Cleaning a polarizer nightmare

Discussion in '35mm Cameras' started by Tom Miskiewicz, Feb 17, 2005.

  1. Hi!

    I have the nikon polarizer II. I was trying to clean it with water and
    soap, but every time some water drops and the water stain I can't get
    rid of are left. No matter how you touch it, you don't get it clean.
    Any advice appreciated!

    Tom
     
    Tom Miskiewicz, Feb 17, 2005
    #1
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  2. I suggest though rinsing with distilled water and drying with a clean
    cloth that has also had a final rinse in clean water (or a new clean lens
    tissue). Don't use a cloth that has been washed or dried with as fabric
    softener.

    I also suggest that you don't over do it. You can often see some
    apparent blemish on the surface, but it may well have no effect on the
    results.

    Take some photos and see if it is really making a difference or creating
    a problem. I see far too many situations where someone is worried about
    some theoretical problem that in real life is not a problem. According to
    theory the honey bee could not fly, but as long as it does not know that it
    flies just fine.
     
    Joseph Meehan, Feb 17, 2005
    #2
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  3. Tom Miskiewicz

    Owamanga Guest

    That's good advise. But in future, for quick mini-cleans just breath
    on the filter. If your breath disappears without identifying any
    smudges, leave it alone. If it does need a clean, another breath and
    quick rub with lens tissue should do the trick.
    Even if the smudge/blemish doesn't affect the image, it's still
    annoying. I don't know why, but it is.
    It can't actually fly, it just sort of levitates in a vibratory way.

    ;-)

    Compared to traditional flight, there isn't much research into
    vibratory levitation, so nobody has bothered to mathematically prove
    that's how it moves. I wanted to do this study at uni for a Phd, but
    they were more interested in whether pigeons are left or right footed
    (that's not a joke, BTW).

    As soon as it's wings stop flapping, it plummets. In my book,
    plummeting is a good indication of not being able to fly.
     
    Owamanga, Feb 17, 2005
    #3
  4. Tom Miskiewicz

    Alan Browne Guest

    You meant bumblebee. According to theory, they fly as expected. The problem
    was people using the wrong theories. (L=Cl V^2 S rho/2 is just too limited for
    bumblebees and hummingbirds. Cl for an insect varies in a complex cycle and
    that cycle cycles at 50 - 500 times sec, V too).

    As to glass, a film of crap on the filter will increase susceptibilty to flare.
    As a polarizer is best used in light falling 90° wrt the optical axis, the
    risk of flare is moderete to high (esp. w/o a hood)... so clean glass is a good
    goal. I agree that the odd fleck of dust is not that important.

    For day to day (not that often really) use, a microfibre cloth is great. Just
    don't get the black one, it's too hard to judge if it's dirty. The amber/yellow
    one is best, IMO. They can be washed.

    100% Cotton shirts are great too, but tend to leave lint. Better to use a black
    shirt in this case as black lint won't do anything to the image.

    I use Kodak Lens Cleaning Fluid in very sparing amounts with Kodak lens papers.
    One 16 oz bottle is a lifetime++ supply.

    Cheers,
    Alan
     
    Alan Browne, Feb 17, 2005
    #4
  5. Tom Miskiewicz

    Peter Chant Guest

    So what is your stance on helicopters?
     
    Peter Chant, Feb 17, 2005
    #5
  6. Tom Miskiewicz

    Owamanga Guest

    If my piloting experience in MS Flight Sim 2004 is anything to go by,
    these are risky at best.

    Anyway, who makes flapping helicopters?
     
    Owamanga, Feb 17, 2005
    #6
  7. Tom Miskiewicz

    Alan Browne Guest

    Thou shalt maintain thy rotor RPM lest the earth rise up and smite thee.

    It's something like this: On engine failure (and ignoring all the ancillary
    details), lower the collective w/o over spinning the rotor, maintain airspeed
    (70 kts or so / cyclic)) approach a decent landing spot, reduce speed (nose up)
    and maintain rotor rpm as high as possible as it bleeds off. Keep drawing on
    collective to reduce vertical speed as you land. (It's not nearly as easy as I
    describe it, on the other hand an experienced helo pilot will do it without any
    great effort... in daytime anyway).

