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Thread: Which 5x barlow should I get - three or four elements?

  1. #1
    ramdom's Avatar
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    Default Which 5x barlow should I get - three or four elements?



    I'm thinking of getting a 5x barlow to magnify some of the tinier (mostly planetary) objects at prime focus for imaging purposes with my ASI120MCS (and perhaps visualisation but I don't imagine it would be needed). Has anyone used these and is there a difference in quality between the three element and four element barlows? I did a search and couldn't find anything relevant.

    OPT: $59.95 - 3 element - https://www.optcorp.com/opt-5x-apo-b...ns-b5125.html?

    Highpoint: $49.95 - 3 element - 5x APO Barlow Lens 1.25" by High Point

    Orion: $149.99 - 4 element - Orion High-Power 1.25" 5x 4-Element Barlow Lens | Orion Telescopes

    ES: $115.99 - 4 element - Explore Scientific 5x Focal Extender (1.25") FE05-125 B&H

    VITE: $19 - 3 element - http://www.amazon.com/VITE-Barlow-1-.../dp/B00NG61JIW

    Not sure if the last two can accept filters or not but it's something to keep in mind (and I can ask them).

    This is for 1.25" eyepieces. At some point I will move to a 2" setup if that's relevant. Thanks a lot.

    --Ram
    Tubes: Celestron 9.25" 235mm f/10 XLT EdgeHD SCT; Meade ETX 80mm f/5 achromat; Coronado SolarMax II 60mm f/6.6 Hα <0.7Å BF10 solar; Stellarvue 70mm f/6 triplet apochromat; Obsession UC18 457mm f/4.2 with Argo Navis & ServoCAT; Takahashi FS128 5" f/8.1 and FC100DF 4" f/7.4 fluorite doublet apochromats. Mounts: AVX; LXD75; Paramount MyT. Eyepieces: 2" Tele Vue Ethos 4.7/13/21mm, Paracorr, 2,4x Powermate; Stellarvue 0.8x, Takahashi 0.7x, 0.66x reducer/corrector. Cameras: ZWO ASI120MC-S; Lodestar X2c; X2m; Canon T7i; QHY163M; QHY247C. Filters: Astrodon 5nm Ha, 3nm O3 and S2.
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    Default Re: Which 5x barlow should I get - three or four elements?

    i think 1st two are rebranded GSO 5X
    you should also consider Televue 5x
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    color="#b22222">Telescope: 10" F3.9 Orion Astrograph on Skywatcher EQ6-R Pro
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    Default Re: Which 5x barlow should I get - three or four elements?

    Quote Originally Posted by geethq View Post
    i think 1st two are rebranded GSO 5X
    you should also consider Televue 5x
    Yes if you consider $100+ why not Televue?

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    Default Re: Which 5x barlow should I get - three or four elements?

    I got a 5x barlow, the orion 4 element, works quite well but the thing is a royal pita to use.

    Just saying.
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    Default Re: Which 5x barlow should I get - three or four elements?

    I agree UM. I have a 5x barlow a few years now. Not tried using it much. Never actually managed to get it to focus on anything as of yet Was trying Monday evening but the clouds rolled in
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    Default Re: Which 5x barlow should I get - three or four elements?

    The field of view is very narrow and the focus 'sweet spot' is even narrower.

    I have only tried to use it a couple of times with my ccd planetary cam but got much better results with the 2x.
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    Default Re: Which 5x barlow should I get - three or four elements?

    Thanks - yeah, if I go the 5x route, it looks like the Televue would be the best bet - thanks for the recommendation. I am also thinking about the Televue 3x but it looks like the Televue 4 element barlows appear to the best of them. I really need to get back to imaging planets to see what happens with Jupiter and Saturn with my 2x Barlow. Switching back and forth between planets and DSOs with my single scope is a PITA since I have a F/6.3 focal reducer that covers my OTA and keeps it free from bugs, etc. which I'm loathe to remove to view planets and put a Barlow in to get the biggest view to fit my planetary camera sensor.

    --Ram
    Tubes: Celestron 9.25" 235mm f/10 XLT EdgeHD SCT; Meade ETX 80mm f/5 achromat; Coronado SolarMax II 60mm f/6.6 Hα <0.7Å BF10 solar; Stellarvue 70mm f/6 triplet apochromat; Obsession UC18 457mm f/4.2 with Argo Navis & ServoCAT; Takahashi FS128 5" f/8.1 and FC100DF 4" f/7.4 fluorite doublet apochromats. Mounts: AVX; LXD75; Paramount MyT. Eyepieces: 2" Tele Vue Ethos 4.7/13/21mm, Paracorr, 2,4x Powermate; Stellarvue 0.8x, Takahashi 0.7x, 0.66x reducer/corrector. Cameras: ZWO ASI120MC-S; Lodestar X2c; X2m; Canon T7i; QHY163M; QHY247C. Filters: Astrodon 5nm Ha, 3nm O3 and S2.
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    Default Re: Which 5x barlow should I get - three or four elements?

    Yup dso and planetary are two very different approaches. I would suggest to concentrate on one or the other for an evening. Remove the reducer for the planetary for the night.

    Flipping 'modes' back and forth is not only a pain but can lead to easy mistakes, like recently I pulled up focus on an object started taking subs, realized I left the filter out. Stopped it, put the filter in, restarted the subs. 80 minutes later I decided to look at progress and ... 80 minutes worth of out of focus trash
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