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Firefly 85mm telescope

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#1 wiseone

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Posted 22 June 2012 - 10:33 AM

The 'Firefly85' telescope is now available! It is the lightest 85mm apochromatic telescope in the world at a mere 29 oz. (810g), thanks to the carbon fibre body and advanced optical system. Full details are on our web site: www.firefly85.com
Because of the light nights in the UK, astro photos will have to wait until late July.

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#2 wiseone

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Posted 24 June 2012 - 11:45 AM

Image taken through the telescope using a hand-held compact camera; the caravan site is about 4 miles distant. Quite a lot of heat haze, but you can see the lack of chromatic aberration and flat field. I hope to get some lunar images in the next few days - assuming that the skies are clear. A rarity in this neck of the woods!

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#3 Crayfordjon

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Posted 24 June 2012 - 12:51 PM

That is fantastic for such a lightweight telescope, amazing.I had no part in the development of this scope.

#4 wiseone

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Posted 25 June 2012 - 04:15 AM

Up at 7:00am today and got some better terrestrial images, sharp to the edge - some ca due to atmospheric refraction and turbulence. Cloudy last night, so no Moon images.

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#5 Tapio

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Posted 25 June 2012 - 04:38 AM

What's the focal length ?

#6 wiseone

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Posted 25 June 2012 - 04:59 AM

Hi there. Focal length is 480mm, and the 2 images shown here are taken with a 3x zoom on the camera.

#7 Tapio

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Posted 25 June 2012 - 07:38 AM

Why do you call it "apochromatic telescope" when it is in fact , if I understand it correct, a mirror scope ?

#8 wiseone

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Posted 25 June 2012 - 07:47 AM

Hi Tapio, the mirrors have nothing to do with the optical design. It is not a catadioptric - it is pure refractor. All the mirrors do is to fold the light path to make it more compact. It works perfectly well without these flat mirrors, but is then a lot longer.

#9 wiseone

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Posted 25 June 2012 - 07:52 AM

I forgot to add that the term 'apochromatic' has nothing to do with the actual design. Any telescope that has a Strehl ratio of greater than 0.94 can be termed 'apochromatic'. There are many other ways of deciding whether a telescope is apochromatic or not, but I won't go into that. The major thing is that there is no detectable chromatic aberration across the field of view, and after all, it is optical performance that matters, not numbers. I hope that this helps.

#10 wiseone

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Posted 26 June 2012 - 02:53 AM

Moon image, taken while Sun low down. Moon about 25 degrees high, and considerable turbulence. Hope to get better soon.

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#11 Wes James

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Posted 26 June 2012 - 07:28 AM

Very nicely executed folded refractor!!

#12 wiseone

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Posted 26 June 2012 - 08:30 AM

Thanks for your kind comment Wes. The work is not even half done, however. Marketing it is the hardest job.
It would be nice if we had a rich uncle!!!

#13 Wes James

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Posted 26 June 2012 - 09:26 AM

I had a rich uncle once.... didn't do me any good....

#14 Crayfordjon

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Posted 26 June 2012 - 10:02 AM

I had a rich uncle he did me hellava lot of good. :D :D :D

#15 Crayfordjon

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Posted 26 June 2012 - 10:10 AM

Did a bit of fiddling with the magic electic box.

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#16 Crayfordjon

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Posted 26 June 2012 - 10:11 AM

also

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#17 wiseone

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Posted 26 June 2012 - 10:29 AM

I had a rich uncle 25 years ago, and when he died, all I got was a pair of his shoes. Hahahaha!

#18 Crayfordjon

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Posted 29 June 2012 - 09:56 AM

Moon at near 1st quarter, this is not a greyscale image, the Firefly is a winner!!.

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#19 Mark9473

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Posted 29 June 2012 - 11:27 AM

What are we supposed to see on those lunar images other than fuzzy detail and a ring of colour at the edge?

#20 wiseone

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Posted 29 June 2012 - 03:04 PM

The image is the best I could get by hand-holding a compact camera against the eyepiece and taking single shots. By stacking a multitude of images and Registax processing, there would be a much better image. The small amount of colour is due to atmospheric refraction - the Moon was very low down at the time.

#21 Houdini

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Posted 29 June 2012 - 05:48 PM

You're not doing yourself any favors by publishing hand-held single shots to illustrate the quality of a $1000+ scope.

#22 Crayfordjon

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Posted 30 June 2012 - 02:42 AM

I am afraid that a lot of people go under the illusion that an Apochromat is completly colourless, not so, only a reflector holds that distinction, even then there is some colour intoduced by the eyepiece. An
apo corrects the secondary CA in an ordinary achromat, leaving tertiary CA, this is so small that it usually is unoticeable, but it is there, to cure this with more lenses up front only produces exponential returns, and you can keep this up forever. Sometimes this tertiary colour shows up as avery faint fringe but you have to seriously look for it.

#23 Mark9473

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Posted 30 June 2012 - 09:09 AM

I don't mind a bit of colour as long as the image is crisp not this fuzzy stuff you're showing. It might very well be an excellent scope but you're not showing off its qualities here.

#24 Crayfordjon

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Posted 01 July 2012 - 02:05 AM

Fuzzy eh, Hummmm! perhaps an appointment with the optician is in order mate! :smirk: :smirk:

#25 wiseone

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Posted 02 July 2012 - 04:20 AM

Until the end of July 2012, we are able to offer our Firefly 85 telescope at a price of US$950, plus $50 delivery to non-business customers in the USA.
Stocks are limited, so hurry to catch this wonderful offer!






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