Minolta UV Filter - multicoated?

Discussion in 'Minolta' started by Siddhartha Jain, May 16, 2005.

  1. I recently bought a Minolta 35-70mm f/3.5-4.5 lens. Alongwith the lens,
    I got a Minolta UV filter. Now, I mostly keep a UV filter on all my
    lenses but a good quality one like B+W or Hoya SMC. How do I tell if
    this Minolta filter is any good? I bought the 35-70mm given its good
    optical performance (as rated by photodo) and its light-weight so I
    don't want to put some crappy piece of glass in front of it.

    - Siddhartha
     
    Siddhartha Jain, May 16, 2005
    #1
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  2. I suggest this. Take a series of photo pairs (with and without the
    filter), at least some under conditions that would produce flare, some close
    up and some at full wide angle. Compare the results.

    I am a firm believer that your results using your equipment under your
    typical conditions and settings are 98% more meaningful than any test done
    by someone else or anyone else's experience.
     
    Joseph Meehan, May 16, 2005
    #2
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  3. Thanks. The idea did not occur to me because I thought the Maxxum 5 is
    a film camera so it would be cumbersome and expensive doing photo
    pairs. The only other lens that will take this filter is a Pentax 50mm
    lens with a 49mm filter ring and it fits my Canon 300D with an
    M42-to-EOS adapter. What I am getting to is that would testing the
    filter on a prime bring out all its flaws vs testing the filter on a
    zoom?

    - Siddhartha
     
    Siddhartha Jain, May 16, 2005
    #3
  4. Siddhartha Jain

    Alan Browne Guest

    I have Minolta UV filters on two of my lenses. From results, they are
    are no different than my B+W filters. I have no idea where Minolta get
    these filters or if they make them themselves.

    The only time to be very concerned with filters is with light hitting
    the front of the lens directly, including strongly backlit subjects. In
    that case, flare being innevitable regardless of filter used, remove the
    filters altogether.

    In short, there are 99 other things you can do to improve your photos
    before you worry about UV filters causing any loss of image quality.

    Cheers,
    Alan
     
    Alan Browne, May 16, 2005
    #4
  5. Siddhartha Jain

    RichA Guest

    Hold the filter up in front of you and tilt it back and forth.
    Does the image shift? If yes, then it's not plane parallel
    (both sides parallel to each other) and it may have magnification
    due to lack of flatness.
    Hold the filter at an angle and allow a light bulb to reflect off
    it towards you. Does the image of the light seem bright? If so,
    it could indicate poor quality coatings. The best coatings send
    back very little light (0.5%) from a reflection. No coatings send
    back 4% per surface, old style magnesium fluoride single-layer
    coatings reflect about 1.5% at each surface.
    -Rich
     
    RichA, May 16, 2005
    #5
  6. There are a few factors that are lens specific, so I suggest checking it
    on the lens(s) you plan to use it with.
     
    Joseph Meehan, May 16, 2005
    #6
  7. Siddhartha Jain

    Colyn© Guest

    I own several Minolta brand filters and find them to be as good as the
    above mentioned filters.
    Minolta glass is far from being "crappy"
     
    Colyn©, May 16, 2005
    #7
  8. Siddhartha Jain

    RichA Guest

    Here's a trick you can do; Take two B&W filters, remove them from
    their cells, make sure there is no dust, and put them together.
    Do the same with two Minolta (presuming they actually make their own).
    Examine them both under fluorescent lights or illuminate them with
    a one-colour LED source. You'll see alternating bands of light and
    dark. The B&Ws will appear straighter and there will be fewer of
    them. This is because those bands are interference fringes and they
    indicate the flatness of the glass. If the bands
    looks like a contour map of the Andes, your filters are DOGS!

    -Rich
     
    RichA, May 17, 2005
    #8
  9. Siddhartha Jain

    Bandicoot Guest

    B+W or Hoya SMC. How do I tell if this Minolta > >filter is any good? I
    bought the 35-70mm given its good
    0.5% is probably a good average for current multi-coating, but "the best" do
    rather better than that. With Pentax's SMC reflection is down to about
    0.2%.
    And with complex modern multi-element designs (esp. zooms) that difference
    adds up fast, since it happens at every air-glass surface - ie. twice per
    lens/cemented group. Without multi-coating a lot of today's lens designs
    just wouldn't be realistic possibilities.



    Peter
     
    Bandicoot, May 17, 2005
    #9
  10. Thanks for all the replies, guys. I think I have enough info to check
    the filters. Will post the results.

    - Siddhartha
     
    Siddhartha Jain, May 18, 2005
    #10
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