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  1. J

    Astro eyepieces with Kowa 883

    Hi John, thank you for these data points! Joachim
  2. J

    Astro eyepieces with Kowa 883

    Hi, yes, there are two adapters available - one with an external screw and one with a grub screw which goes in deeper and thus allows for a millimeter or two of backfocus - which might be the difference between coming to focus at infinity or not. Handling is obviously easier with the external...
  3. J

    Astro eyepieces with Kowa 883

    Hi, you might be lucky as a barlow lens will generally put your focus plane farther out. Btw, 333x on a 3.5" refractor is just a bit over the top - even if we assume you have seeing which would support this magnification (usual rule of thumb is 50 or 60x per inch of aperture). Sth. around 200x...
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