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Thread: Explore Scientific 40mm or Tele Vue 55mm

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    Question Explore Scientific 40mm or Tele Vue 55mm



    I am just converting my 11 inch Celestron CPC from 1.25 inch to a 2 inch diagonal. I have already purchased the Celestron Luminos 19mm eyepiece and am now wanting to obtain a high quality lens for wider views of nebula, etc. Given the focal ratio of the telescope (10), even the 55mm Tele Vue produces an exit pupil of only 5.5 so the 55mm is not out of line with this scope. However, since I do not have experience with either the Expore Scientic or the Tele Vue lenses I wanted to seek some advice on which direction I should lean. I like the construction of the Explore Scientific with the 69 degree AFOV, the 31mm eye relief and the 32 oz weigh (seems built well) priced at $309, but the wider views of the 55mm Tele Vue Plossl-550 is very intriguing at only $244, but only 50 degree AFOV, but a very nice 38mm eye relief. Would love some insight and advice as I am very new to this.

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    Default Re: Explore Scientific 40mm or Tele Vue 55mm

    The TV Plossls are very nicely done. Older versions transmit more light. The TV will provide close to the maximum TFOV possible in a 2" draw tube. A 2" drawtube limits the TFOV. The TV Panoptic 41mm is actually optimized to provide the maximum TFOV explicitly with a 68 degree AFOV but costs about $525. The TV 55mm Plossl will give the same TFOV in a 50 degree AFOV at less than half the price of the 41mm Panoptic.

    When I got my Panoptic 41mm I was observing under more light polluted conditions so needed more magnification, a smaller exit pupil to darken the skies. Someday I'd like to get the 55mm Plossl to complete my set but for now I've got that range covered otherwise, so not a priority.

    The ES 31mm 70 degree AFOV will not have the property of showing the maximum TFOV in your 2" scope. But if you observe from light polluted skies you might need the higher magnification to darken the sky background.

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    Default Re: Explore Scientific 40mm or Tele Vue 55mm

    Telescopes: Assorted brands and designs from 60mm up to 203mm (9). Eyepieces: Two 6mm BO's (Brown Organics - Eye Balls). Mounts: Celestron, Meade, Orion, Vixen, Skywatcher. Cameras: Canons, Logitech, Orion, QHYs.

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    Default Re: Explore Scientific 40mm or Tele Vue 55mm

    Quote Originally Posted by Johnny J. View Post
    Yes an excellent choice. Not as pricey as the Panoptic 41mm but it would maximize the TFOV and darken the sky a bit in light polluted areas.
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    Default Re: Explore Scientific 40mm or Tele Vue 55mm

    Quote Originally Posted by not_Fritz_Argelander View Post
    The ES 31mm 70 degree AFOV will not have the property of showing the maximum TFOV in your 2" scope. But if you observe from light polluted skies you might need the higher magnification to darken the sky background.
    The above is an error due to my misreading.

    The 40mm ES should be comparable in performance to the 41mm Panoptic with a tad more stray scattered light.

    The Vixen suggested in post #3 is an excellent lower cost alternative.
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    Default Re: Explore Scientific 40mm or Tele Vue 55mm

    55mm Plossl is handy to have for SCTs. It gives 5.5mm exit pupil which could be useful on large DSO and faint comets under dark skies. But as nFA indicated it suffers from contrast loss under light polluted skies. 40mm will show a bit darker sky background, but image will still be washed out under LP skies.

    ~30mm 82 degree FOV or ~35mm 70 degree EPs produce similar to 55mm Plossl true field of view but with smaller exit pupil, and can be used under both dark and LP skies.

    I will put forward another option for you: Baader Aspheric 72 deg, 36mm. IMO it is a perfect match for SCT. I liked it so much that I picked 31mm version (not that one need both ).

    https://agenaastro.com/baader-36mm-h...-eyepiece.html

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    Default Re: Explore Scientific 40mm or Tele Vue 55mm

    Quote Originally Posted by not_Fritz_Argelander View Post
    The TV Plossls are very nicely done. Older versions transmit more light. The TV will provide close to the maximum TFOV possible in a 2" draw tube. A 2" drawtube limits the TFOV. The TV Panoptic 41mm is actually optimized to provide the maximum TFOV explicitly with a 68 degree AFOV but costs about $525. The TV 55mm Plossl will give the same TFOV in a 50 degree AFOV at less than half the price of the 41mm Panoptic.

    When I got my Panoptic 41mm I was observing under more light polluted conditions so needed more magnification, a smaller exit pupil to darken the skies. Someday I'd like to get the 55mm Plossl to complete my set but for now I've got that range covered otherwise, so not a priority.

    The ES 31mm 70 degree AFOV will not have the property of showing the maximum TFOV in your 2" scope. But if you observe from light polluted skies you might need the higher magnification to darken the sky background.
    Many thanks. I am under fairly light polluted skies as I am just in the suburbs of Columbus, Ohio. It looks like I can get to a fairly dark zone with about a 1 hr drive, but have not made the trip yet as I just moved her in November. It sounds like I should stay in the mid 30's to 40mm range given the light pollution.

    Johnny J. and Bigzmey, I appreciate the other options and will spend a bit of time researching those as well.

    Thanks again.
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    Default Re: Explore Scientific 40mm or Tele Vue 55mm

    All suggestions given thus far are great recommendations. As not_Fritz eluded to, the TV 55 Plossl gets better with darker skies. Under light polluted skies, it sometimes lacks contrast and details. I love mine (the older (NJ) type), but skies have to cooperate, even in an SCT. One other option that will give you basically the max FOV is the Masuyama 32mm 85° EP. While I've never used one myself, their design lends itself to the slower ratio scopes, and in reviews and user reports it sounds amazing in SCT optics. https://agenaastro.com/masuyama-2-in...mm-mop-32.html
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