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Moonfish eyepieces

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#1 FJA

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Posted 30 October 2005 - 07:01 PM

I have seen a mini-review of the Moonfish (a brand I have never previously heard of) 30mm Ultrawide eyepiece in BBC Sky At Night Magazine. They give it an excellent review and it comes out on top of all the wide angle eyepieces they tested, including a 31mm Type 5 Nagler (although the Nagler lost points because of the enormous £500 price tag).
Does anyone have an experience with the Moonfish eyepieces? I need some new eyepieces and judging by the good review and the fact it only costs £59 I might be interested in acquiring one. :question:
Thanks.

#2 Spyke

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Posted 31 October 2005 - 02:37 AM

Mine should be here in a few days! :grin:

And check out this thread on 30mm, 80+ degree 2" ep alternatives

Enjoy :cool:

#3 Benjamin B

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Posted 31 October 2005 - 02:41 AM

I´m buying one in few days to my C11 OTA. I will let you know how it works.

#4 FJA

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Posted 31 October 2005 - 04:54 PM

Cheers Spyke and Benjamin. :)

#5 theoUK

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Posted 03 November 2005 - 03:49 PM

I have owned a 32mm 2" moonfish lens for several months. I like it very much and I've used it for photography and visual. I have noticed some coma though (more than my other eyeieces). In the image below of the Perseus double cluster you can see the coma clearly towards the edges, but this is my widest view ep and the coma could just be the fault of my primary.
http://homepage.ntlw...ersei small.jpg

#6 Spyke

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Posted 05 November 2005 - 08:27 AM

Ok, mine arrived today, and it is HUGE!
Nice coatings, and seems well made. Can't wait to try it out soon...
Here it is with a Meade 32mm Plossl for comparison.
Posted Image
:jump:

#7 Spyke

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Posted 05 November 2005 - 06:38 PM

I got a chance to get out with this tonight, and WOW was I impressed!:jawdrop:

I also have the GSO 42mm and GSO 30mm Superview 2" eyepieces. The 42mm has a field of 55 degrees, and the 30mm 65 I think. I like both and use them a lot in my f6 Dob and f7 TV85. I had calculated that the 30mm Moonfish would give the magnification of the 30SV and the True Field of the 42SV.

So I took all three out tonight with the 8" f6 Dob, and guess what- it was true! I compared the views of the Pleiades, M36, 37 and 38 in Auriga, and a couple of clusters that I hadn't viewed before and don't know the names of.

The eyepiece gave sharp views, and the edge correction was much better than I expected. It was way better than the 30mm Superview, with good starpoints out to about 85% of the field, as opposed to about 75% in the Superview. But of course the field is that much wider as well, so even better! The true field was indeed the same or slightly larger than in the 42mm Superview, and the higher magnification made the nebulosity in M45, or stars at the edge of clusters, stand out quite a bit more easily.

I really think it has made the 42mm Superview redundant. And probably my 30mm as well! At one point I nearly let go of the tube and just about fell headlong into the middle of the Pleiades! Spacewalk? You bet.:grin: :

#8 square_peg

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Posted 05 November 2005 - 09:32 PM

Thanks for the report! :bow:

I need to consider this EP for my F6 dob. Is is only available off ebay?

#9 Spyke

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Posted 06 November 2005 - 05:22 AM

No, you can get them directly from the Moonfish website:
Moonfish Group

They're very quick and helpful too. :)

#10 NJ Night Sky

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Posted 06 November 2005 - 08:48 AM

Congrats on the new eyepiece

#11 Guest_**DONOTDELETE**_*

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Posted 07 November 2005 - 08:50 AM

May I ask if anyone had tried their 1 1/4" series? They have some really wide (and cheap £39) eye pieces with FOV 70°.
The field stops are at 12.4 mm (10mm EP), 18.6mm (15mm EP) & 24.8 mm (25mm EP). I'm getting my first scope (after 2 years I have astronomy as hobby), a Skyliner 200 (8" Dob) and the eye pieces (along with filters) are my nightmare who will push my budget to the limits.

Thank toy.

#12 Michael Morris

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Posted 08 November 2005 - 06:35 PM

I have the 20mm and 15 mm widescans in the 1.25" and I am mightly impressed I posted a review of them a few months ago link. I hope this helps.

