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  1. #1
    WWPierre's Avatar
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    Default Seibert 35mm eyepiece



    In a previous thread, I mentioned that I had ordered this, and it was suggested that the lowest magnification my scope was capable of would be around 20x whereas this EP would yield 18.5x. Of course, I wondered what effect I would experience.

    Well, I haven't been able to try it out on a starfield yet, but terrestrial viewing has shown that there is a small out of focus spot which moves around, presumably with the changes in alignment between the exit pupil and the MarkI eyeball. As well, a ghost of the spider and secondary mirror can also momentarily appear. I am assuming that these observations are the result of pushing my scope beyond the capabilities of the basic optics.

    Other than that, the views around these anomalies were crisp and clear, and I will probably be keeping the eyepiece, depending on how it performs on the heavens. A layer of cirrostratus prevents me from testing at the moment.

    The eyepiece is featured on this page.

    If I am dissatisfied, I may send it back with the difference in cash, and order the 30mm on this page.

    Incidentally, I did notice that the focus "sweet spot" was noticibly wider for this eyepiece. Is this normal for all higher numbered eyepieces?

    For the number crunchers among you, do these empirical observations correspond to optical theory?

    Here is the eyepiece.
    Attached Images Attached Images
    Meade 16" LightBridge; Celestron G-8N Bird-Jones/motorized EQ5; Orion 127 Mak/go-to EQ5; Burgess 127f8 refractor; Sky-Watcher 5" F/5 collapsible dob; 90mm Mak/motorized EQ2; Royal Astro 76/910-GEM; Meade 60x700 refractor/alt/az; Zhumell 25x100 Coin Ops; GalilleoScope. Celestron 8mm-24mm zoom; lots of fixed EPs,some good, some..not so much. A small collection of surveying instruments; a forest of tripods; Canon Rebel Xti. Confirmed gadget junkie; Custodian of the Magnetic North Pole (Send $1.00 to Pierre each time you use a compass.)
    49-41-37.03N 123-09-29.61W Calculated magnetic declination: 17° 39' East

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  2. #2
    WWPierre's Avatar
    WWPierre is offline HYPER GIANT
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    Default

    The CS has dissapated and I have had a chance to evaluate this eyepiece on some starfields. It is pretty fantastic. I focused it on the moon first, and then I just roved around in the moonlight, as she was drowning out everything naked eye. Stars were nice and crisp right to the edge of the FOV. There was no sign of the anomalies I was seeing in daylight. This eyepice is definitely a keeper, and IMHO a great value for $69. I hope the weather holds until after the moon wanes. I can't wait to see the Pleades with this eyepiece. As Andy would say, I am dead chuffed with it.
    Meade 16" LightBridge; Celestron G-8N Bird-Jones/motorized EQ5; Orion 127 Mak/go-to EQ5; Burgess 127f8 refractor; Sky-Watcher 5" F/5 collapsible dob; 90mm Mak/motorized EQ2; Royal Astro 76/910-GEM; Meade 60x700 refractor/alt/az; Zhumell 25x100 Coin Ops; GalilleoScope. Celestron 8mm-24mm zoom; lots of fixed EPs,some good, some..not so much. A small collection of surveying instruments; a forest of tripods; Canon Rebel Xti. Confirmed gadget junkie; Custodian of the Magnetic North Pole (Send $1.00 to Pierre each time you use a compass.)
    49-41-37.03N 123-09-29.61W Calculated magnetic declination: 17° 39' East

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  3. #3
    Lenbo's Avatar
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    Default

    Glad to hear it worked out. Is "dead chuffed" above excellent? Enjoy the new eyepiece.
    Len
    Astro Tech 150mm mak f/12 -
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    8 inch reflector f/4.9 - VRC8 (RC Mod for Mallincam)
    Orion Atlas EQ mount - EQMOD
    TV Radian 6 mm / Baader Hyperion Eyepieces 8,13,17,24 mm / Meade SWA 28,34 mm/ES 82 11mm

 

 

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