Results 1 to 6 of 6
  1. #1
    S. Caro's Avatar
    S. Caro Guest

    Default Solar filter for 400mm digital camera lens?




    I've got a quality 400mm f5/6 lens for my digital camera. It
    takes great shots of the moon and shows lots of sharp crater detail.

    With sunspot cycle 24 finally beginning, I'm interested in
    photographing sunspots. (I know a dedicated solar telescope
    would be the best bet, but the cost of them is greater than my
    interest in solar photography :-)

    I bought a square of #12 welder's shade. It works, but the optics
    are terrible through the thick glass. I can't get a sharp picture
    of the sun through it. (But I can just make out current sunspot 1034).

    I've browsed the net for 'solar filters' and see there are several
    available in my budget range ($70- $100).

    Can someone suggest a good solar filter big enough to cover a camera
    lens with a 77mm (~3 inch) front element? (One that they've had
    reasonable success with)?

    Thanks in advance......



  2. #2
    Chris L Peterson's Avatar
    Chris L Peterson Guest

    Default Solar filter for 400mm digital camera lens?

    On Wed, 16 Dec 2009 13:43:06 -0600, "S. Caro" <scaro@muxnet.com> wrote:


    I'd suggest you buy some Baader film, and make a simple plastic or
    cardboard holder for it. Since you're using a standard camera lens, you
    could get a lens cap and cut a hole in it. You won't find any filters
    that give better optical performance than the Baader film, although you
    can easily spend a lot more to get equal or worse results.
    _________________________________________________

    Chris L Peterson
    Cloudbait Observatory
    http://www.cloudbait.com

  3. #3
    Howard Lester's Avatar
    Howard Lester Guest

    Default Solar filter for 400mm digital camera lens?

    "S. Caro" wrote


    And you can buy Baader solar filter material Chris refers to at

    http://www.astro-physics.com/

    Click on Products (left pane)
    Scroll down to Accessories
    Under Accessories find Baader Planetarium accessories

    They sell only by the sheet. They're large enough to make enough material to
    make filters for yourself and all your friends. You can choose between
    visual and photographic densities.

    An alternative, if it's still available, is a 4" square Kodak Neutral
    Density filter, density #5 (I believe).



  4. #4
    S. Caro's Avatar
    S. Caro Guest

    Default Solar filter for 400mm digital camera lens?

    Howard Lester wrote:


    Thanks Chris and Howard :-)

    I'll give that a try.



  5. #5
    Dan Birchall's Avatar
    Dan Birchall Guest

    Default Solar filter for 400mm digital camera lens?

    I've just ordered a pair of 58mm black polymer threaded filters
    (item 58T) from Thousand Oaks Optical, who are a pretty big name in
    the staring-at-the-sun department. They offer a bunch of different
    materials, but due to the optical complexity of a camera lens, they
    don't recommend glass filters for solar use, only the black polymer.

    I haven't shot through it yet, though (the only solar stuff I've done
    was a partial eclipse through a piece of mylar lent by Steve O'Meara)
    so I can't really recommend it on the basis of sucessful use.

    I'm hoping to shoot the January 15th eclipse with it, and will try to
    remember to post my thoughts afterward.

    -D

    --
    djb@ | Dan Birchall, Night Operation Assistant, Subaru Telescope/NAOJ.
    naoj | Views I express are my own, certainly not those of my employer.
    ..org | Why do phasers have fewer settings than Kitchenaid bowl mixers?

  6. #6
    Anthony Ayiomamitis's Avatar
    Anthony Ayiomamitis Guest

    Default Solar filter for 400mm digital camera lens?

    On 16 ─ňŕ, 21:43, "S. Caro" <sc...@muxnet.com> wrote:

    The best solution out there is Baader's ND5 filter. It is also
    available as ND3.8 but it lets in more light and is strictly for
    imaging purposes. In contrast, the ND5 material can be used for both
    imaging and observation.

    All of my work involving the sun's photosphere is done exclusively
    using Baader's filter and which I highly recommend. Here are some
    examples thanks to its exceptional quality:

    (1) http://www.perseus.gr/Astro-Solar-Su...2005-07-05.htm
    (2) http://www.perseus.gr/Astro-Solar-Su...2007-06-03.htm
    (3) http://www.perseus.gr/Astro-Eclipses-2005-10-03.htm
    (4) http://www.perseus.gr/Astro-Eclipses-2008-08-01d.htm

    Anthony.

 

 

Similar Threads

  1. Digital compact camera - low light, low weight, and threaded lens
    By James Harris in forum CCD Imaging Forum
    Replies: 1
    Last Post: 09-21-2008, 04:56 AM
  2. Digital compact camera - low light, low weight, and threaded lens
    By James Harris in forum Amateur Astronomy Forum
    Replies: 1
    Last Post: 09-21-2008, 04:56 AM
  3. Digital compact camera - low light, low weight, and threaded lens
    By James Harris in forum UK Astronomy Forum
    Replies: 1
    Last Post: 09-21-2008, 04:56 AM
  4. Replies: 1
    Last Post: 09-20-2008, 06:22 PM
  5. Mounting 1.25" eyepiece filter on camera lens
    By brianc1959@aol.com in forum Amateur Astronomy Forum
    Replies: 2
    Last Post: 09-18-2006, 10:46 PM

Tags for this Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
Powered by vBulletin« Version 4.2.0
Powered by vBulletin«
All times are GMT. The time now is 02:31 PM.