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Thread: Question re 9mm vs 20 mm and a 2X Barlow

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    Default Question re 9mm vs 20 mm and a 2X Barlow



    The ES sale has me thinking of buying a 2 inch 100 degree 9mm. I already have the 2 inch 20mm 100 degree (Love it) and a 2X Barlow. Would it be worthwhile to get the 9mm or would the view basically be the same as the 20 with a Barlow?
    Celestron C9.25 XLT w/ Feathertouch Microfocuser on an AVX mount
    Baader Click Lock Star 2 inch Diagonal with Baader 2" SCT Click Lock EP Adapter with Antares Twist lock 2" to 1.25" adapter
    2 inch ES 100* 5.5mm and 20mm + Baader Hyperion Mark III Zoom
    Baader and Agena Barlows
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    Default Re: Question re 9mm vs 20 mm and a 2X Barlow

    I too am having a similar dilemma. I was going to purchase the 6.7 ( and still may). I have a 2x Barlow and opted for the 11mm instead which would then give me 5.5. To me that is too close to the 6.7 and I also get a little more mag doing it this way.
    The light loss because of the barlows is minimal so this is the way I went. Another reason I went this way is because I used to have a Delos 6.6 and it was not good for me. Most likely because of my seeing conditions in my area. So was afraid that ES 6.7 would also not be good. But I sure am curious as to the comparison between the two.
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    Default Re: Question re 9mm vs 20 mm and a 2X Barlow

    Seeing conditions are never good enough for me to use my 5.5
    Celestron C9.25 XLT w/ Feathertouch Microfocuser on an AVX mount
    Baader Click Lock Star 2 inch Diagonal with Baader 2" SCT Click Lock EP Adapter with Antares Twist lock 2" to 1.25" adapter
    2 inch ES 100* 5.5mm and 20mm + Baader Hyperion Mark III Zoom
    Baader and Agena Barlows
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    Default Re: Question re 9mm vs 20 mm and a 2X Barlow

    If I had the 20mm and like the view when barlowed, I would look for something other than the 9mm. I have the 82s except for the 8.8mm and 4.7mm and this sale has me thinking about the 8.8mm but I have the 18mm which barlows well but not all my scopes have a 2" focuser so I'm torn.

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    Default Re: Question re 9mm vs 20 mm and a 2X Barlow

    Quote Originally Posted by paulmeyer View Post
    The ES sale has me thinking of buying a 2 inch 100 degree 9mm. I already have the 2 inch 20mm 100 degree (Love it) and a 2X Barlow. Would it be worthwhile to get the 9mm or would the view basically be the same as the 20 with a Barlow?
    They are both pretty decent EP's....IMHO, the 9mm would be the better choice of the two if that was the choice...I used mostly just the 9mm for quite a while before acquiring the others....It always worked great for me.....The 20mm has been a bit of a challenge for me to warm up too....

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    Default Re: Question re 9mm vs 20 mm and a 2X Barlow

    Quote Originally Posted by Ozman13 View Post
    If I had the 20mm and like the view when barlowed, I would look for something other than the 9mm. I have the 82s except for the 8.8mm and 4.7mm and this sale has me thinking about the 8.8mm but I have the 18mm which barlows well but not all my scopes have a 2" focuser so I'm torn.
    I like the image but of course looking for better if it can be had. Again just wondering if the views through the 9 mm would be appreciably better than the 20mm with the Barlow

    Quote Originally Posted by MoosBros View Post
    They are both pretty decent EP's....IMHO, the 9mm would be the better choice of the two if that was the choice...I used mostly just the 9mm for quite a while before acquiring the others....It always worked great for me.....The 20mm has been a bit of a challenge for me to warm up too....
    I doubt I would get rid of the 20mm as I do like the views but like I said before just wondering if the 9 mm has a place if one already had the 20 mm and a Barlow which I do indeed have.
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    Celestron C9.25 XLT w/ Feathertouch Microfocuser on an AVX mount
    Baader Click Lock Star 2 inch Diagonal with Baader 2" SCT Click Lock EP Adapter with Antares Twist lock 2" to 1.25" adapter
    2 inch ES 100* 5.5mm and 20mm + Baader Hyperion Mark III Zoom
    Baader and Agena Barlows
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    Default Re: Question re 9mm vs 20 mm and a 2X Barlow

    I have the 9mm. I use it all the time in my f/5 newt. My 5.5mm sees limited use when the sky is steady. I prefer the actual eyepiece over a barlowed eyepiece. Plus, with the 100* series, a barlow makes it quite long. Here's the barlowed 9mm. It would be slightly more magnification than a 20mm barlowed. Plus, my eyepieces seem to be nearly parfocal (5.5mm, 9mm, 18mm 82*, 24mm 82*). A slight focus adjustment brings them in. With the barlow, I have to move it quite a bit. I usually only use the end glass of the barlow for a 1.5x.

    20150917_192851.jpg20150917_193004.jpg
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    Default Re: Question re 9mm vs 20 mm and a 2X Barlow

    That's a good point. The Barlow with the 2 inch EP is a big ol honkin piece hangin off the scope. Another good point is the focusing. It is somewhat of a pain to refocus if you bounce between them
    Celestron C9.25 XLT w/ Feathertouch Microfocuser on an AVX mount
    Baader Click Lock Star 2 inch Diagonal with Baader 2" SCT Click Lock EP Adapter with Antares Twist lock 2" to 1.25" adapter
    2 inch ES 100* 5.5mm and 20mm + Baader Hyperion Mark III Zoom
    Baader and Agena Barlows
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    Default Re: Question re 9mm vs 20 mm and a 2X Barlow

    In theory good barlow should not degrade the image, so for simpler EPs optically it should be about the same. However, complex EPs like ES 100* line have been designed for optimal eye placement. Barlow typically increases eye relief and thus may shift eye placement away from optimal.

    Also, barlow adds weight and raises EP higher. So, I personally prefer to have EPs covering all range of magnifications and would only use barlow occasionally.
    Last edited by Bigzmey; 04-06-2016 at 12:47 AM.

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    Default Re: Question re 9mm vs 20 mm and a 2X Barlow

    Had a great session Sunday with my Barlowed 20 mm and Jupiter so still struggling to decide whether to pony up another 300 bucks.
    Celestron C9.25 XLT w/ Feathertouch Microfocuser on an AVX mount
    Baader Click Lock Star 2 inch Diagonal with Baader 2" SCT Click Lock EP Adapter with Antares Twist lock 2" to 1.25" adapter
    2 inch ES 100* 5.5mm and 20mm + Baader Hyperion Mark III Zoom
    Baader and Agena Barlows
    NexImage 5

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