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I can't see anything through my 3mm eyepiece

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14 replies to this topic

#1 caballerodiez91

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Posted 05 August 2022 - 11:10 PM

Hello,

 

I think it's a distance problem right? what t2 adapter do you think I need?

 

Btw I use a 5x barlow. Both eyepiece and barlow are Explore Scientific.

 

Thank you.

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Edited by caballerodiez91, 05 August 2022 - 11:10 PM.


#2 ButterFly

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Posted 05 August 2022 - 11:24 PM

Try taking off the 5x barlow.  It's insanely high power with a 5x barlow.


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#3 vtornado

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Posted 05 August 2022 - 11:29 PM

Is there something on top of the focuser?  Then the barlow, then the eyepiece.

 

It appears you are running out of in focus.

 

Can the first piece be removed, and the barlow fitted directly into the visual back ???


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#4 Skittersqueek

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Posted 05 August 2022 - 11:31 PM

Oof yea take that barlow off and make sure you are on an easier target to see with such high magnification.
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#5 gene 4181

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Posted 06 August 2022 - 12:04 AM

 You're using both  eyepiece adapters  in that SW  newtonian with a 1.25 inch eyepiece ....   is that a commonly used  configuration to reach focus ?  In my 150 @5  w/ 2 inch  focuser  , I usually only use  1 . 



#6 Astrojensen

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Posted 06 August 2022 - 01:29 AM

Well, if that's a 6" f/5 newtonian, and you're using both a 5x barlow and a 3mm eyepiece, you're trying to observe at 1,250x... That might explain why you can't see anything! 

 

 

Clear Skies!

Thomas, Denmark


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#7 Illinois

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Posted 06 August 2022 - 06:24 AM

Key is best is up to 50 power per inch would be best view. Your 6 inch is up to 300 power! Around 180 to 200 power would be good for most night then if view look good then try go little higher power!  Very high power wouldn’t give you any details or sharp view! 


Edited by Illinois, 06 August 2022 - 06:25 AM.

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#8 Barlowbill

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Posted 06 August 2022 - 10:43 AM

Power corrupts 


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#9 MarkMittlesteadt

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Posted 06 August 2022 - 03:52 PM

Power corrupts 

I think the full quote is...

 

"Absolute power corrupts, absolutely."

 

I think using a 3mm EP with a 5X Barlow, we can assume the power is absolute. shocked.gif


Edited by MarkMittlesteadt, 06 August 2022 - 03:53 PM.

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#10 ButterFly

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Posted 06 August 2022 - 05:31 PM

Power corrupts 

Absolutely.



#11 rhetfield

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Posted 06 August 2022 - 06:19 PM

Well, if that's a 6" f/5 newtonian, and you're using both a 5x barlow and a 3mm eyepiece, you're trying to observe at 1,250x... That might explain why you can't see anything!


Clear Skies!
Thomas, Denmark

the 3mm by itself is pushing the limits of that scope.
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#12 Chad7531

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Posted 06 August 2022 - 06:59 PM

the 3mm by itself is pushing the limits of that scope.


In my 6” F5 I use a 3.5mm every time I observe the moon when the seeing allows it. I’ve used it in a 2.5x PM with excellent results too, but that’s a rare seasonal occasion that the seeing is that good. His 3mm provides 250x and .6mm exit pupil, on the moon that’s pretty ideal. It could be used with a 1.5x or even 2x Barlow in excellent seeing, not that 5x Barlow though.

Edited by Chad7531, 06 August 2022 - 08:20 PM.


#13 rhaskins

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Posted 06 August 2022 - 09:17 PM

50x PPI is the *rule-of-thumb* for usable power. Go to the Tele Vue website to see how they analyze that.

https://televue.com/...page.asp?id=154 Lots of articles
https://televue.com/...rn=Advice&id=79 Choosing eyepieces basic
https://televue.com/...n=Advice&id=230 Choosing eyepieces advanced

I believe these Tele Vue guys know a thing or two about eyepieces, and 3mm with a 5x barlow on a scope like yours only gives you views of electrons rotating around protons. Or something similar.

Rick

#14 KTAZ

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Posted 06 August 2022 - 09:21 PM

This has to be a troll post...


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#15 rob1986

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Posted 09 August 2022 - 11:48 AM

the 3mm by itself is pushing the limits of that scope.


3mm should be just less than maximum mag with that scope.
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