Re: Refractors vs. binoculars
- From: Tom Rauschenbach <tomsusenet@xxxxxxxxxxxxxx>
- Date: Tue, 14 Feb 2006 23:45:03 -0500
On Tue, 14 Feb 2006 20:25:52 -0800, Doink wrote:
The stars that I think ( or thought before your post) where the Trapezium
had the right shape. Granted, I was seeing about three, maybe four, as
opposed to the seven or better I see with the 8 inch SCT
7 or better stars in the Trapezium? You'd better recheck your targets.
Were you seeing CA with your 8" SCT?
There is NO WAY you're seeing the entire belt, sword AND resolving the
Trapezium with a pair of binoculars. I think you might be trolling....
You are correct. I never said I did all of those things in a single
view.
Add me to YOUR killfile...
Done.
Doink
"Tom Rauschenbach" <tomsusenet@xxxxxxxxxxxxxx> wrote in message
news:pan.2006.02.15.04.07.41.688181@xxxxxxxxxxxxxxxxx
On Tue, 14 Feb 2006 19:36:54 -0800, Doink wrote:
I've never seen chromatic aberration in M42 with any telescope---I
also do
not think you're seeing the entire belt and M42 AND resolving the
Trapezium.
You're probably seeing the stars of NGC 1977 and thinking they make up
the
Trapezium. But I'm glad you're happy with your binoculars. That's all
that
matters. Looking forward to your report on the Horsehead!
Now now. No need to be nasty !
The stars that I think ( or thought before your post) where the
Trapezium had the right shape. Granted, I was seeing about three,
maybe four, as opposed to the seven or better I see with the 8 inch
SCT, but the seeing was much better tonight too. And I did acknowledge
that I thought I might be looking at something else.
But that's all beside the point.
The real question was about chromatic aberation and why binos seem to
suffer less from it than refractors with no prism.
Your remark about the horsehead was simply uncalled for. May I suggest
that you put me in your kill file ? Then you won't have to deal with
people like me.
Doink
"Tom Rauschenbach" <tomsusenet@xxxxxxxxxxxxxx> wrote in message
news:pan.2006.02.15.03.28.35.594524@xxxxxxxxxxxxxxxxx
I just got a pair of Oberwerk 11X70 binoculars on a decent mount.
Orion's belt just fits in the field of view and the sword is
magnificent, with the Trapezuim stars easily visible (unless I am
sorely mistaken). But I notice that the amount of CA is a lot less
than what I've seen in Acromatic refractors. I can't say that I've
ever used an APO. But I have to wonder why the performance of
binoculars seems to beat simple refractors. I think I understand
that the central obstruction of my SCT costs me a lot of contrast,
but the lack of of wierd color effects in the binos puzzles me.
Is this just my own ignorance and inexperience or is there something
in binocular optics that saves them from this ?
I'm thinking at a pair of 22X100 binos would be a better bet for a
grab and go scope than a 4 inch refractor and a lot cheaper. But
that seems economicaly wrong to me.
Is there something going on here that I'm missing ?
.
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- From: Tom Rauschenbach
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