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Equipment Discussions >> Eyepieces

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HughM
member


Reged: 07/19/13

Need some new eyepieces. Recommendations? new
      #5979648 - 07/19/13 11:26 AM

I'm brand new to astronomy. I got my first telescope in June and have it all set up and works fine. Apart from the images I get are dreadful. I have a reflector type telescope with a diameter of 76mm and a focal length on 700mm. From previous calculations it had a good focal ratio. I'm aware that telescopes can only be good if the eyepieces are good. I got some rubbish uncoated lens consisting of a H20, H12.5, H6 and a SR4. To be fair the H20 and 12.5 ain't that bad. Get a good field of view but a few optical aberrations and is hard to make out clear details. Any higher magnification and I can't see anything really. The resolution on the image is so poor. Mainly due to reflection I presumed from the image as it was in the eyepiece but very bright. Just wanted peoples recommendations on the best type of eyepieces. Done a bit of research and was looking into getting some plossl. They are a reasonable price and have good a spec. But just wanted some more professional advice before actually going out and getting some new ones.

Thanks


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AngryHandyman
sage


Reged: 06/28/13

Loc: Nanaimo, BC
Re: Need some new eyepieces. Recommendations? new [Re: HughM]
      #5979842 - 07/19/13 01:49 PM

What are your spending limits? There are good options at any level. Under $50 check out Agena 66 degree Enhanced Wide Angle, I have these a find them a good way to start exploring wider views with comfortable eye relief. If you can go higher there are a lot of options that will do well in the $100 and under range such as ES 82 degree eyepieces. You can keep going up in price but those are outside my experience!

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HughM
member


Reged: 07/19/13

Re: Need some new eyepieces. Recommendations? new [Re: AngryHandyman]
      #5979859 - 07/19/13 01:59 PM

Ok. Thanks. My budget is around 50 which is about $75. So between $75-100 really.

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csrlice12
Postmaster
*****

Reged: 05/22/12

Loc: Denver, CO
Re: Need some new eyepieces. Recommendations? new [Re: HughM]
      #5980103 - 07/19/13 04:20 PM

I'd look for used in the CN classifieds. You should be able to pick up some plossels there for that, maybe a used Orion/Clestron kit.

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JustaBoy
Carpal Tunnel


Reged: 06/19/12

Re: Need some new eyepieces. Recommendations? new [Re: HughM]
      #5980110 - 07/19/13 04:25 PM

Hugh,

You said that you were new, so someone has to tell you the truth. You will just be throwing good money after bad - What you really need is a different scope.

Been all through that, starting around 55yrs ago.

Sorry man, but welcome to what we all know.

-Chuck


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GlenM
Vendor - Lyra Optic


Reged: 05/20/07

Loc: Lancashire England
Re: Need some new eyepieces. Recommendations? new [Re: HughM]
      #5980176 - 07/19/13 05:00 PM

Hi Hugh,

When everyone has given their opinions,and there will be lots of them. You may want to buy second hand. Not as bad as it sounds. I think you may well be in the UK so have a look at www.ukastrobuysell.com Lots of second hand equipment usually due to people upgrading.

Clear Skies.


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HughM
member


Reged: 07/19/13

Re: Need some new eyepieces. Recommendations? new [Re: GlenM]
      #5980191 - 07/19/13 05:05 PM

Thanks for all the replies. I'm in the UK yes. Chuck for what reasons should I get another telescope? Just curious as I want to take astronomy seriously I would love more advise on proper equipment. Instead of being embarrassed showing poor images of stars and planets to friends and family haha.

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GlenM
Vendor - Lyra Optic


Reged: 05/20/07

Loc: Lancashire England
Re: Need some new eyepieces. Recommendations? new [Re: HughM]
      #5980203 - 07/19/13 05:12 PM

I could only dream of a telescope for years. I understand what Chuck is saying though,and so will you soon :-) I started with a pair of 8x30 binoculars in 1957. Of course it's not a hobby now,it's an obsession.


Clear Skies.


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Mark9473
Postmaster
*****

Reged: 07/21/05

Loc: 51N 4E
Re: Need some new eyepieces. Recommendations? new [Re: HughM]
      #5980265 - 07/19/13 05:55 PM

What size (diameter) eyepieces does this scope take?
A good 6 or 7 mm eyepiece would be useful, but Plossls in that focal length tend to have uncomfortably short eyerelief.

