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The Baader 3 for Chromatic Aberration or CA

Discussion in 'Eyepieces, Barlows, and Filters' started by Dave In Vermont, May 28, 2018.

The Baader 3 for Chromatic Aberration or CA

Started by Dave In Vermont on May 28, 2018 at 3:46 PM

90 Replies 9056 Views 1 Likes

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  1. Dave In Vermont

    Dave In Vermont Well-Known Member

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    Dave In Vermont, May 29, 2018
    #21
    That's why I always advocate 'freeware' to people out there in web-ville. As soon as someone makes a version of a popular software-program and charges money for it, watch out! It's destined to crash, delete your files, or simply not really do what it claims it does.

    The freeware has no profit attached to it, and all the advertising you will ever hear about it are from actual users. Once you remove money from the equation, all that's left is the truth.
     
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  2. Nebula

    Nebula Well-Known Member

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    Nebula, May 29, 2018
    #22
    Once you remove money from the equation, all that's left is the truth.

    That is so so true. i am keeping this for my signature.
     
  3. Dave In Vermont

    Dave In Vermont Well-Known Member

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    Dave In Vermont, May 29, 2018
    #23
    You can use it. It's mine, but I'll be happy to share that! LOL!
     
  4. Gabby76

    Gabby76 Well-Known Member

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    Gabby76, May 30, 2018
    #24
    Here are 4 images from Wolfgang Rohr website using the various Baader filters to demonstrate the different blocking effects.
    They show the subtle effects from each filter blocking specific wavelengths.
     
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  5. Mak the Night

    Mak the Night Well-Known Member

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    Mak the Night, May 30, 2018
    #25
    That's interesting Gabby. I often find it difficult to distinguish between a TS Optics (GSO) #8 and the Fringe Killer on my ST80. The FK can be more subtle, but often, and bizarrely, I find I prefer the #8. I've got a Lumicon #8 on order, so I'll be testing that next.
     
  6. Dave In Vermont

    Dave In Vermont Well-Known Member

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    Dave In Vermont, May 30, 2018
    #26
    Good find Gabby. Thanks for posting this!
     
  7. Gabby76

    Gabby76 Well-Known Member

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    Gabby76, May 30, 2018
    #27
    Unfortunate that there is no one perfect tunable filter!
    The differences in contrast/ detail can be quite subtle and also quite different between observers.
    You can see in the images how each filter deals with high contrast detail with different backgrounds.
     
  8. Dave In Vermont

    Dave In Vermont Well-Known Member

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    Dave In Vermont, May 30, 2018
    #28
    A good choice of backgrounds in the montage by Mr. Rohr in all of these certainly helped!

    Very cool - they're going into my tool-kit too.
     
  9. Mak the Night

    Mak the Night Well-Known Member

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    Mak the Night, May 30, 2018
    #29
    What I find odd is that I don't find the Semi-Apo nearly as natural as Baader seem to. I'm not the only person to say this either.
     
  10. Gabby76

    Gabby76 Well-Known Member

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    Gabby76, May 30, 2018
    #30
    Out of the 4 filters I kept the Contrast Booster, M&S and Fringe-Killer. I actually did not like the view with the Semi-Apo and found that combining the Fringe and M&S made a more natural toned view.
     
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  11. Mak the Night

    Mak the Night Well-Known Member

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    Mak the Night, May 30, 2018
    #31
    This is what most people find I think. I always assumed it was aperture related, when I get to test my ST102 properly I'll have to try the Semi-Apo.
     
  12. Dave In Vermont

    Dave In Vermont Well-Known Member

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    Dave In Vermont, May 30, 2018
    #32
    My violet-laser agrees. But I have them all. I am a 'Nut.'

    I just zapped my William Optics VR-1 with the laser. It took out about 90% of the beam.
     
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  13. Gabby76

    Gabby76 Well-Known Member

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    Gabby76, May 30, 2018
    #33
    There is a "rough" cut off for using light and dark filters, usually between 150mm - 200mm depending on the darkness of the skies.
    The smaller the aperture the lighter the filter so as not to dim the view to much.[/QUOTE]
     
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  14. Gabby76

    Gabby76 Well-Known Member

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    Gabby76, May 30, 2018
    #34
    Dave do you know what wavelength your laser operates at?
     
  15. Dave In Vermont

    Dave In Vermont Well-Known Member

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    Dave In Vermont, May 30, 2018
    #35
    I've wondered that. But I presume it's the same as other violet (or blue) lasers. They're rather specific at 473nm for the solid-state diode variety - like my pointer.

    If you want one - be very careful! Most are from China and put out a nasty 50mW. - which can cause serious eye-damage.

    https://en.wikipedia.org/wiki/Blue_laser
     
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  16. Gabby76

    Gabby76 Well-Known Member

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    Gabby76, May 30, 2018
    #36
    What make is it Dave?
    I have a 532 green laser that is illegal in North America due to its operating power. :)

    I was just curious to check it against some of the published filter curves.
     
  17. Dave In Vermont

    Dave In Vermont Well-Known Member

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    Dave In Vermont, May 30, 2018
    #37
    It doesn't come with a make. It's Chinese is all I know. It cost about $14US in one of my catalogs. A toilet-side reader. :p

    Operates on 2 AAA-batteries. All it has is a 'DANGER' sticker like most laser-pointers.
     
  18. Mak the Night

    Mak the Night Well-Known Member

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    Mak the Night, May 30, 2018
    #38
    Is it like this?

    d21fc799-bc8d-4d16-b4fc-3e900c0a72ae.png
     
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  19. Dave In Vermont

    Dave In Vermont Well-Known Member

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    Dave In Vermont, May 30, 2018
    #39
    No. Those are on back-order from one of Stephen Hawkings buddies' from the future who came back here in time for his funeral.
     
  20. Gabby76

    Gabby76 Well-Known Member

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    Gabby76, May 30, 2018
    #40
    Mine uses a 18630 li-ion battery and has a range of 34142 meters. :)
    You do NOT want to test optics with it! lol
     
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