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Thread: APO time?

  1. #21
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    Default Re: APO time?



    Quote Originally Posted by Rogan View Post
    Thanks for the comments. I think I'm leaning towards the ES for some definite reasons. First, I am very familiar with the build quality and outstanding CS/warranty. Plus the ES is a triplet and the 80ED doublet seems less like a "true" APO (although I'm sure that isn't quite true). I'm not thrilled by the ES dovetail but that can be changed with rings.
    Check the glass used. Dont know about the Orion but if it's the same stuff used in the Skywatcher 80ED this is a good as you'll get for the price. I'm fairly sure the glass used in the ES scopes at this level are not as good although a triplet while correcting the CA (better for imaging) may not be able to obtain higher power that may be required for visual.
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  2. #22
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    Default Re: APO time?

    Quote Originally Posted by Rogan View Post
    Thanks for the comments. I think I'm leaning towards the ES for some definite reasons. First, I am very familiar with the build quality and outstanding CS/warranty. Plus the ES is a triplet and the 80ED doublet seems less like a "true" APO (although I'm sure that isn't quite true). I'm not thrilled by the ES dovetail but that can be changed with rings.
    Yeah I hear ya. I also bought the same scope during the Black Friday sales. It's my first intro to Refractors too. The mount is a weak point I am thinking of piggybacking it on my SCT or perhaps attaching it to my Nextstar 6SE mount for a poor man goto. Either way some creative hardware will be required.

    Clear skies

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    Default Re: APO time?

    Quote Originally Posted by Davesellars View Post
    Check the glass used. Dont know about the Orion but if it's the same stuff used in the Skywatcher 80ED this is a good as you'll get for the price. I'm fairly sure the glass used in the ES scopes at this level are not as good although a triplet while correcting the CA (better for imaging) may not be able to obtain higher power that may be required for visual.
    The ES uses Japanese "HOYA Dense Fluor Crown, FCD1 ED Glass". The Orion FPL-35ED. Any thoughts?
    "I've... seen things you people wouldn't believe; attack ships on fire off the shoulder of Orion; I've watched C-beams glitter in the dark near the Tannhauser Gate. All those... moments... will be lost... in time, like... tears... in rain."

  4. #24
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    Default Re: APO time?

    Check out this article by Altair Astro - it is for their scopes but lists glass types with the Abbé number and is a good explanation. There is a significant difference between FCD1 and FPL-53 though.

    https://www.altairastro.com/ed-glass...formance..html
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    DeanD (12-02-2016)

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    Default Re: APO time?

    Thanks Dave: an interesting article...

    I thought his comment about 4 grades of optics coming from the manufacturers was interesting- with "grade 4" being the top end.

    I had a discussion with a "mid-range" (in terms of price) manufacturer some time ago, and asked if they would guarantee their optical quality- I said I was wanting a scope that would definitely give me 50x per inch on a good night, and that I was prepared to pay the extra price for that. The manufacturer wouldn't make that guarantee, just repeating that their best scope "will give you very nice views". When I pushed and mentioned a "high-range" manufacturer who was in fact guaranteeing that sort of quality, I was told "We can't match them." That's when I bought my Tak TSA102.

    I guess the mid-range manufacturer used "grade 3" optics...

    - Dean
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  7. #26
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    Default Re: APO time?

    Some decent information there but quite a bit of self promotion.
    Buying a refractor strictly by the type of glass in it is the same as picking your next car by what color it is.
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  8. #27
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    Default Re: APO time?

    Quote Originally Posted by DeanD View Post
    Thanks Dave: an interesting article...

    I thought his comment about 4 grades of optics coming from the manufacturers was interesting- with "grade 4" being the top end.

    I had a discussion with a "mid-range" (in terms of price) manufacturer some time ago, and asked if they would guarantee their optical quality- I said I was wanting a scope that would definitely give me 50x per inch on a good night, and that I was prepared to pay the extra price for that. The manufacturer wouldn't make that guarantee, just repeating that their best scope "will give you very nice views". When I pushed and mentioned a "high-range" manufacturer who was in fact guaranteeing that sort of quality, I was told "We can't match them." That's when I bought my Tak TSA102.

    I guess the mid-range manufacturer used "grade 3" optics...

    - Dean
    Indeed. That guarantee can't be given because of the mass produced nature of the Chinese optics I guess. With luck you may get a particularly good one that is capable of such power per inch but at the same time you can get a duff one.

    Gabby makes a good point about the self promotion in that article.. mainly because they use the cheaper glass and explaining why and in the end there is not really that much difference. I think though that it's important to distinguish Glass type and for what use. Sure a triplet should be better corrected for colour but I'd expect better performance for the higher end (but only doublet) FPL-53 glass when conditions permitted.
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  9. #28
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    Default Re: APO time?

    I have hands on experience with ES 102 and 127 APO, both carbon fiber version, and love them both.

    Another point for going with ES other than good quality and customer service is that it gives you an easy path for upgrading. Once I outgrew 102 I sent it back to ES for store credit. They gave me a fair value, you pay some on top and get next model .

    Life time warranty is good to.
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    Default Re: APO time?

    Glass quality is an order of magnitude more important than glass type when it comes to refractor performance. Similarly, the quality and selection of mating glasses is every bit as important as the type of ED glass used.
    Just going by the type of ED glass is only partially knowing one small aspect of the entire optical system.
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  11. #30
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    Default Re: APO time?

    Thanks for all of the info. Truth be told I'm tending towards "none of the above". I'm beginning to wonder what an APO can do that I can't already do even if it requires using multiple scopes for different targets. Considering I'm a strictly visual observer I would ask "why an APO?".
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