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Zerochromat II

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#1 wiseone

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Posted 18 November 2013 - 05:51 AM

We are now able to offer our apochromatic Zerochromat II 8 inch dialyte refractor OTA at a price of just US$5000!
The design is a singlet f19 plano convex objective lens followed by a series of small corrector lenses to remove aberrations. The path length is folded by two flat mirrors, high reflectivity coated for maximum light transmission. All other air-to-glass surfaces are broadband coated in the visible range.
The specifications are:
Objective diameter 203mm (8 inches)
Focal length 2400mm (f11.8)
Tube diameter 288mm
Tube length 1550mm
Tube is carbon fibre, painted a durable white colour, with gloss black end caps.
OTA weight 10kg
Field of view 0.8 degrees
Strehl ratio 0.97
Supplied with Moonlite 2 inch focuser and 8 x 50 right-angle finderscope.
Web site: www.firefly85.com

These instruments are hand made to order, and delivery is normally 8 to 10 weeks after receiving a 50% deposit.
Here is a view of the finished instrument.

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#2 wiseone

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Posted 18 November 2013 - 05:53 AM

And another view, this time from the front.

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#3 steveastrouk

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Posted 18 November 2013 - 06:13 AM

Is that the instrument in " 8" Zerochromat: Went, Witnessed, Want One! ", in the refractor thread ? I tried to comment in it, but its locked.

http://www.cloudynig...6163471/page...

#4 wiseone

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Posted 18 November 2013 - 06:42 AM

Hi Steve, that was a very lively thread, but it has been locked.

#5 Lightning

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Posted 18 November 2013 - 07:01 AM

10 kgs?! That is truly remarkable. I want one too but I don't see it happening sadly. Still, I'm sure those fortunately enough to get one will be very, very happy.

Cheers,
Cam

#6 steveastrouk

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Posted 18 November 2013 - 07:18 AM

10 kgs?! That is truly remarkable.

He he, that's what I was trying to post too !

#7 wiseone

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Posted 18 November 2013 - 08:37 AM

The weight of 10 kg is genuine, and it sits quite happily on an EQ6 or similar mount.

Collimation is very easy indeed, as the small mirror is fixed, and the large fold flat is adjustable while observing through the instrument. I have travelled about all over, and the collimation does not move.

#8 Crayfordjon

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Posted 18 November 2013 - 11:12 AM

For those who are interested, the Zero is a retrofocally corrected dialyte similar to a Schupmann, but unlike the Schup' it has all refractng optics behind the prime focus, and is a true refractor, whereas the Schup' is a catadiopric system. The diagram shews the research system from which Peter developed a whole new series of improved Apochromatic systems uniquely his own.

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#9 SteveG

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Posted 19 November 2013 - 01:38 PM

Spec's converted:

Tube Dia = 11.3"
Tube Length = 61"
Weight = 22 lbs

#10 wiseone

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Posted 25 November 2013 - 08:27 AM

Please find attached spot sizes of a typical air-spaced 8 inch f12 achromat refractor compared with an 8 inch Zerochromat refractor.
The results speak for themselves.

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#11 wiseone

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Posted 25 November 2013 - 08:42 AM

Can't seem to post multiple images, so I will post them individually.

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#12 wiseone

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Posted 25 November 2013 - 08:43 AM

8 inch achromat 0.3 degrees off-axis

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#13 wiseone

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Posted 25 November 2013 - 08:44 AM

8 inch Zerochromat on-axis

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#14 wiseone

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Posted 25 November 2013 - 08:46 AM

Finally, 8 inch Zerochromat 0.3 degrees off-axis.

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#15 wiseone

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Posted 04 December 2013 - 12:01 PM

We can now supply parts for a DIY version of the Zerochromat 8 inch f12 refractor. Please go to the ATM forum for more details, or you can visit our web site (www.firefly85.com)

#16 wiseone

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Posted 15 December 2013 - 05:23 AM

There is now much more detail on the web site (www.firefly85.com) for anyone wanting to either purchase a complete instrument, or make one themselves.

#17 wiseone

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Posted 02 January 2014 - 08:48 AM

New Year very special offer! We have only 1 demo unit left at US$3200, plus US$250 delivery to the US. We have already sold our other demo unit. Delivery will be 6 to 8 weeks after payment, as it will be brought up to as new condition.






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