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Thread: Budget ~30mm 70 degree eyepiece for 8in f5.9 dob

  1. #1
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    Default Budget ~30mm 70 degree eyepiece for 8in f5.9 dob



    I am after a 30-32mm ~70 degree 2 inch eyepiece for use in a 8in dob 1200mm focal length (f5.9).
    It will be used mainly as a finder piece and viewing some larger DSO.

    I do not have a massive budget so I am considering the.
    30mm - GSO superview- $89 AUD
    32mm - SWA 70 bosma (orion/agena/etc clone) $99 AUD
    32mm Skywatcher 70 deg long eye relief on sale for $169 AUD

    The skywatcher price is reduced a lot and seems a good deal, but the reviews online are not very favourable and say it performs similar to cheaper eyepieces (the 22mm is reported to be much better) and this is really more than I want to spend.

    I know the performance from these pieces will not be perfect in my scope but that is ok with me as I can not afford the more expensive eyepieces.

    Does anyone have any of these pieces and a similar scope?

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    Default Re: Budget ~30mm 70 degree eyepiece for 8in f5.9 dob

    I'd go for the GSO. At f5.9 it's likely better than the SWA. It's cheaper than the Skywatcher too and at 30mm how much do you want to pay for long eye relief.

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    Default Re: Budget ~30mm 70 degree eyepiece for 8in f5.9 dob

    Quote Originally Posted by not_Fritz_Argelander View Post
    I'd go for the GSO. At f5.9 it's likely better than the SWA. It's cheaper than the Skywatcher too and at 30mm how much do you want to pay for long eye relief.
    I totally agree. The GSO will perform much better in the scope than either of the others AND it's cheaper.

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    Default Re: Budget ~30mm 70 degree eyepiece for 8in f5.9 dob

    Get the explore scientific 68 degree 24mm. Stars will be pinpoint to the edge. There is a Bresser 60 degree 26mm that APM is selling on eBay about 100 dollars shipped to usa that has stars in focus all the way across. A cheap wide angle will not have stars in focus at the edges.
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    Default Re: Budget ~30mm 70 degree eyepiece for 8in f5.9 dob

    Unfortunately the ES 68-degree 1 1/4" eyepieces are nearly $A300, and the 2" ones (like the 28mm) are nearly $A400 locally...

    The GSO should perform quite well, but I suspect it will closer to 60 degree AFOV (I have the 42mm, and it is around 57-degrees measured, not 68!).

    I see the Prostar 32mm is on special at MyAstroShop for $69 (one only) at the moment: https://www.myastroshop.com.au/produ...p?id=MAS-004S2 - it is supposedly the same as the Williams Swan series, although the fact that they are recommending it for Mak and SCT scopes would indicate it is not great at f6.

    All the best,

    Dean

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    Default Re: Budget ~30mm 70 degree eyepiece for 8in f5.9 dob

    Quote Originally Posted by DeanD View Post
    Unfortunately the ES 68-degree 1 1/4" eyepieces are nearly $A300, and the 2" ones (like the 28mm) are nearly $A400 locally...
    For similar reasons I refrained from mentioning Panoptics

    The GSO should perform quite well, but I suspect it will closer to 60 degree AFOV (I have the 42mm, and it is around 57-degrees measured, not 68!).
    I disagree, in part. The 42mm definitely is short of 68 degrees AFOV. It has a field stop! The only way a 42mm fl eyepiece can get 68 AFOV is with a 2" field stop (like with the Pan 42). The GSO 30mm field stop is nearly as big as GSO 42mm field stop. So it's AFOV is much larger. I put it at 68 degrees.

    At f7 the GSOs have decent edge sharpness.

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    Default Re: Budget ~30mm 70 degree eyepiece for 8in f5.9 dob

    Thanks not_Fritz. I haven't measured the 30mm Superview, but I have the 42mm, and got an AFOV of close to 57-degrees. See: Are GSO Eyepieces FOV Bogus? (note that its "field stop" is effectively the retaining ring of the inner glass, and is inside the focal point, so the eyepiece has an indistinct edge-of-field. Presumably the 30mm doesn't suffer from this problem.

    - Dean

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    Default Re: Budget ~30mm 70 degree eyepiece for 8in f5.9 dob

    Kris Nilsen , when I first started out with Astronomy, the President of my club ( ASSA ) said to me your first eyepiece should be a GSO Superview. So true, great little eyepieces for the money. Bintel sell them.
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    Default Re: Budget ~30mm 70 degree eyepiece for 8in f5.9 dob

    Quote Originally Posted by DeanD View Post
    Thanks not_Fritz. I haven't measured the 30mm Superview, but I have the 42mm, and got an AFOV of close to 57-degrees. See: Are GSO Eyepieces FOV Bogus? (note that its "field stop" is effectively the retaining ring of the inner glass, and is inside the focal point, so the eyepiece has an indistinct edge-of-field. Presumably the 30mm doesn't suffer from this problem.

    - Dean
    No, it doesn't. Although I should add that the 30mm field stop also shares retaining ring functions.
    Last edited by not_Fritz_Argelander; 11-03-2018 at 08:06 AM.
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    Default Re: Budget ~30mm 70 degree eyepiece for 8in f5.9 dob

    Thanks for the help.

    Quote Originally Posted by tomjones View Post
    I see the Prostar 32mm is on special at MyAstroShop for $69 (one only) at the moment: https://www.myastroshop.com.au/produ...p?id=MAS-004S2 - it is supposedly the same as the Williams Swan series, although the fact that they are recommending it for Mak and SCT scopes would indicate it is not great at f6.
    Strange that the William Opticas SWAN is 33mm and 72 degree AFOV.
    I just looked up some reports and the SWAN is 33mm does ok at f6. 75% of FOV sharp and the rest not too bad (https://www.cloudynights.com/documents/swan.pdf)

    The 32mm 70 degree AFOV matches the orion/agena/bosma/etc clones.

    Anyway I am leaning towards the GSO at the moment.

 

 
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