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

William optics Flattner 68lll or Flattner 0.72 reducer

  • Please log in to reply
2 replies to this topic

#1 Sweep

Sweep

    Lift Off

  • -----
  • topic starter
  • Posts: 4
  • Joined: 20 Dec 2018

Posted 16 February 2019 - 04:40 AM

Hi

 

Which flattner is best for a flt132 with a full frame cmos color camera.

Preference is to image deep sky nebula, star clusters etc

 

Thanks



#2 scadvice

scadvice

    Viking 1

  • *****
  • Vendors
  • Posts: 736
  • Joined: 20 Feb 2018
  • Loc: Lodi, California

Posted 16 February 2019 - 04:50 AM

Try this site...it should give your answers. 

 

https://astronomy.to.../field_of_view/



#3 sg6

sg6

    Aurora

  • *****
  • Posts: 4608
  • Joined: 14 Feb 2010
  • Loc: Norfolk, UK.

Posted 16 February 2019 - 07:37 AM

Presently WO seem to be recommending the 0.72 FR option:

This revolutionary new WO x0.72 Reducer flattener it’s Adjustable was made for 6 -7.8 F ratio refractors.

This high-quality flattener has been engineered and CNC machined for usage with our GT153 ,FLT 132, 102GTS and other APO refractors.

This accessory is a must-have for refractor astrophotography.

Lens

• ED Triplet APO Designed to cover full size DSLR cameras with clear lens aperture of 50 mm

• STM coated with an excellent doublet air spaced design.

• Produced entirely with the best Ohara optical glasses.

• Flattener Power: x0.72

• 45mm for full illuminated imaging circle.
 

I think Full Frame is just over 43mm, but needs to be checked.

 

The 68III seems to be a flattener only, but otherwise has much the same said about it:

This revolutionary new WO FF68III Adjustable Flattener was made for 6 -7.5 F ratio refractors.

This high-quality flattener has been engineered and CNC machined for usage with our FLT 132, 102GTS and other APO refractors.

This accessory is a must-have for refractor astrophotography.

Lens
• Designed to cover full size DSLR cameras with clear lens aperture of 50 mm
• STM coated with an excellent doublet air spaced design.
• Produced entirely with the best Ohara optical glasses.
• Flattener Power: 1x (no reduction).
• 45mm for full illuminated imaging circle.

 

Both claim they are for the FLT 132. Seems to come down to: Do you want to reduce or not?

 

One or another are adjustable, makes changing distance easier. Almost seems that someone at WO has realised a threaded section and a locking ring are a useful combination.

 

WO site says the FR 0.72 is out of stock: WO FR's




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