    I've done (as a pax) this in a Bell-205 (UH-1D ish), and I've seen a Bell-204
    (UH-1B ish) do an autorotate, land, take off again (10 feet), pedal turn 360,
    and land again. All on rotor inertia.

    Cheers,
    Alan
     
    Alan Browne, Feb 17, 2005
    #7
  8. Tom Miskiewicz

    Alan Browne Guest

    Piece of cake. See my other post. For my sims (Janes) I have rudder pedals and
    a good flight stick. Looking for a good collective for realistic purposes.

    Cheers,
    Alan
     
    Alan Browne, Feb 17, 2005
    #8
  9. Tom Miskiewicz

    Owamanga Guest

    This is way off topic now, but anyway.

    My anti-torque control is a twist on a cheap Force feedback joystick
    that soon becomes uncomfortable (needs to be held in position). Relax
    for a few seconds and the heli turns to crap in no time. :) The
    grand canyon may be wide, but not *that* wide. Collective and cyclic
    are Y & X joystick motion, throttle is a rotary throttle

    Rudder pedals? Hmm, I think the wife would leave me, might help save
    my wrist. So right now, I prefer planes.

    Anyway, switch to FS2004 dude! Some of the photo realistic scenery
    and meshes available from ahem, a.b.w.flightsim, or reputable dealers
    is amazing. Not to mention the HUGE quantity of freeware aircraft out
    there. Easily 300+ Helos and 2000+ Aircraft.

    For example, have you taken the new Airbus A380 out for a spin yet?

    These sites require to register, but I think both but certainly avsim
    don't require you to pay.

    http://www.surclaro.com
    http://library.avsim.net

    Since NASA completed their 3D radar scan of the planet a couple of
    years ago, the data became public domain and can be imported into
    FS2004 as decent resolution meshes. Mix that with satellite or aerial
    imagery and you've got yourself a decent 3D world to explore.

    And here is some in-game screenshots of what photo realistic scenery
    looks like in FS2004 (Spain):
    http://www.fsplanet.com/mainstore6.htm

    Or if you are familiar with the UK:
    http://www.visualflight.net/photoscenery/screenshots.htm

    And if you live in the US, an accurate road addon helps VFR:
    http://www.flightsim.com/cgi/kds?$=main/review/usard/usard.htm

    Even with all this stuff loaded, frame rates from a P4 are usually
    above 40fps. (Flying a formation of Blue Angels, Snow Birds or Red
    Arrows can be a bit taxing though)

    ...and with a decent subwoofer attached to the PC, nothing beats the
    sound of the old British Nuke carrier, the Vulcan Bomber doing it's
    stuff in Argentina (also a bitch to fly, mind you) .. or the whine of
    the A-10 Warthog as it skims the mountains of Afghanistan.

    Does Jane's let you do sky-writing (obviously not in a helo) ? You can
    in FS2004.

    ...all good fun.
     
    Owamanga, Feb 17, 2005
    #9
  10. Tom Miskiewicz

    \Lou\ Guest

    Alan, I'm not trying to be a smart ass but I don't believe it can be
    done. I've done literally 100's of power-off autorotations in UH-1A's, B's,
    D's & H's and after the initial touchdown there is not enough rotor RPM to
    even think about trying to lift off again. Just my experience as an
    "old(and I mean real old) but not bold" Army instructor pilot. "LOU"
     
    \Lou\, Feb 17, 2005
    #10
  11. Tom Miskiewicz

    Paul Bielec Guest

    How about Battlefield Vietnam...of course it is a FPS, not a simulator.
    But all you need is a mouse and a loud set of speakers...
    Just to cool to fly around discharging a chain gun with the '70 music
    playing in the cabin. Just plain sick fun!!!
     
    Paul Bielec, Feb 17, 2005
    #11
  12. Tom Miskiewicz

    Peter Chant Guest

    You don't go by the 'they are so ugly the earth repels them' theory then?

