Canon high-end telephoto lens - advice please

Discussion in 'Canon' started by Victor Meldrew, May 16, 2005.

  1. Hi,

    Please forgive my intrusion. I'm not a regular here but thought you may
    be able to advise me.

    I have recently bought a 400mm F4 DO IS lens for wildlife photography. I
    am absolutely delighted with the results I have had so far (but am still
    smarting from the hole in my bank balance!). However, not being used to
    this calibre of equipment, I was most surprised to find that there was
    no thread to take a protective skylight/UV lens. Obviously the huge hood
    does a good job of protecting the lens but there is still going to be
    the need to clean it every so often (in fact I have already done so with
    blower brush, lens tissue and my heart in my mouth!)

    Am I missing a trick here, is there something really obvious I have
    overlooked? Given that I probably will need to clean the lens surface,
    what do you guys reckon is the safest way? Are those lens pens the way
    to go, or do they leave something on the surface that may interfere with
    light transmission over time?



    Use Reply-to address for e-mail reply.

    Because of incessant spammage this address will only be valid for a few days.
    Victor Meldrew, May 16, 2005
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  2. Are you sure that it doesn't unscrew at the front of the lens? I don't own
    this particular lens, but in the ones I do own that incorporate a protective
    hood, it can be unscrewed front the front of the lens......
    William Graham, May 16, 2005
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  3. Victor Meldrew

    Tony Polson Guest

    Victor Meldrew?


    Tony Polson, May 16, 2005
  4. Victor Meldrew

    deloid Guest

    Nice lens! The filter size is 52mm and located between the tripod mount and
    camera body. There is a pull-out in that region. Hope this helps keep "both
    feet out of the grave"!
    deloid, May 16, 2005
  5. Victor Meldrew

    Paul Rubin Guest

    Don't clean it unless it gets really filthy. If it just gets dust on
    it, use an air blower but don't use lens tissue or anything that touches
    like that. You can have a huge amount of dust on the front element
    without affecting the image except to lessen contrast by a tiny amount.
    Paul Rubin, May 16, 2005
  6. Victor Meldrew

    Roxy d'Urban Guest

    You're the first person I have ever heard of who bought that lens.

    None of the big telephotos will take screw in filters. If they did be
    prepared for a shock at the cost of them - and also why spend that much on
    a lens and then slap a nasty piece of glass in front of it?

    Have the lens insured and stay away from lens pens. They suck.
    Roxy d'Urban, May 16, 2005
  7. Sorry, seem to be confusing people here. Yes the hood comes off the lens
    easily and I can see where the 'creative' filters are fitted. My
    question was around fitting a protective filter (sorry I said "lens"
    didn't I - doh!) at the front of the lens. But given that I can't see a
    thread to fit one, maybe I have to actually clean the lens surface
    itself, in which case which is the safest method?


    Victor Meldrew

    Use Reply-to address for e-mail reply.

    Because of incessant spammage this address will only be valid for a few days.
    Victor Meldrew, May 16, 2005
  8. Victor Meldrew

    Paul Rubin Guest

    DO NOT CLEAN THE LENS SURFACE unless you absolutely have to. Don't
    obsess about keeping dust off the lens. Use the lens cap to keep
    fingerprints off of it. Let it get a lot dirtier than really looks
    good, before you think about cleaning it. If necessary, blow dust off
    with a squeeze bulb. If there's some kind of accident that makes you
    need to clean it, use the usual microfiber cloth and lens cleaning

    Lots of amateurs clean their lenses all the time. Cleaning (putting
    anything in contact with the lens coating) is bad for lenses and
    should only be done as a last resort. It is worse for the lenses and
    the images, than just leaving the lens dirty.

    If you look at a big astronomical telescope (like in an observatory,
    not what an amateur would use) there's often tons of dust and gunk on
    the mirror and they don't clean it. It doesn't affect the images at
    all. On the other hand, a figure error of 1/8th of a wavelength can
    completely mess up the image (the Hubble Space Telescope needed a
    corrective lens because of something like that). Paradox of optics.
    Paul Rubin, May 16, 2005
  9. Oh.....I use a good quality artists brush.....Very fine hairs....Sable, if
    you can afford it. And a rubber air bulb. I generate a lot of dust, and
    these two always have worked for me....However, if you get something greasy
    on the surface, you might need a fluid...I would buy something especially
    made for the purpose from a photography store. Strange chemicals might
    destroy the coatings they put on the lens surface for anti-glare purposes.
    William Graham, May 16, 2005
  10. Victor Meldrew

    Sander Vesik Guest

    Even if there was a thread, where would you get a 100mm+ filter from?
    Sander Vesik, May 17, 2005
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