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Thread: 15mm Plossls shootout

  1. #21
    Trombatissimo's Avatar
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    Default Re: 15mm Plossls shootout



    Quote Originally Posted by SpyderwerX View Post
    In conversations I had with Gabby and JG, we all spoke of seeing a slight color shift in the new design. An ever so slight tint of what I refer to as a tobacco hue, or slightly amber. A coating effect I'm sure. As not_Fritz stated, why the changed is any ones guess.
    Al Nagler was asked about this at NEAF or possibly at a Stellafane event and he said it was a supplier issue. They changed coating formulations and procedures with new equipment and the old process was no longer possible due to ecological issues with the byproducts of the earlier coating methods. The supplier also stated that the new coatings would be more durable with less production batch variations which would assure better matching for bino pairs. Al felt that on balance it was "win in some areas and lose in others" when he did his own comparisons, so if he had the choice, he would have offered both with a "max transmission" and a "max contrast" variant, but as this was not possible, it is what it is. He did acknowledge the tint issue in the later Plossls, also noting that different color renditions were seen in various focal lengths of Type 4, 5, & 6 Nagler eyepieces, but he stated that this was a trade off which he felt was preferable to compromising the contrast and anti-reflection performance which was the reason for using different treatments on each eyepiece.

    He also pointed out that all the first generation Naglers made in New Jersey had darker coatings than the made in Japan models. The first Taiwanese built Naglers had the same blue tinted eye lens coatings as the Japanese models, but just before the switch to the third generation housing design, they switched to the greenish coatings. His tests revealed no significant transmission, contrast, or color differences between these production runs, but each successive coating change did supress reflections better than the previous versions. Customers did claim to see differences with praise outweighing complaints by a comfortable margin.
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  3. #22
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    Default Re: 15mm Plossls shootout

    Quote Originally Posted by Bigzmey View Post
    Nice set of 15mm there Shorty! I never tried GSO, but suspected that they would be on pair with Meade. Yes, NPL body design is a bit odd. I was expecting eyeguard to be adjustable. After some pulling and twisting attempts I realized that it is fixed, but the shallow rubber ridge which passes for the eyeguard can be easily removed or attached back. What I like though that the design maximizes effective eye relief and I can press my eye glasses tight against the rubber ridge without danger of scratching glasses or the lens.

    Thanks for the info on the Vixen eyeguards, they are not unlike those used on Takahashi ortho's from what I've seen. The weird plastic twist-up eyeguard starts at the 20mm I think. I have the 25mm & 30mm and they get used a lot.

    IMG_20171202_130830.jpg

    I've had the 30mm NPL about three years and the slightly rickety 'Christmas cracker' plastic eyeguard still works. I expected it to last five minutes lol. I must admit it's my favourite 30mm eyepiece, it's actually my only 30mm EP.

    IMG_20170713_095107.jpg
    IMG_20180208_164647.jpg

    I have other 15mm eyepieces, although they're hardly Plossls. I think the Meade Plossls are underrated, they're at least as good as the GSO's, the two 15mn Plossls do have different focal points however. This may be indicative of their performance in various focal ratio scopes.
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  5. #23
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    Default Re: 15mm Plossls shootout

    Quote Originally Posted by Trombatissimo View Post
    Al Nagler was asked about this at NEAF or possibly at a Stellafane event and he said it was a supplier issue. They changed coating formulations and procedures with new equipment and the old process was no longer possible due to ecological issues with the byproducts of the earlier coating methods. The supplier also stated that the new coatings would be more durable with less production batch variations which would assure better matching for bino pairs.
    ...
    Hello Ken,

    and thanks for reproducing this explanation by Al Nagler.

    Well, the both generations of the TeleVue Plössls are totally different, not only different coatings.

    The 'new' darker multicoatings remind me of those frequently used on the optics manufactured in China and Taiwan.
    The older 'clearer' multicoatings are more typical for the Schott glass materials. Today, these are the Zeiss HT multicoatings.

    Not only the multicoatings, but Tele Vue has also changed the sequence of the Plössls focus lengths
    from the old: 55 40 32 26 21 17 13 10.4 7.4 (according to Company 7)
    to the new: 55 40 32 25 20 15 11 8

    So, all in one, it looks like a costs saving initiative at Tele Vue.

    Best,

    JG
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