When you get that 6-7 mm EP, go out a few evenings and check what diffraction pattern you see on a medium bright star. Let the scope cool down a bit, perhaps half an hour or more. The star test will ultimately show you if it's your current eyepieces or your telescope's optical quality (or collimation) that prevent you from having decent views.


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HughM
member


Reged: 07/19/13

Re: Need some new eyepieces. Recommendations? new [Re: Mark9473]
      #5980329 - 07/19/13 06:28 PM

Wasn't aware that it is ideal for it to cool down. Learning more by the day. I'll give it a try tonight. I have 1.25 fitting. Keep the suggestions coming guys. Still have no definitive answer on what I should do. Just getting more confused on whether I should get a new set of eye pieces or a new telescope. To be honest at the moment a new telescope is kind of out of the question. I'm only a student and poor haha. I got the telescope as a gift. Remember I'm just a beginner and I'm not looking for perfection but a good start into something I will be able to get a lot better at with slowly upgrading my equipment.

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Mark9473
Postmaster
*****

Reged: 07/21/05

Loc: 51N 4E
Re: Need some new eyepieces. Recommendations? new [Re: HughM]
      #5980346 - 07/19/13 06:41 PM

Get (or borrow) one good 6-7 mm eyepiece, not a set. Look at the diffraction pattern on both sides of focus. Take images (or make drawings) of what you see and eventually people will be able to diagnose the optics.

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CollinofAlabama
Carpal Tunnel
*****

Reged: 11/24/03

Loc: Lubbock, Texas, USA
Re: Need some new eyepieces. Recommendations? new [Re: HughM]
      #5980646 - 07/19/13 11:09 PM

Hugh,

There are a couple of reasons why Chuck wrote what he did. I'm not the best to explain it. Jon Isaacs, one of the better veterans of CN, has explained it best, but when it comes to telescopes, until at least 4" (102mm), refractors have huge advantages. Clear aperture is one (no central obstruction like newtonians with their 45" diagonal right smack dab in the middle of the objective). As one gets to 5" and beyond, however, reflectors begin to have big advantages. In the first place, the obstruction's effects begin to get overwhelmed by the extra photon collecting power of the correspondingly bigger mirror. OTOH, refractors begin to get exponentially heavier, bulkier, and require increasingly heavier (and therefore harder to move) mounts. And then there are the costs. Below 3", refractors and reflectors are often very close in price. At about 4" and up, however, refractors, just like their weight, clumsiness factor, mount requirements, and costs get increasingly more vexxing. Reflectors, and especially dobsonian reflectors, by contrast, get bigger, too, but rise much more slowly in price, while photon yields take leaps and bounds over their market priced competitive refracor brethren.

But there's another factor, too, and that's your spherical mirror. It produces spherical aberration, which causes the light beams to focus at different points. At low power, this isn't a big issue, but at high power? Problem city

You're right, Hugh, Huygens eyepieces, what you own, are some of the worst, but I'm afraid I'm with Chuck, and would say you might want to turn this in to a pawn shop, take whatever you get, and lay down a bit more cash on something like a 70mm F/10 refractor. These are pretty cheap over here, but of outstanding quality for the moon, planets and such. A 130mm F/5 reflector might be okay, and would have a parabolic mirror, but the collimation design and focusers, at least on the ones here in the US, would deter me and steer me toward a refractor.

I know everything costs more there than here, but I'm afraid in your case I agree with Chuck. Look for a SkyWatcher. These are Chinese, made by Synta, of reasonably good quality, and shouldn't be exorbitantly expensive.

Bon la chance


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SeattleScott
Pooh-Bah


Reged: 10/14/11

Re: Need some new eyepieces. Recommendations? new [Re: CollinofAlabama]
      #5980738 - 07/20/13 12:23 AM

A 6" telescope will gather 4 times as much light as your 3" so increasing aperture is going to be critical for improving your views. A 6" Dob is pretty affordable and collimation is not as critical at F8. Cool down time not a big deal either. A 4" Apo could be nice too but those are pricey. 6" SCT could be good if you want goto. Bottom line is there are scopes that will run circles around your 3" spherical reflector. But they will be much more expensive.

