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Equipment Discussions >> Refractors

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JoseBorrero
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Reged: 09/04/09

Loc: Puerto Rico Island
Sky-Watcher 100mmED f/9 extra info
      #5846699 - 05/07/13 09:45 PM Attachment (67 downloads)

Here are some info I found useful about this refractor FPL-53 doublet. here my simple study. I'm using all are done with 2" baader filters. I have done similar test with the ED80T CF which is also FPL-53 and found all filters parfocal but I ned to repeat the test with evidence.

With the Sky-Watcher 100ED I found the Blue, H-Alpha and SII a bit off focus. My best solution if having installed an autofocuser with offset filters well done!


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JoseBorrero
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Reged: 09/04/09

Loc: Puerto Rico Island
Re: Sky-Watcher 100mmED f/9 extra info new [Re: JoseBorrero]
      #5846705 - 05/07/13 09:49 PM Attachment (52 downloads)

here's my sample of LRGB even without correcting for focus at least on the Blue channel.

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stevew
Now I've done it


Reged: 03/03/06

Loc: British Columbia Canada
Re: Sky-Watcher 100mmED f/9 extra info new [Re: JoseBorrero]
      #5846884 - 05/07/13 11:22 PM

Great shot Jose!

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leviathan
sage


Reged: 11/29/11

Loc: Azerbaijan
Re: Sky-Watcher 100mmED f/9 extra info new [Re: stevew]
      #5847137 - 05/08/13 04:29 AM

Nice, thank you ! I also bought used 100ED recently and this is very interesting info for me. Yes, blue seems to be a bit off focus.

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JoseBorrero
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Reged: 09/04/09

Loc: Puerto Rico Island
Re: Sky-Watcher 100mmED f/9 extra info new [Re: leviathan]
      #5847670 - 05/08/13 12:27 PM

By the way, I think is important to know , The Star used was Alkaid, is a blue B3V main sequence star. This spectral type indicates an effective temperature of 9100 K, a diameter twice that of the sun, and a luminosity 4300 times that of the sun, and a mass perhaps 13 times that of the sun.

I'm wondering if performing a similar test on a G2V star will change the game.


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JoseBorrero
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Reged: 09/04/09

Loc: Puerto Rico Island
Re: Sky-Watcher 100mmED f/9 extra info new [Re: JoseBorrero]
      #5849064 - 05/08/13 11:23 PM Attachment (26 downloads)

heres same application using Arcturus Star. A type K1.5 IIIpe orange giant star

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leviathan
sage


Reged: 11/29/11

Loc: Azerbaijan
Re: Sky-Watcher 100mmED f/9 extra info new [Re: JoseBorrero]
      #5849266 - 05/09/13 04:04 AM

Seem to be in focus for RGB this time, isn't it ? Only H-Alpha and SII seem to be a bit out.

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JoseBorrero
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Reged: 09/04/09

Loc: Puerto Rico Island
Re: Sky-Watcher 100mmED f/9 extra info new [Re: leviathan]
      #5850451 - 05/09/13 04:53 PM

you're right!

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