Author Topic: Need advice on getting first eyepieces.  (Read 352 times)

Christopher Bryant

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Re: Need advice on getting first eyepieces.
« Reply #15 on: January 15, 2018, 09:17:56 PM »
For high power viewing, I generally like to start at a 1mm exit pupil. For your scope that would be a 5mm eyepiece.
You can either get a standard 5 mm, or get a barlow to turn your 9 into a 4.5. Note that plossl's have short eye relief under 10mm.
I also like TMB for high power, much better eye relief and good performance for the price.

I have seen the 130 SLT on display, and I don't know if the mount can handle heavy 2" eyepieces without developing a "twang".
There are some lighter weight 2" kellner eyepieces that you could buy cheap and try.  Cellestron e-lux, GSO superview. Even these weigh 10 oz.

A 32mm plossl would give you a little wider field than the 25, is cheap and will not unbalance your scope.

Stanley Edwards

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Re: Need advice on getting first eyepieces.
« Reply #16 on: January 16, 2018, 12:35:50 AM »
Here are some additional things to consider.

I think Mike W makes a good point about heavy eyepieces putting a strain on that GoTo system. And, frankly, I don't think you need one, at least not right now

This is a 650 mm FL scope.  I don't know if the standard eyepieces are Plossls or Kelners so I can't be sure of the AFOV.When I look at my scopes I want to cover 3 bases.

A low power wide field eyepiece, a high power that takes the scope near its max and I like the zoom for the mid range.

On my ETX 80 that is a 25 mm plossl that gives me 15X and 3.4 degrees.  A 6.4mm Plossl with a 3X barlow got me to 180X.  Mostly for the moon, Jupiter and Saturn at that mag on this 80 mm scope.

On this scope, with a 650 mm FL, I would think a 32 mm Plossl would do a good job for the low power wide field.  20X and 2.6 degree FOV. That is wider than my widest 2" eyepiece on my XT8i.  For now I don't think there is a need to go lower or wider.32mm Plossl - GSO, Celestron or Meade should all be good. - $40
http://agenaastro.co...i-eyepiece.html

I suggested the Zoom to cover the broad range $60

ON my short focal length scope, like this, I recommend a 3X barlow.  $50?
3X barlow here would take that zoom out to 243X, near the scope's practical maximum.
A 2X barlow is not going to get you there. $150 and you have all bases covered.

You may never feel the need for anything else.  However, over time you see what interests you most.

You don't need wide field for planets or the moon. Nice to have but not really necessary

Is the local seeing good enough to allow you to work above 240X on a regular basis? Only time will tell so use it for a while and see what you learn about the scope and the local seeing conditiosn.  Even with my 8" scope I do most of my observing below 250X due to atmospheric conditions.

If you decide to add single FL eyepieces then I would recommend Explore Scientific 68 or 82 degree line.  $125 to $150 per eyepiece and occasionally they have sales.
http://agenaastro.co...scientific.htmlBecause this is a wide view scope you don't necessarily need very wide view eyepieces and I would likely not go 2" for anything.

pregdefciato

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Re: Need advice on getting first eyepieces.
« Reply #17 on: January 21, 2018, 12:56:19 AM »
Thank you everyone, very informative. I think I have a good idea what to start with now.

erenlinra

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Re: Need advice on getting first eyepieces.
« Reply #18 on: January 21, 2018, 01:14:24 AM »
Here's a different and, IMO, better approach. I have a 130mm f5 Dob and it is a lot of fun and a very productive observing tool. It is primarily a widefield instrument but will do credible planetary and lunar observing too. From a dark site, DSO presentations are quite good. Don't try to make it into a complex instrument.

Get 2 really good eyepieces. That's all you need. Spending half your ep budget on a Barlow is a failure mode, for sure. Get a widefield and a high power ep and go observe. There are 10's of thousands of glorious objects to see with that kit. Maybe add a UHC filter for nebulae.

I recommend an Explore Scientific 68 degree 24mm widefield and an Explore Scientific 82 degree 6.7mm for higher magnification. Then your 1st eyepieces can be your last eyepieces until you buy another telescope.

Then join Texas Astronomical Society of Dallas, drive up to our SE Oklahoma dark site 100 miles north of here and let your gear blow your socks off from out in the dark.

