Jump to content

  •  

CNers have asked about a donation box for Cloudy Nights over the years, so here you go. Donation is not required by any means, so please enjoy your stay.

Photo

Review: The Vixen FL55ss

  • Please log in to reply
6 replies to this topic

#1 Hesiod

Hesiod

    Gemini

  • *****
  • topic starter
  • Posts: 3204
  • Joined: 13 Jan 2013

Posted 08 September 2019 - 11:32 AM

Overall judge the FL55ss a good product. As a wide field astrograph is very proficient and easy to use, so would suggest it wholeheartedly, even to beginners (usually at this stages apreture does not matter, while the clever Vixen mini-refractor is very user-friendly and, at 300mm, gives a more forgiving sampling than the popular 60-80mm rebranded models).

Click here to view the article
  • paulsky, zjc26138 and dUbeni like this

#2 Organic Astrochemist

Organic Astrochemist

    Viking 1

  • *****
  • Posts: 886
  • Joined: 10 Jan 2015

Posted 13 September 2019 - 09:06 PM

Great review. I do think these small refractors can be a lot of fun.
 
Another application for these small telescopes is spectroscopy!

I am sure your Vixen FL55ss would work as well as my Borg 55FL. This is not a great image of open cluster NGC 6231, but the Wolf-Rayet star (HD 152270 = WR 79) sticks out (the lines to the right are the spectra)

NGC 6231 annotated
Here is the annotated spectrum, clearly showing features of a WC Wolf-Rayet star.
HR 6265 WC7
By contrast, here is a WN Wolf-Rayet star, WR 136, HD 192163
WR 136 HD 192163
Here's a spectrum of planetary nebula NGC 6886, that is a mere speck even in much larger apertures, but reveals some details in its spectrum.
NGC 6886

 

Thank you for promoting these wonderful small telescopes.


  • zjc26138 likes this

#3 RichA

RichA

    Apollo

  • *****
  • Posts: 1050
  • Joined: 03 Jun 2010
  • Loc: Toronto, Canada

Posted 15 September 2019 - 10:10 PM

Good review!  I wonder though if anyone has compared these small, fast refractors against normal camera lenses?



#4 MortonH

MortonH

    Viking 1

  • -----
  • Posts: 915
  • Joined: 12 May 2007
  • Loc: Sydney, Australia

Posted 16 September 2019 - 04:34 AM

Where are the pictures of the scope???



#5 Hesiod

Hesiod

    Gemini

  • *****
  • topic starter
  • Posts: 3204
  • Joined: 13 Jan 2013

Posted 16 September 2019 - 04:41 AM

@Organic Astrochemist
Very interesting! Which kind if equipment do you use?

@RichA
I use also a Canon ef200 f/2.8: the FL55ss is noticeably better even at f/4 (less CA, tighter stars, less coma).
The lens however is smaller, lighter (but the refractor+reducer is smaller than a 200 and a 300mm lens) and much faster.
I focus manually, sometimes with the help of a mask, and feel easier to do so with the refractor.
The lens is obviously more handy for daytime photography

#6 calypsob

calypsob

    Aurora

  • *****
  • Posts: 4690
  • Joined: 20 Apr 2013

Posted 24 September 2019 - 08:25 PM

the star tests I have seen on a full frame via astrobin yield un impressive stars at the edges, I have no way of knowing if this was because of spacing. Have you tested with ff?



#7 Hesiod

Hesiod

    Gemini

  • *****
  • topic starter
  • Posts: 3204
  • Joined: 13 Jan 2013

Posted 25 September 2019 - 11:10 AM

No, I have only an aps-c sized camera.

On Vixen's website there are the spot diagrams for flattener and reducer+flattener, with flats and a picture taken with a Canon camera (https://www.vixen.co...roduct/37253_9/ ).

With a FF there could be the need of some work on star shapes at the edges

I also contacted them through the site asking about spacing because am still pondering my next camera (FF DSLR or cooled ccd), and a couple of days later they answered me sending a diagram from which I understood that the sensor has to be 63,5mm behind the reducer, and that the adapter I have offsets that distance for Canon's cameras.




CNers have asked about a donation box for Cloudy Nights over the years, so here you go. Donation is not required by any means, so please enjoy your stay.


Recent Topics






Cloudy Nights LLC
Cloudy Nights Sponsor: Astronomics