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HughM
member


Reged: 07/19/13

Re: Need some new eyepieces. Recommendations? [Re: SeattleScott]
      #5980911 - 07/20/13 05:22 AM

Ok that makes more sense. Thanks for the description. I think that's what I will have to do. Will just sell the whole lot and purchase a 70mm refractor. Are there any other telescopes anyone could suggest that are reasonably priced yet have good views. Thanks

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HughM
member


Reged: 07/19/13

Re: Need some new eyepieces. Recommendations? new [Re: HughM]
      #5980913 - 07/20/13 05:26 AM

Or a larger 6" reflector. Keep the telescope suggestions coming!

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nicknacknock
professor emeritus
*****

Reged: 02/20/12

Loc: In a galaxy far far away...
Re: Need some new eyepieces. Recommendations? new [Re: HughM]
      #5980922 - 07/20/13 05:49 AM

Hugh,

Check out Teleskop Express as well in Germany. It is actually cheaper to buy from there and ship to the UK as opposed to buying new in the UK.

If you will only do lunar, a 70mm refractor is fine. Consider a 4" refractor though which can keep you busy for quite a while.

Stay away from reflectors for a while as there are additional costs (collimation equipment) and learning curve (collimation). If in the future you want a light bucket, then get a "largish" reflector.

For DSO dark skies are a prerequisite so keep that in mind. Moon and the odd planet are just fine from mostly everywhere.

Finally, consider that you need a scope, a tripod & mount, a diagonal, a couple of eyepieces and a Barlow plus a red dot finder. So, give us your budget and we'll try to provide some recommendations!


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CosmoSat
Pooh-Bah


Reged: 07/24/09

Loc: India
Re: Need some new eyepieces. Recommendations? new [Re: HughM]
      #5980940 - 07/20/13 06:38 AM

Quote:

Or a larger 6" reflector. Keep the telescope suggestions coming!




Skywatcher Skyliner-150P / Classic 6" f/8 parabolic Dobsonian

Clear Skies!


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CeleNoptic
sage


Reged: 12/20/07

Loc: Cloudy East Coast
Re: Need some new eyepieces. Recommendations? new [Re: HughM]
      #5980941 - 07/20/13 06:40 AM

If you take astronomy seriously, I'm sure you'll collect a variety of scopes with the time. But for now you are OK with what you have, IMO. I started several years ago with a pair of 9x40 binoculars like Glen and was learning the constellations over a whole year. Than I switched to a small slow refractor (70mm) and enjoyed for some time while learning the skies and how to use the scope. Finally, I got bigger refractor and the 8" Dob. Aperture is king. This April, when the Saturn was at opposition I showed it to my wife at 300x on my Dob, just jaw dropping view . But I'll never forget the views I saw through that small first refractor and the excitement I felt. I hope you'll do too. And while you are learning the skies and get familiar with the equipment you'll sort out what you prefer, including the eyepieces.

If the budget of $75-100 is per an eyepiece, than no problem, buy Explore Scientifics. If it's a total, than buy a couple of inexpensive plossls, like 20mm and 15mm and 2x barlow. Than you'll have 20, 15, 10 and 7.5mm. And practice, don't miss the nights with good seeing .

If you will want to get a new scope instead, than you'd better buy 6-8" Dobson. Best bung for the buck. The 70mm refractor isn't much better than your reflector unless it's expensive APO, IMO.


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HughM
member


Reged: 07/19/13

Re: Need some new eyepieces. Recommendations? new [Re: CeleNoptic]
      #5980952 - 07/20/13 07:03 AM

I think my new budget for a new scope and lens, mount etc will be around 150. About $230. Will get looking for some new stuff. Keep the suggestions coming. Liking the sound of the 6" Dobson. Will look into them.

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HughM
member


Reged: 07/19/13

Re: Need some new eyepieces. Recommendations? new [Re: CeleNoptic]
      #5980953 - 07/20/13 07:03 AM

I think my new budget for a new scope and lens, mount etc will be around 150. About $230. Will get looking for some new stuff. Keep the suggestions coming. Liking the sound of the 6" Dobson. Will look into them.

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