Struggling to Focus with New Telescope? Here Are Some Tips!

  • Context: Stargazing 
  • Thread starter Thread starter Sheneron
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Discussion Overview

The discussion revolves around the challenges and techniques associated with using a new 8-inch Dobsonian telescope, particularly focusing issues with different eyepieces and the impact of environmental conditions on viewing celestial objects. Participants share their experiences and suggestions for optimizing the telescope's performance and enhancing the observing experience.

Discussion Character

  • Exploratory
  • Technical explanation
  • Conceptual clarification
  • Debate/contested
  • Experimental/applied

Main Points Raised

  • One participant notes that the focus point for the 30mm eyepiece is at the maximum retraction, leading to questions about whether this is normal and how to correct it.
  • Another suggests that lack of sufficient focus travel is common and recommends using extension tubes or a diagonal to increase focus distance.
  • Concerns are raised about the clarity of Saturn compared to the Orion Nebula, with some attributing the difference to atmospheric distortion and magnification levels.
  • Participants discuss the importance of allowing the telescope to acclimate to temperature and the effects of light pollution on observing faint objects.
  • Advice is given on collimating the telescope, with one participant sharing their personal experience and preference for using a laser collimator.
  • Suggestions for observing Messier objects and other celestial phenomena are mentioned, with inquiries about specific targets for the current season.
  • Participants share tips on dressing warmly for winter observing sessions and discuss the cleaning of optics, emphasizing that minimal cleaning is generally advisable to avoid damaging coatings.

Areas of Agreement / Disagreement

Participants generally agree on the importance of collimation and acclimation, as well as the challenges posed by environmental factors. However, there are differing opinions on the necessity and frequency of cleaning the optics, as well as the best methods for achieving optimal focus with different eyepieces.

Contextual Notes

Some participants mention limitations in the guides provided with their telescopes, which may affect their ability to collimate properly. Additionally, the discussion reflects varying personal experiences with temperature and light conditions that may influence observing quality.

Who May Find This Useful

Astronomy enthusiasts, particularly those using Dobsonian telescopes, may find this discussion helpful for troubleshooting focusing issues and improving their observing techniques.

  • #61
Perhaps Redbelly 98 has a good point. It may be better to purchase one than build. I'm am/was an engineer so I have this propensity to 'assemble things', and just assume everyone else does the same. Which is a bad assumption on my part.

Although, Baader does enclose directions on how to make a solar filter with their material.

I have used both the Baader 'milar' type filter and glass. I (and this is only a personal preference) preferred the 'cheaper' plastic filter.
I found the glass scratched easily and did not give the same 'white light ' clarity.

Of course you still have to be careful with the Baader film and not stretch or puncture it.

Again I concur with Redbelly98. If you purchase a solar filter be careful with it.
Don't take any chances with your vision.
Barbecuing ones retina is definitely not cool.

However, in fact I had my 10" scope out today with the solar filter on. I bought a new Canon camera yesterday and was trying it out. No sunspots though.


In Barlow lens I have three, a 2X, 3X and 5X. Out of those I use the 2X most frequent when I use a Barlow. I suppose actually the 5X is then next in line. I like to use it at times with the 32mm PLöSSL eyepiece.
Although, I don't think I would recommend a 5X for people just getting into astronomy.

Good EPs are expensive, so it's a good idea to choose a high-quality Barlow, and choose the multiplicative factor carefully so that you can get a wide range of powers with a modest number of EPs.

Could not have said it better myself. :-)
 

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