Antonio Stanton

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Re: Need advice on getting first eyepieces.
« Reply #19 on: January 21, 2018, 06:52:46 AM »
I am amazed that the celestron nextstar 130 comes with a 2inch focuser , in RSA we get a 1.25 which is quite bad ,mostly plastic but anyway the mount is on its limit with a 130 reflector so 2 inch eye pieces are far too heavy and not suited for this design , being a F5 its suited for wide field views , I used Celestron Xcell lx quite cheap and work ok for lower end scope

Patrick Zhu

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Re: Need advice on getting first eyepieces.
« Reply #20 on: January 23, 2018, 05:47:57 AM »
Thanks Sky Muse, I did get a laser collimator, same as the one the guy is showing in the video you linked. Had no idea the collimator itself needed to be aligned also, will check that out.

Kunjan Blanco

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Re: Need advice on getting first eyepieces.
« Reply #21 on: January 23, 2018, 06:33:33 AM »
A point of clarification: the maximum field stop for a 1.25" eyepiece is approximately 27mm so a 1.25" 32mm eyepiece can't have an apparent field of view of more than about 50 degrees. A 1.25" eyepiece with a 68 degree AFOV is limited to about 24mm in focal length.

http://www.televue.c..._page.asp?id=79

Dave Mitsky

Eric Hayes

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Re: Need advice on getting first eyepieces.
« Reply #22 on: January 25, 2018, 08:22:59 PM »
For Jupiter, how about a 6mm Ortho? It would give you 108x magnification and a 1.2mm exit pupil. It would be a step up from the 9mm at 72x. 108x isn't too high for mediocre seeing conditions with Jupiter either. A 6mm Ortho has 2 drawbacks. First, it only has a 42 degree AFOV. Second, eye relief is a bit short. The older volcano top Ortho design makes short eye relief more tolerable than the flat top orthos. I see used Circle-T volcano top Orthos advertised for under $50 in the CN classifieds from time to time. If you try one of these and don't like it, they are easy to re-sell in the CN classifieds too.

A 6mm Orion Expanse would give you more eye relief and a 66 degree field of view. But at f/5, it probably won't be sharp all the way to the edge of the view. There are also Expanse clones available cheaper than the Orion brand. I picked up a used one of these about a month ago, but the weather hasn't been good enough to compare it against an Ortho. I see these used in the CN classifieds for under $40 sometimes.

For about $80, a 4.5mm Meade HD-60 would give you 144x magnification, a 0.90mm exit pupil, good eye relief and a 60 degree AFOV. I had good results using one of these in my f/4 reflector. These are bigger and heavier than an Ortho or Expanse though. A 2x barlow with a 9mm plossl eyepiece would have the same magnification, but with a narrower 52 degree field of view and shorter eye relief. Also, a barlow is one more thing to fumble with in the dark.

These are just a couple of suggestions. There are hundreds of eyepieces out there. What works for me may not work for you. So you may have to try a couple of different eyepieces before you find the 'perfect' one for you.

soecolerfe

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Re: Need advice on getting first eyepieces.
« Reply #23 on: January 25, 2018, 10:12:25 PM »
Thanks for the additional replies/insight. Penguinx64 I did in fact settle on a Meade HD60 4.5mm along with a 30mm Vixen plossl and instead of a barlow I got a Baader moon/sky glow filter. I felt like the filter would have more utility for now. I'll experiment in a few days when I get everything in and this crappy weather clears up!

Lamichael Evans

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Re: Need advice on getting first eyepieces.
« Reply #24 on: January 31, 2018, 01:40:21 AM »
Quote
Thanks for the additional replies/insight. Penguinx64 I did in fact settle on a Meade HD60 4.5mm along with a 30mm Vixen plossl and instead of a barlow I got a Baader moon/sky glow filter. I felt like the filter would have more utility for now. I'll experiment in a few days when I get everything in and this crappy weather clears up!
And when the time comes that you want more focal lengths for more options, you can just buy more eyepieces in the HD60 range. They're a surprisingly good eyepiece for the price.
Sent from my LG-H915 using Tapatalk

veworltonuc

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Re: Need advice on getting first eyepieces.
« Reply #25 on: January 31, 2018, 12:23:44 PM »
Quote
Thanks for the additional replies/insight. Penguinx64 I did in fact settle on a Meade HD60 4.5mm along with a 30mm Vixen plossl and instead of a barlow I got a Baader moon/sky glow filter. I felt like the filter would have more utility for now. I'll experiment in a few days when I get everything in and this crappy weather clears up!

