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Skywatcher ED ... 72!

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Old Saturday 14th July 2018, 02:33   #1
Cosme
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Skywatcher ED ... 72!

Haven’t see any thread of this astro

Is the small brother of the well knowed, very well rated ED 80

It’s only 8 mm less but also 700 grams lighter ... can be lighter with an helical focuser instead the crayford ... I would say it can stay in 1.5 kilos ... (2kgs original ota) and 420 fl

I googled the whole scope name + digiscoping and there’s no images yet ... not even astro!

Hope somebody discover the Sw 70 ed by me, it was released not much ago. Tempting price ... 350€|$

Regards!

Last edited by Cosme : Saturday 14th July 2018 at 02:35.
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Old Sunday 19th August 2018, 15:00   #2
ricky25
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No stock in UK

Hi, I was also looking at this scope, it's been out of stock in the uk for some time, there's a good unboxing video on on youtube with follow up, I asked him about how close it could focus, he kindly replied, 8m with the eyepiece he tried.

Try this link for stargazerlounge

https://www.google.com/search?q=Skyw...hl=en&safe=off
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Old Thursday 20th September 2018, 14:19   #3
wachipilotes
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But its a FPL-53 lens?
Regards,
Wachi
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Old Thursday 20th September 2018, 14:41   #4
jring
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Originally Posted by wachipilotes View Post
But its a FPL-53 lens?
no, as with all new released scopes, Skywatcher elected not to disclose what ED glass is being used.

Joachim
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Old Thursday 20th September 2018, 15:14   #5
Binastro
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In the October 2018 Sky at Night magazine there is an interesting test of the Skywatcher 150ED DS Pro refractor.
The tester notes that on planets the contrast and definition were less good compared to the Skywatcher 150ED Esprit (triplet objective?).

Zeta Herculis an unequal close double star was split at 533x, (90x per inch of aperture) with the small companion residing in the first diffraction ring.

So, I was rather surprised the 150 ED doublet didn't do better on planets.
Maybe not the best ED glass?
Tube 9.5kg.
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Old Thursday 20th September 2018, 15:20   #6
PYRTLE
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Originally Posted by Cosme View Post
Havent see any thread of this astro
Is the small brother of the well knowed, very well rated ED 80

Regards!
Probably because this is designed more for astronomy rather than birdwatching.
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Old Friday 21st September 2018, 09:40   #7
jring
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Originally Posted by Binastro View Post
In the October 2018 Sky at Night magazine there is an interesting test of the Skywatcher 150ED DS Pro refractor.
The tester notes that on planets the contrast and definition were less good compared to the Skywatcher 150ED Esprit (triplet objective?).

Zeta Herculis an unequal close double star was split at 533x, (90x per inch of aperture) with the small companion residing in the first diffraction ring.

So, I was rather surprised the 150 ED doublet didn't do better on planets.
Maybe not the best ED glass?
Tube 9.5kg.
Hi,

yes, the Esprit series are all triplets with an FPL53 element. Regarding what glass it is - we don't really know - there's quite a few around but they are basically two groups which most of them fall into:

FPL51 and "copies": FPL51, FK52, NPK-52, FCD-1, H-FK61, FK1 and maybe some more...

FPL53 and competition: FPL53, its successor FPL55, N-FK56 and FCD-100.

Then there is OK4 which is kind of in between but this only available to LZOS and sometimes to some other russian lensmakers and of course Fluorite crystal, which is quite close to the FPL-53 group.

I suspect that the SW 150ED uses FPL51 or equivalent together with some lanthanum glass.

Joachim
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