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Thread: 5.5mm Bresser 'Plossl' Disassembly

  1. #1
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    Default 5.5mm Bresser 'Plossl' Disassembly



    Five element, sixty degree AFOV.

    IMG_20170328_113441.jpg
    IMG_20180207_162213.jpg
    IMG_20180207_162410.jpg
    IMG_20180207_164312.jpg
    IMG_20180207_164420.jpg

    I always assumed these were a five element Astroplanokular design. It is a 1-1-3 configuration however as far as I can tell (at least on the 5.5mm).
    TS Optics: 150mm, f/6 Newtonian (GSO SVD series). Altair: Starwave 102ED-R. Sky-Watcher: SkyMax 102mm, SkyMax 127mm, Evostar 72ED DS Pro, Evostar 80ED DS Pro, ST80 (TS Focuser), ST102 (TS Focuser), EQ5 Deluxe, AZ5 Deluxe. Vixen: Porta II, SXG Hal-130. Orion: 90mm StarMax , ST80 (TS Focuser). Celestron: NexStar Evolution 9.25". William Optics: E-BINO-P Binoviewer. A shed load of eyepieces including: Antares, Astro Hutech, Baader, Bresser, BST, Bushnell, Celestron, Explore Scientific, GSO, Kokusai, Meade, Orion, Sky-Watcher, Solomark, SvBony, TeleVue, Vixen & one or two I'm not sure of.

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    Default Re: 5.5mm Bresser 'Plossl' Disassembly

    Hello Shorty Barlow,

    well, another nonPlössl.
    On one day, Georg Simeon Plössl wil leave his tomb and punish all these manufacturers, ha, ha.

    Thank you for the report and for the dissection,

    JG

    PS: Are there still any EP left for the dissection?
    Binoculars: Leica Ultravid 7x42, 8x42HD; Swarovski EL 8.5x42 Swarovision; Nikon 10x70 Astroluxe; Docter Nobilem 7x50 Porro; Jenoptem 7x50W, 10x50W; BA8: 10.5x70, 15x85; 25x100FB, AsahiPentax 8x40, Refractors: Sky-Watcher 150mm/750mm; Leica APO Televid 82mm (25x-50x WW ASPH); EPs:Baader Classic Orthos; Fujiyama ortho, Leica B WW, ultrawide zoom ASPH, Periplan GF, HC Plan S, L; DOCTER UWA; Wild UW mil; Tele Vue Delos, Nagler Zoom, Plössls; Swarovski SW; Pentax XW; ZEISS diascope B WW T*, Carl Zeiss E-Pl; Hensoldt mil; Filters: Astrodon, Astronomik, Baader (CCD), TS;
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    Default Re: 5.5mm Bresser 'Plossl' Disassembly

    The design of the 5.5mm seems a bit sui generis to me. Labelling it a Plossl is a bit of a stretch though lol. I don't have any immediate plans to dissect any more EP's, I'll have to see.
    TS Optics: 150mm, f/6 Newtonian (GSO SVD series). Altair: Starwave 102ED-R. Sky-Watcher: SkyMax 102mm, SkyMax 127mm, Evostar 72ED DS Pro, Evostar 80ED DS Pro, ST80 (TS Focuser), ST102 (TS Focuser), EQ5 Deluxe, AZ5 Deluxe. Vixen: Porta II, SXG Hal-130. Orion: 90mm StarMax , ST80 (TS Focuser). Celestron: NexStar Evolution 9.25". William Optics: E-BINO-P Binoviewer. A shed load of eyepieces including: Antares, Astro Hutech, Baader, Bresser, BST, Bushnell, Celestron, Explore Scientific, GSO, Kokusai, Meade, Orion, Sky-Watcher, Solomark, SvBony, TeleVue, Vixen & one or two I'm not sure of.

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    Default Re: 5.5mm Bresser 'Plossl' Disassembly

    Closer view of the third lens group.

    IMG_20180207_221543.jpg

    I think a thin line can be perceived in the larger of the bisected halves of the group. This could be evidence of a triplet.
    TS Optics: 150mm, f/6 Newtonian (GSO SVD series). Altair: Starwave 102ED-R. Sky-Watcher: SkyMax 102mm, SkyMax 127mm, Evostar 72ED DS Pro, Evostar 80ED DS Pro, ST80 (TS Focuser), ST102 (TS Focuser), EQ5 Deluxe, AZ5 Deluxe. Vixen: Porta II, SXG Hal-130. Orion: 90mm StarMax , ST80 (TS Focuser). Celestron: NexStar Evolution 9.25". William Optics: E-BINO-P Binoviewer. A shed load of eyepieces including: Antares, Astro Hutech, Baader, Bresser, BST, Bushnell, Celestron, Explore Scientific, GSO, Kokusai, Meade, Orion, Sky-Watcher, Solomark, SvBony, TeleVue, Vixen & one or two I'm not sure of.

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    Default Re: 5.5mm Bresser 'Plossl' Disassembly

    Quote Originally Posted by Shorty Barlow View Post
    The design of the 5.5mm seems a bit sui generis to me. Labelling it a Plossl is a bit of a stretch though lol. I don't have any immediate plans to dissect any more EP's, I'll have to see.
    Another very interesting result, thanks!
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    EQG

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    Default Re: 5.5mm Bresser 'Plossl' Disassembly

    Quote Originally Posted by not_Fritz_Argelander View Post
    Another very interesting result, thanks!
    You're welcome. I've often been told these were Erfles although they are marketed as 'Plossls'. I've also been told they are an Astroplanokular based design. I used to jokingly refer to them as Plerfles.

    It seems they are neither Erfle or Astroplan but something else. Two or three people have told me that they don't perform well in scopes faster than f/6. I have the 5.5mm, 9mm, 14mm and 20mm of these.

    IMG_20170328_113441.jpg
    IMG_20170310_171057.jpg

    Yet I find they perform well in an f/5 short tube achromat.
    TS Optics: 150mm, f/6 Newtonian (GSO SVD series). Altair: Starwave 102ED-R. Sky-Watcher: SkyMax 102mm, SkyMax 127mm, Evostar 72ED DS Pro, Evostar 80ED DS Pro, ST80 (TS Focuser), ST102 (TS Focuser), EQ5 Deluxe, AZ5 Deluxe. Vixen: Porta II, SXG Hal-130. Orion: 90mm StarMax , ST80 (TS Focuser). Celestron: NexStar Evolution 9.25". William Optics: E-BINO-P Binoviewer. A shed load of eyepieces including: Antares, Astro Hutech, Baader, Bresser, BST, Bushnell, Celestron, Explore Scientific, GSO, Kokusai, Meade, Orion, Sky-Watcher, Solomark, SvBony, TeleVue, Vixen & one or two I'm not sure of.

 

 

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