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CyberJeepEric
member
Reged: 05/11/09
Posts: 12
Loc: Pompano Beach, FL
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Yes, I am new to this. I was researching eyepieces when I settled on a Meade 6.7mm UWA 5000 Series. It should be arriving tomorrow. However, when I checked my order, I saw that it was for a 4.7mm. Will this work? I have read that the ETX-125 can go to 500x but most suggest 250x max. What should I do, send it back before opening it?
Anyone used this combination that can advise???
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Arthur Dent
Galactic Hitch-Hiker
Reged: 10/23/08
Posts: 1181
Loc: South Yorkshire, UK
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Hi Eric
Welcome to Cloudy Nights and the ETX forum in particular.
Most viewing will be best at 250x or lower - due mainly to atmospheric conditions - "seeing" rather than anything else. On the ETX-125, this would equate to a 7.6mm eyepiece.
There are rare occasions - only maybe a couple per year, when the atmophere and weather allow really high magnifications to be used.
It all depends on whether you can afford to have an eyepiece basically sitting around (unused) for months on end - simply because the conditions render it useless.
Personally, my smallest eyepiece is a 9mm, and I've yet to see exactly what it can deliver.
When the atmosphere (& weather) isn't being too co-operative, all that smaller eyepieces do is just magnify the atmospheric effects.
Only you can decide about returning the eyepiece unopened, or whether you are prepared to have it just sitting around waiting for those "perfect seeing" conditions.
Hope this helps
Art
EDIT:
Check out Mike Weasner's Site for all things ETX.
This thread discusses magnification on the ETX-125
Art
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If I like it, the wife says that we can't afford it!
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Meade ETX105 (a nice "Grab & Go" scope) & Celestron NexStar 6SE with Bob's Knobs.
Various EP's from 6mm to 26mm, Baader Hyperion 8-24mm Zoom, a 2x Barlow, 2" diagonal and 7Ah PowerTank.
MRF and Antares 8x50 RACI finder scope - both for the 6SE's OTA, whilst the ETX gets a plain RDF.
Canon EOS 400D DSLR (un-modded) and SPC900 webcam. Finally climbing the AP Learning Curve!
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CyberJeepEric
member
Reged: 05/11/09
Posts: 12
Loc: Pompano Beach, FL
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Thank you for the input. I am calling telescopes.com to see exactly what their return policy is. They said I could try it and return it if it doesn't work out for me. I will most likely be exchanging it for an 8.8mm.
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brianb11213
Carpal Tunnel
Reged: 02/25/09
Posts: 2098
Loc: 55.215N 6.554W
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Quote:
I was researching eyepieces when I settled on a Meade 6.7mm UWA 5000 Series. It should be arriving tomorrow. However, when I checked my order, I saw that it was for a 4.7mm. Will this work? I have read that the ETX-125 can go to 500x but most suggest 250x max. What should I do, send it back before opening it?
Anyone used this combination that can advise???
IMHO even 6.7mm is ridiculous, x250 is a real struggle with a 125mm scope, x160 is a more realistic estimate of what is a "useful" high magnification (given perfect optics & seeing).
The 4.7mm will "work" in the sense that it will fit in the eyepiece holder tube & produce an image, however it will be mushy well past the point that I would consider unbearable, this is due to diffraction i.e. an aperture related effect not due to optical design or construction of either scope or eyepiece.
A 4.7mm EP may be useful as a high power with a f/5 or possibly f/6 scope.
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CyberJeepEric
member
Reged: 05/11/09
Posts: 12
Loc: Pompano Beach, FL
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I swapped it for a 16mm Super Wide Angle 5000 series and it looks great. Thank you for your input. Now if I could only get it to power up...
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TimD
scholastic sledgehammer
Reged: 02/16/05
Posts: 900
Loc: CA USA
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good choice for the ETX
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Takahashi TSC 225
WO Megrez 102
Meade ETX 90, ETX 125
Meade LX90
Classic Orange tube C14, C90, C5+
Etc,Etc,Etc!!
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