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Thread: TeleVue Plossls and Barlow

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    Default TeleVue Plossls and Barlow



    Pursuant to my year end goal of trying something new I joined the "Order of the Green Letters", albeit in a small way. I have snagged two used TeleVue Plossls, 15mm and 20mm. Despite FOVs and eye relief limitations (inherent to the design) I have heard that they provide a very nice view. I have avoided the 11mm and shorter focal lengths as eye relief seems to become more of an issue. That brings me to Barlows which will give me greater magnification while preserving ER.

    My thought is that I can use a Barlow with the 15mm and get 7.5mm at 2x or 10mm using the lens only at 1.5x. The Barlow is a GSO shorty where the lens is removable and screws into an EP or diagonal as a filter would. My first question is how well do these eyepieces Barlow? Second, would it be better to obtain and use a TeleVue Barlow or will the GSO do as well? One downside is that the lens on the TeleVue Barlow will not fit on EPs or diagonals for 1.5x, or so I have been told.

    Lastly, is there any one of the TV Plossls that is a must-have.

    Thanks for any info.
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    Default Re: TeleVue Plossls and Barlow

    Hello Rogan,

    I can't speak for GSO shorty Barlow, as I don't have it. According to the web, it is an achromatic Barlow, but an APO Barlow might be a better choice.
    What I can say is, the old Tele Vue Plössls don't perform to my expectations on the Baader Q-Turret Barlow, which is otherwise fairly good on some other eyepieces.
    Best,

    JG
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    Default Re: TeleVue Plossls and Barlow

    Quote Originally Posted by j.gardavsky View Post
    Hello Rogan,

    I can't speak for GSO shorty Barlow, as I don't have it. According to the web, it is an achromatic Barlow, but an APO Barlow might be a better choice.
    What I can say is, the old Tele Vue Plössls don't perform to my expectations on the Baader Q-Turret Barlow, which is otherwise fairly good on some other eyepieces.
    Best,

    JG
    Thanks much. That's good to know. I don't want to have a potentially good eyepiece and hamstring it with a Barlow that doesn't allow it to perform up to it's full potential. I think at the very least a TV 2x is called for which is usually available used at a reasonabl price. I wouldn't have 1.5x but I could do a direct comparison with the GSO which could potentially give me the 1.5x.

    Also, just noticed that GSO has a very reasonably priced APO Barlow.
    Last edited by Rogan; 12-20-2016 at 08:30 PM.
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    Default Re: TeleVue Plossls and Barlow

    Gratz! I love mine.

    I can attest that TV Plossls (I tested 11, 15 and 20mm) barlow very well with TV 2x barlow. I did not try screwing in the nose portion for 1.5x. I just used for 2x on planets and double stars.

    15mm and 20mm are the ones I use most on DSOs. 11mm gets time on planets and double stars. One of the best views ever of Saturn I had with 11mm 2x barlowed in my ES 102APO triplet.

    I try 32mm TV Plossl pretty much every session but at the end I prefer the views in ES68 24mm (same FOV, darker skies) and Baader Aspheric 31mm (same mag much wider FOV). So 32mm TV Plossl may not be a keeper, but 11, 15 and 20mm are.

    I also tried older style (volcano top) 17mm and 7.4mm TV Plossls. Pinhole iris and short ER were really restricting for 7.4mm. I also liked better views in 18mm BCO and 20mm TV Plossl over 17mm TV PLossl, but that could be just exit pupil thing. Anyway, I sold both 7.4mm and 7.4mm.

    And I really like TV 2x barlow (not Powermate). It does not degrade at all image quality of TV Plossls and ES EPs. Interestingly, it does not barlow well Baader clasic orthos and JD reports that TV Plossl does not work with Baader Barlow, coincidence?
    Last edited by Bigzmey; 12-20-2016 at 08:45 PM.
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    Default Re: TeleVue Plossls and Barlow

    Bigzmey, how is the eye relief with the 11mm?
    "I've... seen things you people wouldn't believe; attack ships on fire off the shoulder of Orion; I've watched C-beams glitter in the dark near the Tannhauser Gate. All those... moments... will be lost... in time, like... tears... in rain."

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    Default Re: TeleVue Plossls and Barlow

    Quote Originally Posted by Rogan View Post
    Bigzmey, how is the eye relief with the 11mm?
    It is tight, but manageable when I take my glasses off.

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    Default Re: TeleVue Plossls and Barlow

    Personally, I feel you got the best two in the 15 and 20mm. I had the complete set, except the 40mm and 55mm for a few years and was quite happy with all, though the 15 and 20 were always my favorite.

    If you don't mind short eye relief, a barlowed 8mm TV Plossl always gave me pretty decent views of Jupiter, due to its somewhat subtly darker tint (some call it a coffee tint). Same with Mars, the barlowed short f/l Plossls, whether through the 2X or 3X barlows was wonderful, surface features were very easy too see. For the Moon, the TV Plossl has been one of my favorite lunar eyepieces of the ones I've owned.

    Saturn on the other hand, I never cared for in the TV Plossl. I felt the tint was a bit much on Saturn, as it's already a yellowish hue, and the combination with the TV's were sometimes a bit much for my taste.

    Finally, I'll state that when I owned them, I used them exclusively with the TV 2X and 3X barlows, and they performed very well with them. The only thing that keep me from stating that the combination is transparent vs unbarlowed eyepieces is because the TV Plossl, being of a modified design, do vignette in both of the 1.25" TV barlows. But if you're only barlowing for planets it's not an issue at all. I can't say how they barlow with other manufactures units or if they vignette in those barlows.
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    Default Re: TeleVue Plossls and Barlow

    Thanks all. I think that my best bet will be to go with the TV 2x. If I do add another it will be a toss-up between the 8 and 11. I will see how I like the 15 and 20 with and without the Barlow before adding. From what I have seen I should be able to snag a used TV Barlow for around $65.
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    Default Re: TeleVue Plossls and Barlow

    Hello Rogan,

    with the Tele Vue Barlow you'll be on the safe side, and not breaking the bank.
    Best,

    JG
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    Default Re: TeleVue Plossls and Barlow

    Quote Originally Posted by stargazer769 View Post
    If you don't mind short eye relief, a barlowed 8mm TV Plossl always gave me pretty decent views of Jupiter, due to its somewhat subtly darker tint (some call it a coffee tint). Same with Mars, the barlowed short f/l Plossls, whether through the 2X or 3X barlows was wonderful, surface features were very easy too see. For the Moon, the TV Plossl has been one of my favorite lunar eyepieces of the ones I've owned.

    Saturn on the other hand, I never cared for in the TV Plossl. I felt the tint was a bit much on Saturn, as it's already a yellowish hue, and the combination with the TV's were sometimes a bit much for my taste.

    Finally, I'll state that when I owned them, I used them exclusively with the TV 2X and 3X barlows, and they performed very well with them. The only thing that keep me from stating that the combination is transparent vs unbarlowed eyepieces is because the TV Plossl, being of a modified design, do vignette in both of the 1.25" TV barlows. But if you're only barlowing for planets it's not an issue at all. I can't say how they barlow with other manufactures units or if they vignette in those barlows.
    I agree with the tinting Steve, though I only have the 11mm left it works great on Jupiter but that is about the only target I use it on.
    I have used it with a 1.25" 2x Antares apo barlow and a 2" 1.6x Antares barlow and it works well in those.
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