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Reflector spotting scopes

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Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: February/06/2013 at 10:13
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Optics GrassHopper
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Reflectors do not seem to be popular, but seem to have a lot of performance for the money.  what are the pros and cons of reflector spotting scopes?
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: February/06/2013 at 12:00
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Optics Jedi Knight
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Rear Reflector scopes are normally used for astronomy. They have a micro field of view and poor light transmission. The design does not lend itself well to being used as a spotter. Did you mean a Cassegrain scope. They are used as spotters and as camera lens. The Cassegrain lens system is a more efficient for light transmission. Short but bulky. They are the least stable to mount on a tripod because of bulk.
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Edited by 3_tens - February/06/2013 at 14:54
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: February/06/2013 at 13:19
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Optics GrassHopper
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I did indeed mean reflector, for example the Celstron C90 MAK, or http://swfa.com/Burris-XTS-2575-Spotters-C445.aspx 
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: February/06/2013 at 14:05
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Optics Apprentice
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FOG,

 

I am not familiar with telescopes but friends who are and they say that the reflecting mirror has to be adjusted for best performance and is usually done after every move (I am going on memory from a similar discussion on a different board – Hopefully I understood/remember correctly ) .  It was decided that they would make a better tool for long range spotting at the target range if the atmospheric conditions are good, if mirage is bad they might not be worth the effort.

 

dsr (I apologize for any errors in advance)

 

Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: February/06/2013 at 15:42
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Optics GrassHopper
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dsr- the scopes I referred to are listed as spotting scopes, so I would be surprised if the mirror need constant readjustment.  I did see some comments that some of the Celestrons are not waterproof.  I am not sure if waterproof reflector spotting scopes exist.  It just seems that the performance is better at a lower expense, which makes sense, as the mirror does not need the kind of coatings a lens does, and the lenses in a reflector scope are smaller for a given level of performance, so they would be less expensive as well.  Several big names make reflector spotting scopes, but their lack of popularity is probably a result of some drawbacks.  If the drawbacks are things I can live with, then it would make sense to go with a reflector.  It is not clear to me that reflectors are as robust as refractors though.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: February/12/2013 at 19:35
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Optics GrassHopper
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BTW- I did intend to include Cassegrain type reflectors when I said reflectors.  There are several Celestron spotting scopes with various Cassegrain systems.  Is there a good way to accommodate the bulk of Cassegrain spotting scopes, especially at the range?  Does anyone take Cassegrain spotting scopes out in the field for hunting?

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