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Thread: Eyepiece or filter..

  1. #11
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    Default Re: Eyepiece or filter..



    Quote Originally Posted by shackybracky View Post
    Thanks for all the replies! It really has helped. I'm definitely going for an eyepiece, just not 100% sure which one. I've emailed the shop to see when they might have the 11mm in stock but they're closed until new year. I feel i'll eventually use both and chose the 11mm first because it was closer (very slightly) to the 10mm stock eyepiece I've been using than the 8.8mm. Even if I order the 8.8mm today it won't get posted until the shop opens again and I'll find out about the 11mm then so I'll wait and see what they say.

    Thanks again.
    Its our pleasure to help out in anyway we can.
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  2. #12
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    Default Re: Eyepiece or filter..

    Quote Originally Posted by shackybracky View Post
    The only problem now is...the shop I have vouchers for (and most other shops) is out of stock of the ES 82 11mm. I mostly use my stock 10mm so I'm thinking maybe I should order the 8.8mm now and see how I go. Hmmm. Does anyone own and use both the 11mm and 8.8mm or is I a case of one or the other?
    So.... you order it through them, and hold on.
    That way you wait will be meaningful.
    When it comes in, it's yours.
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    Default

    Just my two cents...
    If your 10 and 25 are adequate ep's and the Barlow gives you a 5 and 12.5 have you considered one that falls outside what you already have? Maybe a 34 that Barlow's @ 17 or a 16 that Barlow's @ 8.
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  4. #14
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    Default Re: Eyepiece or filter..

    The 10mm and 25mm that I have are the stock ones that came with the scope and I guess I'm assuming they're pretty average compared to the ES82 range?

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    Default Re: Eyepiece or filter..

    I would assume that these are Plossl eyepieces which have a 50° apparent field of view (AFOV), though you will see many vendors saying 52°. Regardless, when compared to the ES 82° series or the ES 68° series, there are definitely some differences. One is that the Plossl has a simpler interior design, which isn't necessarily bad. The ES eyepieces utilize a more complex design inside the housing to combat some the aberrations that can appear as you attempt to increase the AFOV. Plossls are a tried and true design, simple but effective. The biggest problems they have is the smaller AFOV (for some that isn't a problem at all) and when you start getting to the shorter focal lengths, eye relief. If one wears glasses to observe, then eye relief becomes very important. But even to someone who does not wear glasses to observe, the eye relief can get short enough to become uncomfortable because you have to place your eye close to the eye lens of the eyepiece in order to see the whole field of view it offers. Comfort is certainly a consideration.

    Many get by with and love their Plossls. It really does come down to if one wants to get a wider field of view. Since you have a driven scope, that may not be as important to you, because you don't have to nudge your scope manually to follow an object. Whereas manual dob owners have to do that, and having a larger AFOV will keep the object within the field of view longer as it drifts across your view.

    That said, if you want to get that more roomy view, then I can recommend with ES series. It sort of depends on how much eye movement one is comfortable with in order to take in the complete view. I know with the 82° AFOV, I do have to move my eye around a little to see the whole picture. But I don't find it uncomfortable. Having owned 68° eyepieces, I really didn't notice having to move my eye around hardly any. Some prefer keeping that eye movement to a minimum, so around 68° to 70° AFOV is plenty for them. While others want as much as they can get, and may go for 100° or even 120° AFOV eyepieces, which start getting rather expensive. For myself, I am happy at 82° and have no plans to go wider.

    I don't believe you would be disappointed with either ES line, but then again, only you can judge how satisfied you are with your current Plossls, and if merely buying more at different focal lengths, and/or a good barlow would satisfy your needs.
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    Default Re: Eyepiece or filter..

    Thanks for the reply Alan.

    After doing some more reading on the eyepieces I have I'm surprised that I've preferred to use the stock eyepieces over the plossls I have. The stock eyepieces are colourless and plastic whereas the plossls glass is green/purple and metal. I think I'll have another look at the plossls next time I'm out.

    I also had a read into the es68's vs es82's and they both sound like good selections. The only thing stopping me ordering an es68 is the range starting at 16mm because I'm looking to replace the 10mm stock eyepiece I've been using the most. Whether I end up with the 8.8 or 11 it sounds like it will definitely be an upgrade on what I have.

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    Default Re: Eyepiece or filter..

    I take it that your reference to green/purple is to the eye lens of the Plossls, which would be the coatings on the glass that increase light transmission and reduce light scatter. I can't vouch for the stock ones, but if you don't see any colorization to the eye lens, I have to wonder if they have coatings on the air-to-glass surfaces. You mentioned plastic, were you referring to the lenses in the eyepieces or the barrels, or both? If the lenses are plastic they may well not be coated. The light transmission for non-coated eyepieces are significantly less than for coated ones. That said, I would be surprised if they would provided non-coated eyepieces though, but of course anything is possible. Is there any info on the stock eyepieces to help identify them more clearly?
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    ES 82° 24mm, 18mm; Pentax XW 10mm, 7mm, 5mm
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  8. #18
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    Default Re: Eyepiece or filter..

    image.jpeg

    The back three are what came with the scope. They have glass lenses and plastic barrels. The middle three plossls I bought for a previous scope. They have glass lenses and metal barrels. The front one is just a solid plastic 0.965 eyepiece that came with my first scope, which I never use now.

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    Default Re: Eyepiece or filter..

    Quote Originally Posted by shackybracky View Post
    image.jpeg

    The back three are what came with the scope. They have glass lenses and plastic barrels. The middle three plossls I bought for a previous scope. They have glass lenses and metal barrels. The front one is just a solid plastic 0.965 eyepiece that came with my first scope, which I never use now.
    I think I finally tracked down your stock EPs. They look to be a 3-element Modified Achromat (or MA) like this: Skywatcher Super MA 25mm Eyepiece - Best Price at Bristol Cameras

    They are so-so eyepieces. Usable, but I'd rather have the 4-element Plossl. Based on the link above, they state they also have a 50° AFOV like the Plossl, though I am surprised the eye lens on the MA isn't closer in size to that of the 25mm Plossl. I know typically an MA has an AFOV closer to 40°. I can see that the MA's do have coatings on the eye lens in your image. For the 0.965, I can see it is a Kellner (denoted by "K" on it). You can buy adapters to use them in 1.25 focuser, but I don't see that worth the effort honestly. Hope that helps.
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    Default Re: Eyepiece or filter..

    Hi all. I though I would update this thread on what I eventually ordered, as it arrived this morning. I spoke with the shop about the 11mm es82 and they couldn't tell me when it was going to be back in stock so I went ahead and ordered the 8.8mm es82.

    Having recently received the es70 25mm and not seeing a huge difference between that and my stock eyepiece, other than the pleasure of looking through a 2" eyepiece, I wasn't sure what to expect with this 8.8mm. So I set up tonight and went through my stock eyepieces and plossls and had a good look at what the view was like through the 10mm stock, 10mm plus Barlow, 15mm plossl and 15mm plus Barlow. Then I tried the new 8.8mm es82. Holy moly!!! When I look through all the other eyepieces it feels like I'm looking through a tube pointed at the sky. But when I look through the 8.8mm it's like I'm in the sky! It really is amazing and it feels completely different to view it that way. I spent over an hour on one target comparing the old eyepieces to the new one and the new one barlowed and I absolutely love the 8.8mm. I'm looking forward to spending a lot of time looking through this eyepiece and ordering more from the range when I can.

    Thanks fo everyone's help. Going for the eyepiece was definitely worth it!

 

 
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