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Eyepieces for an Orion XT4.5

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#1 Udderly Abducted

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Posted 05 June 2020 - 01:03 PM

Hi everyone,

I recently purchased an Orion XT4.5 dob, and I could use some help in figuring out a good range of eyepieces to use with this scope. Specs are 4.5", F/8, and 900 focal length. I'm more familiar with 8" dobs and short tube 80mm refractors, so I'm not exactly sure what this scope is capable of.

I prefer to keep it as cheap and simple as possible. I'd rather have fixed eyepieces than a zoom. So what would be a good spread of single eyepieces? I'm guessing a 32mm, 16mm, 8mm, and 6mm. Does that sound right? I'm not sure if a 5mm or 4mm will be that usable, so maybe someone can weigh in on that?

Thanks!

#2 havasman

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Posted 05 June 2020 - 02:45 PM

The club received an XT6 donation I was charged with getting up to speed before it went up to the dark site. I matched it to a 25/12/8mm set of Astro-Tech Paradigm Dual ED's that worked really well.


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#3 dmgriff

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Posted 05 June 2020 - 03:18 PM

25mm, 15mm, 10mm plossls and 2x Barlow would be a really nice spread of magnification, while maintaining some eye relief.

 

The Telescope Warehouse has a set of 25mm, 12.5mm, 6.5mm plossls, that totals ~48usd for the three. Refer page 2 below link. They also have a variety of inexpensive eps.

 

https://telescope-wa...yepieces?page=1

 

The Surplus Shed has a multitude of eps and related equipment.

 

https://www.surpluss...Eyepieces--Sets

 

Good viewing,

 

Dave


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#4 Udderly Abducted

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Posted 05 June 2020 - 04:12 PM

Thanks for the suggestions! I know I said I didn't want a zoom, but I'm actually leaning towards that now. I think it would just save time, and I want this scope to be really easy for quick sessions. I might order a Meade since it's the same thing as the Celestron for a cheaper price.

#5 eros312

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Posted 05 June 2020 - 04:26 PM

It comes with 25mm and 10mm Plossls, right? In that case I would just get 32mm and 15mm Plossls along with a 2x Barlow. 



#6 Bistromath

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Posted 05 June 2020 - 08:18 PM

This article talks about eyepiece selection according to the exit pupil they provide.  It recommends using eyepieces that provide 0.5, 1.0, 2.0, 4.0, and 7.0 mm of exit pupil.  This at least provides a good starting point for choosing eyepieces.



#7 Alan K

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Posted 05 June 2020 - 09:12 PM

I’d probably go with 25 and 15 plossls with a 3x barlow for more eye relief.

#8 Udderly Abducted

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Posted 05 June 2020 - 10:10 PM

Those all sound like good ideas! Really similar to what I had been thinking over the last day or so. I just decided to order a Meade zoom and be done with it. It just seemed like a good deal considering the price, and I will pair it with a 32mm plossl and 2x barlow. Then I can always get individual eyepieces if I want when I figure out my most used focal lengths. Thanks for all the help!

Edited by Udderly Abducted, 05 June 2020 - 10:11 PM.

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