#13 square_peg

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Posted 08 November 2005 - 08:02 PM

Is the Moonfish 30mm UWA the same eyepiece that SmartAstronomy sells on ebay for $73?

#14 Spyke

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Posted 09 November 2005 - 02:29 PM

It looks identical, Tom, except the Moonfish has a built in M49 camera thread at the top of the barrel. :)

#15 Psa19one

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Posted 09 November 2005 - 08:52 PM

Hmmm... I wonder how this EP would compare with the 1rpd 30mm from Astrobuffet? (aside from the difference in AFOV)

#16 Spyke

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Posted 10 November 2005 - 07:44 AM

I thought the AFFOV of the 1rpd was also 80 degrees? Actually, the review in Sky at Night magazine stated that by measuring the field stop diameter, the AFOV was gauged to be slightly in excess of 80 degrees. The company website states a field stop diameter of 40.8mm but the reviewer meassured it to be 44.8mm! I haven't measured mine, and don't have calipers of any kind so probably won't.
I read somewhere that this eyepiece comes off the same assembly line as the 1rpd, but can't find it again just now...

#17 Psa19one

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Posted 10 November 2005 - 10:34 AM

Hmmm... You're right. I was thinking for some reason that my 1rpd was a 70 deg. AFOV. How interesting that so many EPs out there are essentially the same thing but with different brand named slapped on them.

#18 ric_capucho

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Posted 10 November 2005 - 11:43 AM

The Ultrawide 30mm come from the same assembly line as the 1rpd, and they are nominally 80 degrees afov. The Moonfish version has the M49 camera thread cut into the top, plus the rubber eyecup to collect the rain water we have to put up with here in Europe.

The 70 degree versus 80 degree confusion arises often: The 30mm Superview eyepiece (a completely different eyepiece entirely, from the GSO factory) is about 70 degrees afov, and tends to edge perform better at less than f/6. The 30mm Ultrawide is happier at f/6 and upwards. Both are quality/cost bargains of some repute, and we just happen to sell both under our own brand. But hold them in your hand, and there's no mistaking the difference; the Ultrawide is built like a tank, and you'd regret dropping it on your foot, while the Superview feels much more like a standard 2" eyepiece.

Hope that helps,

Ric Capucho
Moonfish Group

#19 Penarin

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Posted 10 November 2005 - 11:52 AM

Nice picture... wonder where they got the idea for the green text? Seems I've seen that somewhere else :)

Let us know how the EP works out for you.

#20 Spyke

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Posted 10 November 2005 - 12:18 PM

Since trying it in the Dob I've been grounded by bad weather. Can't wait to try it in the TV85 and ED100...

:p

#21 square_peg

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Posted 11 November 2005 - 12:53 AM

The 30mm Superview eyepiece (a completely different eyepiece entirely, from the GSO factory) is about 70 degrees afov, and tends to edge perform better at less than f/6. The 30mm Ultrawide is happier at f/6 and upwards. Both are quality/cost bargains of some repute, and we just happen to sell both under our own brand.


Thanks for chiming in, Ric. But just for clarification, when you say, "The 30mm Ultrawide is happier at f/6 and upwards", are you saying that the 30mm UWA is better or worse in fast (short focal length) scopes than the GSO Superviews?

#22 ric_capucho

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Posted 11 November 2005 - 01:51 AM

At under f/6 we recommend the 30mm Superview over the 30mm Ultrawide, as the edge performance of the Ultrawide drops off too much (in our opinion) as you go under f/6. No point in having 80 degrees of afov, if the outer 5 degrees of 'ring' is too soft; might as well go instead with a nice 70 degree afov eyepiece like the Superview.

Now here in Europe these things happen to be branded Moonfish, but our USA cousins can also learn a lot from what I said, as these GSO Superviews and 1rpd eyepieces are available over on your side of the Atlantic from a variety of sources. I'm not aware of any one source that sells both of these eyepieces over there, so I've never heard of the direct comparison being made before.

Ric Capucho
Moonfish Group

#23 rodrake

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Posted 11 November 2005 - 08:15 AM

That's good info Ric. I have the 30 Superview and have been considering replacing it with a 1rpd for use in my f6 mak-newt. I think I'll just stick with the Superview. By most accounts, the AFOV is closer to 65 deg which still gives me almost a 3 deg TFOV.


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