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Altair ULTRAFLAT Eyepiece

Discussion in 'Eyepieces, Barlows, and Filters' started by Mak the Night, Apr 3, 2019.

Altair ULTRAFLAT Eyepiece

Started by Mak the Night on Apr 3, 2019 at 4:16 AM

69 Replies 7436 Views 0 Likes

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  1. Leonard

    Leonard Well-Known Member

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  2. Mak the Night

    Mak the Night Well-Known Member

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    Fixed that for you lol.

    imagefx2.jpg

    That looks really stable. I only use my EQ5 with a 150mm Newtonian.

    gRHprmy.jpg

    The AZ5 gets used with my smaller refractors, although originally it actually came supplied with a 127mm SkyMax Maksutov. Here they are cooling down in twilight before a lunar session on Tuesday.

    jjXNzF3.jpg

    It only has a 1.25 focuser too although I can rotate the visual back locking ring so the fastening screws are in a convenient place. I had some problems Tuesday with the newer WO Amici diagonal.

    36dtTRt.jpg

    The drawtube compression ring wouldn't hold certain eyepieces securely.

    tGgnqK5.jpg

    Principially these two Barsta made EP's with virtually identical undercuts. It would hold smooth barrelled eyepieces.

    Cfklcn7.jpg

    Luckily I had a spare helical from an old borked WO eyepiece that fitted.
     
  3. Mak the Night

    Mak the Night Well-Known Member

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    Oh yeah, I finally got to test the ULTRAFLAT with the ED80.

    IMG_20190517_113641.jpg

    I'm very impressed. The colour, definition, sharpness and overall contrast were excellent. I could detect no aberrations or astigmatism across the entire FOV, bearing in mind that the ED80 is f/7.5. So I'm not sure if this would be the case at f/4.9. It gave 40x with a 2mm exit pupil and 1 arc degree : 37 minutes : 30 seconds of TFOV. I'm not sure if I'll get any more of the range. I already have 19mm and 24mm TV Panoptics so there's not much point buying the 18mm or 24mm ULTRAFLAT.
     
  4. Mak the Night

    Mak the Night Well-Known Member

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    smaller.jpg

    You can see how I've rotated the focuser screws to the left on the Mak visual back. I'm not sure whether these can be converted to 2" or not. Seems a bit pointless with a Mak though to me as I predominantly use eyepieces of less than 10mm focal length.
     
    Last edited: May 17, 2019
  5. Don Pensack

    Don Pensack Vendor

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    Just a note to say that these KUO UltraFlat Field eyepieces are now sold under the
    APM UltraFlatField
    Altair UltraFlat
    Meade UHD
    Celestron Ultima Edge
    Tecnosky Ultra Flat (only the 30mm)
    and Orion UltraFlat (all but the 30mm)
    labels.
     
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  6. Mak the Night

    Mak the Night Well-Known Member

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    I still can't find anything that looks like them on the KUO site.
     
  7. Mak the Night

    Mak the Night Well-Known Member

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    I still can't find anything that looks like them on the KUO site.
     
  8. Don Pensack

    Don Pensack Vendor

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    APM had the exclusive for 2 years, but now they are appearing under many labels, even Svbony (10mm length only).
    They were designed in the US by Mark Ackermann.
    KUO makes many eyepieces not shown on their website.
    It has become common for manufacturers not to advertise all the eyepieces they sell on their own websites, but usually to only offer a sample of what they make.
     
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  9. Don Pensack

    Don Pensack Vendor

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    APM had the exclusive for 2 years, but now they are appearing under many labels, even Svbony (10mm length only).
    They were designed in the US by Mark Ackermann.
    KUO makes many eyepieces not shown on their website.
    It has become common for manufacturers not to advertise all the eyepieces they sell on their own websites, but usually to only offer a sample of what they make.
     
  10. PXR-5

    PXR-5 Active Member

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    Thanks Don, that clears some things up for me ;)
     
  11. Mak the Night

    Mak the Night Well-Known Member

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    OK, thanks for the info Don.
     
  12. Mak the Night

    Mak the Night Well-Known Member

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    OK, thanks for the info Don.
     

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