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Old Monday 23rd January 2017, 23:51   #1
maico
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Canon 18x50 IS review question

I was reading the review on scopeview and was surprised the amount of time the IS seemed to take in some situations.
Does the 10x24 IS L have quicker or more sophisticated electronics ?

http://www.scopeviews.co.uk/Canon18x50.htm
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Old Tuesday 24th January 2017, 02:40   #2
Theo98
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Quote:
Originally Posted by maico View Post
I was reading the review on scopeview and was surprised the amount of time the IS seemed to take in some situations.
Does the 10x24 IS L have quicker or more sophisticated electronics ?

http://www.scopeviews.co.uk/Canon18x50.htm
Yes. My 10x42L IS settles down to a perfectly sharp and jitter free FOV (within 1 second) once I have my subject focused in and have steadied my hold. If I start viewing non-IS, get a sharp focal point established Then engage the IS, the FOV and subject locks in almost immediately!

Ted
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Old Tuesday 24th January 2017, 15:49   #3
Binastro
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Thanks for the Canon 18x50 IS review link maico.

There are some mistakes.
The IS differs on different models.
The 10x42L is listed as waterproof, the 50mm water resistant.
My 15 year old 18x50 doesn't take 20 seconds ever. The new ones might.
You have to release the IS on mine at the end of prism travel and then reengage. Newer ones maybe different.

The Zeiss 20x60 is considerably better.

The old Zeiss 15x60 considerably brighter.

The reviewer has better eyes than I have.
He sees 4 trapezium stars easily.

There were a few other errors.

I make the field 3.85 deg not 3.7 deg.

Last edited by Binastro : Tuesday 24th January 2017 at 15:54.
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Old Thursday 26th January 2017, 13:35   #4
edwincjones
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"Do you really need a scope......................Canon 18x50s are....recommended"

How do you compare the Cannon's vs an equal quality 65mm spotting scope at 15-20x?

I have tried to replace the scope with a pair of miyauchi 22x60 binoculars;
but the image was dim and reach was limited.

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Old Thursday 26th January 2017, 14:37   #5
Binastro
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A scope on a tripod is almost always better, except possibly a Zeiss 20x60 or Takahashi 22x60.

A 65mm scope on a tripod should be better than the 18x50 IS.

I am surprised the Miyauchi 22x60 wasn't really good. They have a good reputation.
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Old Friday 27th January 2017, 00:52   #6
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I agree with Binastro, a scope on a tripod (or similar power binocular on a tripod) will be better. I have 10x30 and 15x45 IS and my 60mm spotting scope on a tripod is superior for daytime use. The main advantages of an IS binocular are the closely related issues of portability and mobility, as in no setup.

I used to bring a small refractor and tripod on vacation for astronomy, until I got the 15x45 IS. Then I realized that unless the trip was predominantly for astronomy, bringing the 15x45 give me enough reach that it wasn't worth the hassle of packing and hauling telescope, tripod, and accessories.

The tradeoff would seem similar for birding, except that small spotting scopes with lightweight tripods are considerably lighter and more compact than their astronomical counterparts.

Alan
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Old Wednesday 15th March 2017, 15:54   #7
Binastro
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2017 March 14 23.38UT
Used 18x50 IS to easily see all 4 Jupiter moons, immediately identified correctly. They were surprisingly bright.

Our 2 days past full Moon's limb was 1.9 degrees away from Jupiter.


What was interesting is that the 4 moons were more easily seen with our bright Moon in the field. Maybe my eyes were stopped down by the brightness.

There was quite a bit of CA on Jupiter. I notice it more since being on the Birdforum. It never bothered me earlier. It also varies with the variprism position.
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Old Wednesday 15th March 2017, 18:27   #8
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Quote:
Originally Posted by Binastro View Post
2017 March 14 23.38UT
Used 18x50 IS to easily see all 4 Jupiter moons, immediately identified correctly. They were surprisingly bright.

Our 2 days past full Moon's limb was 1.9 degrees away from Jupiter.


What was interesting is that the 4 moons were more easily seen with our bright Moon in the field. Maybe my eyes were stopped down by the brightness.

There was quite a bit of CA on Jupiter. I notice it more since being on the Birdforum. It never bothered me earlier. It also varies with the variprism position.
Nothing worse than learning to see an optical aberration.
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