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derangedhermit
Pooh-Bah


Reged: 10/07/09

Loc: USA
Is a two-stage focuser needed for an f/5 scope? new
      #5536783 - 11/24/12 08:22 AM

Assume old eyeballs, if that makes a difference.

I have a JMI that I can upgrade to a two-stage focuser (at considerable cost). I'm wondering if it is worthwhile.

Visual use only, on a Dobsonian.


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kfrederick
Carpal Tunnel
*****

Reged: 02/01/08

Re: Is a two-stage focuser needed for an f/5 scope? new [Re: derangedhermit]
      #5536801 - 11/24/12 08:39 AM

A bigger knob helps .

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Ed D
Carpal Tunnel
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Reged: 04/30/10

Loc: Sunny South Florida
Re: Is a two-stage focuser needed for an f/5 scope? new [Re: kfrederick]
      #5536844 - 11/24/12 09:05 AM

Not if observing at lower magnifications. However, if you want to get really fine focus at high magnification, such as when observing planets, then it really is nice to have, especially for older eyes. I also use big focus knobs on my f/8 Dob and it does help. Small knobs are a PITA no matter what the scope speed or type of focuser.

Ed D


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operascope
sage
*****

Reged: 09/03/08

Loc: Canada
Re: Is a two-stage focuser needed for an f/5 scope? [Re: Ed D]
      #5537162 - 11/24/12 12:16 PM

A cheaper option might be to use a helical fine focuser. However, I like 2 stage for all my scopes. Even makes my f/9.4 better.

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