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Thread: Meade Super Plossl 56mm Question

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    Default Meade Super Plossl 56mm Question



    Returned the Orion Q70 32mm and Q70 38mm. How would the Meade 56mm Super Plossl do with a 120mm f/8 refractor? What do you think of the Astromania 56mm Plossl?

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    Default Re: Meade Super Plossl 56mm Question

    Depends on whether you think the tradeoff with lower magnification/smaller AFOV is worthwhile. With a 2" barrel, you can max out the true field of view with around a 40mm with 65 degree AFOV, or around a 30mm with 82 degree AFOV, or the 56mm plossl. All will show about the same TFOV, everything you can fit in a 2" barrel.

    I had a 56mm for a while with my N11GPS - then decided to go with the 65 degree 40mm. I found the narrow AFOV of the 56mm a bit annoying, while the 40mm 65 degree AFOV is bigger but still small enough to take everything in in one go. An ultrawide 30mm is more immersive, but not as good for sweeping around - at an 80+ degree AFOV, I usually have to look around to take everything in. Very nice for viewing once you've found something, but the 40mm works better for hunting for things.
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    Default Re: Meade Super Plossl 56mm Question

    A 56mm eyepiece for an f/8 scope will give you a 7mm exit pupil. That's pushing the limit for many people, and might be wider than your dilated pupil.

    A 40mm 65-70° is a better bet at this f-ratio. Depending on your budget, there are many suitable choices in this realm. The 40mm Explore Scientific 68° would be a good one, as would a (much lighter!) 40mm Paragon or similar (40mm Titan II ED, 40mm Skywatcher Aero ED, etc.) Best image would come out of a 41mm Panoptic (very expensive) or 40mm Pentax XW (discontinued, and CRAZY expensive on the used markets). The 40ES-68 will be close to the 41-Pan for *substantially* less money, and the even cheaper 40mm Paragon and similar versions should work fine at that f-ratio.

    All should be noticeably better than the Q70's.

    Clear Skies,
    Phil
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    Default Re: Meade Super Plossl 56mm Question

    Generally speaking you want 4-6mm exit pupil for the lowest power EP (depending on light pollution levels), which would be 32 to 48mm for F8 scope.

    Good quality 56mm Plossl (Meade over Astromania) would provide sharp and flat views, but you will find background sky brighten with some loss of contrast. Still, it may have some uses for extra large low SB targets (comets, nebulae) in particular with filters.

    My favorite low power EP in refractors is Baader Aspheric 36mm 72deg

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