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Thread: 18mm Edmund Ortho pick up

  1. #1
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    Default 18mm Edmund Ortho pick up



    Edmund put a couple of their ortho eyepieces on clearance pricing. I don't have any Orthoscopic eyepieces, so I decided to try the 18mm for $45.95 plus shipping. It arrived a couple of days ago. Finally got a chance to try it out just after sunset today in my 90mm mak.

    Venus - super bright as usual, so I plopped in a 13% moon filter. Was able to now see that it was about 3/4 of Venus visable. Always fun to check the phase. No other detail of course.

    Moon - the real reason I came out on my deck. Checked out the bright monster with and without the moon filter. I get why people are into these ortho eyepieces. Gives a very sharp and clean image that seemed to snap into focus with ease. As sharp a view of the moon as I have had with my little mak. The 18mm ortho gives me about 70x in my mak.

    There is a front about to come through and it was getting super windy so I came in after only about 20 minutes. So I will have to check out some stars and see how it takes to a barlow on another night. But other than the narrow fov it seems like a very nice eyepiece for the moon and planets. Don't think I could give up my wider fov eyepieces on dso's though.

    Hers a link if you want to check them out.
    Orthoscopic Eyepieces
    Eric

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    Celestron Evo 8 SCT / Orion 90mm Mak / Aquila 90mm f5.5 achro / Coronado PST / Oberwerk LW 11x70 Binos - Eyepieces; Russell 50mm SP / Levenhuk 40mm 68* / 32mm Masuyama 85* / Edmund 28mm RKE / TV 22mm, 17mm T4 Nag / Baader Morpheus 14mm, 9mm / Meade 5000 5.5mm / Baader Zoom / Zhumell Zoom - Filters; DGM NPB, 1000 Oaks OII, Baader Moon & Skyglow, Orion Solar Filter

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    Default Re: 18mm Edmund Ortho pick up

    The 18mm is a very nice eyepiece and I hope you get a lot of use from it. I replaced mine about 2 years ago with a Fujiyama 18mm, either new glass or coatings but it edged out the Edmunds by enough to change.
    If you do not mind a 30* AFOV the 12.5mm Hastings triplet is another great Edmunds eyepiece.
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    Amici prism, 2" Stellarvue Dielectric, 2" TeleVue Everbrite
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    The weakest link in the optical chain is the large nut located directly behind the eyepiece/ camera. - Gabrielle
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    Default Re: 18mm Edmund Ortho pick up

    Quote Originally Posted by Gabby76 View Post
    The 18mm is a very nice eyepiece and I hope you get a lot of use from it. I replaced mine about 2 years ago with a Fujiyama 18mm, either new glass or coatings but it edged out the Edmunds by enough to change.
    If you do not mind a 30* AFOV the 12.5mm Hastings triplet is another great Edmunds eyepiece.
    Never heard of the 12.5 Hastings triplet. Would certainly be fun to try. That is probably too narrow for me though.

    I'd really like to try the volcano top style orthos. Doesn't seem like anyone is producing them right now. Wonder why they fell out of favor?
    Eric

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    Default Re: 18mm Edmund Ortho pick up

    If you ever get a chance to use a TMB SuperMonocentric they are Hastings triplets. Incredible eyepieces for picking out fine detail on lunar/ planets/ nebula. Some people find the field of view and eye relief to tight for their comfort.
    I have never really heard a good explanation of why the volcano tops were changed to flat tops though I have heard many times that some people were nervous about having a pointed object a couple of millimeters away from their eye.
    Though the Edmunds is not in the same class as the TMB it is still a fine eyepiece, the TMB rates with the Zeiss Abbe II
    8mm Dia x 12.5mm EFL Hastings Triplet Achromatic Lens
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    Refractors: Antares 105 f/15, Celestron 150 f/8, Stellarvue NHNG 80 f/6.9, TAL 100RS f/10, TS 102 f/11, UR 70 f/10, Vixen SD115s f/7.7
    Mounts: Celestron SLT w/ pier mod & EQ-3 tripod, Celestron hypertuned CG-5 w/ tracking motor & Argo Navis, Manfrotto 028B w/ Stellarvue M2C, Manfrotto 055PRO w/ 128RC, TAL-1 HD EQ, Vixen SXP w/ HAL-130 SXG & half pier
    Diagonals: 2" Astro-Physics MaxBright, 2" Zeiss/ Baader prism, 2" Baader Herschel Wedge (Photo Version), 2"
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    Amici prism, 2" Stellarvue Dielectric, 2" TeleVue Everbrite
    Eyepieces: A-Z

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    The weakest link in the optical chain is the large nut located directly behind the eyepiece/ camera. - Gabrielle
    Ya gotta keep this Apo/
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    thing in some balance of perspective. Apos are awesome, but long focus Achros aren't that far behind them - Siriusandthepup (CN)

    Refractors kick arse precisely because they don't hide behind excuses. That is, they have no obstructions to hide behind. - Jon Isaacs (CN)

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