Good eyepiece choices. Well done!

Let us know how you like the Baader filter.  I am sure it will be great on the moon.  Will be interested to hear if you feel it helps with light pollution.  My sky is pretty bright even during the new moon.

Andre Ransom

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Re: Need advice on getting first eyepieces.
« Reply #26 on: February 02, 2018, 03:55:38 PM »
I also have a Celestron Nexstar 130 SLT newtonian and had the exact same questions you did when I wanted to upgrade. There are a few things you should know\consider.

- You will realize that the 9mm and 25mm eyepieces you got with the scope are seriously disappointing once you start using better ones.
- Since you are just starting off, seriously look at quality used eyepieces to get you going. The $ savings could mean the difference between getting one or two alright eyepieces and getting a couple decent ones. I see them here on the CN classifieds, Craigslist and eBay all the time. I have gotten all mine this way and have not had any issues.
- The mount\tripod for that scope is pretty shaky right out of the box. As a result adding weight to it in the form of heavy eye pieces and a barlow will a make it worse. Consider the weight of each eyepiece and trying to do without a barlow carefully.
- I have a Meade Series 5000 HD-60 4.5 and have found any more magnification (via a barlow or EP) is useless because the mount is just to shakey beyond that.
- A 32mm is about the end of the line with what you can use before you start seeing the secondary mirror and spider. I have a Celestron Omni 32mm that shows really great views (and is super light weight). I have an Orion Q70 38mm (big and heavy) that I can not use on it without a barlow which is just too much weight for the mount.

All that said, I really like the scope. I bought a whole set of new Celestron Omni's for my first upgrade and was so disappointed. After returning them I slowly picked up a bunch of used slightly higher end pieces and have been really happy. I have two Meade Series 5000 HD-60 (4.5mm and 6.5mm), three Celestron X-Cel LX (9mm, 12mm and 18mm) and a Celestron Omni 32mm eye piece which all work great on this scope without a barlow and show great views. I like the wider field 60+ degree eyepieces as they really give a great perspective.

The sky is the limit on what you can spend on this astronomy stuff. Keep it in perspective.

perpemucho

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Re: Need advice on getting first eyepieces.
« Reply #27 on: February 03, 2018, 07:23:49 AM »
Quote
Hello! I've had a Nexstar 130 SLT for a couple of months. I feel pretty comfortable with the basics of using my scope. After catching Jupiter recently, that really made me want to upgrade! I'm still pretty new and just plan on doing casual observing. Although I've done quite a bit of reading, I still feel somewhat overwhelmed with all the options. I live in Texas, just outside of Dallas. But I have a good spot away from light pollution. Currently I just have the eyepieces that came with the scope, 9mm and 25mm. My first purchase would likely be a 2x barlow and an eyepiece. What would be a good focal length to start with? Budget-wise I'm ready to spend around $100 on the barlow and $100 on the eyepiece. I'm looking at a Televue 2x barlow for $120.

Where do you want your scope to take you?

A 130mm f5 Newt is a pretty nice setup for BY observing and easy enough to transport to dark skies. If you want to see a wider field, get a 32 Plossl for reasonable $$. More mag range between your 25 and 9? Get a decent 2x barlow. EPs below 9mm have limited eye relief and give us magnification that often exceeds local seeing conditions.  I would probably get a decent 32mm Plossl and Barlow to fill out the range of choices and spend some time under dark skies. After you have completed the Messier catalog and visually observed 5 planets in detail, you will have a good idea where you want your scope to take you. I'd save the much more expensive 2" Nagler for your next scope.

Randy Wiggins

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Re: Need advice on getting first eyepieces.
« Reply #28 on: February 09, 2018, 09:31:49 AM »
Furniture, hmm?

Anyway, you'll love it when you get darker sky's.

The moon gets pretty bland when it's full or almost full, not many shadows to accent the terrain.
Once it's into 3/4 phase or less it's awesome.

My zoom came in today, postman had to come by canoe cause of the flooding,,,,, oh well.

Edit:
unique username, anyway the filter is what I was referring to, the contrasting and bandwave filters do more for any of the three planets than colored ones do.
mateodiego has great advice on the eyepieces.
I upgraded my zoom eyepiece just for lunar viewing.
I think a zoom might be a bit heavy for your mount,

2nd Edit:
I just checked the tripod online, there's not much that can be done to stiffen it up, might try shortening the legs as much as possible and sit to view.