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I use a Celestron 8i as my main scope... But I picked up an Orion 100
EQ on clearance not that long ago .
"Grab and Go" effort is honestly about equal... only advantage the 100
mm has is that it is not computerized so I do not have to drag out the
power source... weight (assembled, on the tripod is within a pound
between the two) and the bulk of both are pretty close.. set up times
are faster only because for visual use the Astroview does not require
any time to put it down facing roughtly north...and cool down times
are not a concern (in my case) as I keep my scopes in an unheated
building and set them up about an hour before I want tro use them.
The "purple haze' (CA) honestly does not bug the daylights out of me
but using a Minus Violet Filter really cuts it down so its even less
of a bother.. to me CA is something I can live with your milage may
differ greatly however
Have not really played with the Astroview all that much as I do not
really have many EP that match its 600 mm FL (most of my EP's were
purchased for my 2035 mm SCT ... Just could not pass up the clearance
price, But so far I would not really call it a grab and go scope...
Bob G.
On 5 2006 20:33:38 -0700, "Ross" <rbartho@msn.com > wrote:
>Hello,
>
>How many versions of this ~100mm ~f6 ota/scope are there? Are any of
>them better or worse than the others?
>
>I took a look through the 102 SLT at my local astronomy store tonight.
>The limb of the nearly full moon showed a bit of purple using a 5mm
>radian (132x) but to my unexpert eye it really wasn't bad. As the
>scope cooled down and the moon rose higher, the purple fringe improved
>greatly to the point where I had to really look for it to see it.
>
>On the other hand Arcturus thru the same eyepiece was a blob of green
>and purple, at least before the scope cooled down. I am assuming this
>was due mostly to atmospheric conditions and cooldown. We were set up
>in the asphalt parking lot of the store looking across a busy street
>with plenty of light pollution. Unfortunately the patchy clouds didn't
>give me many targets to test with later in the session. The limb of the
>moon should be a better test of chromatic abberation shouldn't it?
>
>FYI, I also have an 8 inch f6 dob and a c-5 sct. I'm looking for a grab
>and go computerized scope that I can use from my suburban back yard. :)
>
>
>Thanks in advance,
>Ross
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