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Old 30-11-2018, 10:02 PM
ausastronomer (John Bambury)
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HOYA 2" (48mm) 85B Colour Filter (Visual Planetary)

I have for Sale a brand new 2" (48mm) HOYA 85B Colour Filter. I have had this filter for about 15 or 16 years but somehow I ended up with 2 x 85B so this one has never been out of the case before tonight's photographs.

This will screw straight onto any 2" threaded eyepiece or accessory like a barlow, paracorr or a threaded diagonal etc. I actually fit mine to the bottom of the Feathertouch Focuser drawtube via a 52mm to 48mm stepdown ring.

This is one of the older Japanese made Hoya colour filters and is of far superior quality to the cheaper Chinese/Taiwanese colour filters.

It is one of the most useful of all the colour filters for visual planetary observing. It is an Orange filter similar to the Wratten #21 but a little bit darker. It is used to enhance the following planetary features:-

Mars - Lightens reddish areas and accentuates dark surface markings; helps to penetrate the Martian atmosphere.

Jupiter - Helpful for accentuating the cloud bands.

Saturn - Helpful for accentuating the cloud bands.

Mercury - Helps to highlight the planets phases.

Because it is a bit darker than the #21, I would recommend using it in Telescopes over 4" aperture only. Smaller telescopes would be better with the #21.

I am asking $20 for this plus $5 postage.

Cheers
John B
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Last edited by ausastronomer; 01-12-2018 at 07:56 AM.
  #2  
Old 01-12-2018, 05:38 AM
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area51 (Anthony)
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Re filter

Message sent, cheers
  #3  
Old 01-12-2018, 07:57 AM
ausastronomer (John Bambury)
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Quote:
Originally Posted by area51 View Post
Message sent, cheers
Thanks Anthony PM Sent
 

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