Questions about Zhumell 3x Barlow for 12" Dobsonian Telescope

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SUMMARY

The discussion centers on the use of a Zhumell 3x Barlow lens with a 12" Dobsonian telescope. Users express concerns about image quality, magnification effects, and the comparative value of a 3x Barlow versus a 2x Barlow. Key insights include that a 3x Barlow will reduce image brightness, potentially making fewer details visible, and that the choice of eyepieces (EPs) should be considered when selecting a Barlow to optimize viewing experience.

PREREQUISITES
  • Understanding of Dobsonian telescope mechanics
  • Familiarity with Barlow lenses and their magnification effects
  • Knowledge of eyepiece (EP) specifications, including eye relief
  • Basic skills in creating and interpreting optical spreadsheets for magnification calculations
NEXT STEPS
  • Research the differences between 2x and 3x Barlow lenses
  • Learn about the impact of Barlow lenses on image brightness and quality
  • Explore eyepiece selection strategies for optimal telescope performance
  • Investigate how to create a magnification spreadsheet for telescope accessories
USEFUL FOR

Astronomy enthusiasts, telescope owners, and anyone interested in optimizing their viewing experience with Barlow lenses and eyepieces.

NerfMonkey
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Sorry to be starting a new topic yet again, hope I don't look like a post whore:

I'm thinking about buying this barlow but first I have some questions.

1) Will I be sacrificing a lot of image quality (if any) in using a 3x barlow? My scope is a 12" Dob.
2) Will the barlow simply triple the size of the image I see without it, or will it make other things visible that weren't before?
3) Is it really worth it to buy a 3x barlow rather than a 2x?

Thanks.
 
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You need to think about your current EP line-up. I chose my EPs based partly on my choice of Barlows. If you have a 2X and a 1.5x, you've got a real mix-up depending on what EPs you choose. Make up a little spread-sheet of the available magnifications. Remember that some EPs have pretty nice eye-relief, and that this wonderful feature is still available when you've got the EP stacked in a Barlow. It makes a difference.
 
Also, for your #2, a Barlow will reduce the brightness of the image, so less things will be visible, not more.
 

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