    :)
     
    Peter Chant, Feb 17, 2005
    #12
  13. Tom Miskiewicz

    Peter Chant Guest

    I remember a real one at several air shows when I was small. I suspect that
    you need more than a decent sub woofer. It also seemed to make a really
    loud shreik as it went overhead. The favourite trick seemed to be a low
    slow low pass followed by a steep climbing turn to put the audiece in as
    much of the sound footprint for as long as possible.
     
    Peter Chant, Feb 17, 2005
    #13
  14. Tom Miskiewicz

    jimkramer Guest

    jimkramer, Feb 18, 2005
    #14
  15. Tom Miskiewicz

    Ken Tough Guest

    And not just that, but the dynamics of the wings were poorly
    understood. They're not foil-shaped, but neither are they just
    flat planes. A ridge on the upper leading edge creates turbulence
    which has a similar effect to bernoulli, exploited recently in
    some frisbee-like rings which also have ridges on their leading
    edges.
     
    Ken Tough, Feb 18, 2005
    #15
  16. Tom Miskiewicz

    Owamanga Guest

    Awesome game, just like it's predecessor. FS2004, BF-1942 & BF-Vietnam
    are really the only games I can't stop diving into for the last couple
    of years. Yes, Vietnam has the edge over 1942 because the music is
    better and you get the Hueys (or something like them) and Chinooks.

    Truly, Jefferson Airplane is a requirement for any military action.

    Not to forget that snipering in Germany & or hammering a Pacific
    Island from a warship is still good clean fun. The desert tank fights
    are always an hour well spent too.

    The one thing missing from FS2004 is guns & missiles, but that's what
    MS Combat Flight Sim is for, not that I've ever played it.
     
    Owamanga, Feb 18, 2005
    #16
  17. Tom Miskiewicz

    Owamanga Guest

    The only thing that sounds remotely like it is a Concorde doing a
    similar maneuver, and no aircraft can incite fear like the shape of
    the Vulcan's delta-wing climbing out of a valley to pass overhead. I'm
    certain that's why the Brits used them to bomb Argentineans in the
    Falklands in '82. Fear factor.

    After that was a period where they didn't fly any more. Last time I
    saw one flying was around 1985 at Biggin Hill, SE England. Today it
    probably costs about $60,000 to fill her up.

    Good news, the Brit Government are spending lottery money to bring one
    back to life, sadly only showing it within the UK:
    http://www.oliverhealdmp.com/pr 060104.htm

    For interested simmers, (who are reading off-topic posts in a photo
    group), here is the bird:
    http://www.flightcraft-simulations.co.uk/vulcan.html

    The cockpit shot shows how damn small the windows are, which makes
    landing a tricky thing if you can't remember the keystrokes needed to
    raise your seat. There is also a freeware model around somewhere.
     
    Owamanga, Feb 18, 2005
    #17
  18. Tom Miskiewicz

    Alan Browne Guest

    In most helos you have to hold the rudder pressure at all times. (The first
    time I was given the stick on a B-412 I got it stable I wanted to say something
    to my engineer in the back [testing a radar]. I wasn't sure about the PTT
    switch on the cyclic so I removed my foot to press the PTT 'mushroom' switch on
    the floor. The helicopter gyrated wildly. Then I was told about the 'half
    PTT' on the cyclic for intercom. blush.) On the black hawk (UH-60) there is
    'hold' device built into the pedals so once the anti torque is set (in constant
    regime) you can put your feet down. A good way reduce fatique.
    I don't get too excites with airline sims (except for IFR trainers).
    Wonderful stuff.
    Other Janes Sims include F-22, F-15, JSF, etc. etc. Janes Sims no longer
    exists, so I'm stuck with several that don't work under XP. These sims are 'so'
    realistic that they are really not for the faint of heart. Take months to master.

    I don't do the sims so much for the visuals (I have an IFR trainer that has no
    visuals, just the panel and a tiny 200x150 window for "outside" so you can call
    the lights on an approach) but for the operations, missions, tactics, etc.

    Cheers,
    Alan
     
    Alan Browne, Feb 18, 2005
    #18
  19. Tom Miskiewicz

    Alan Browne Guest

    Seen it done. At Mascouche, QC airport where I used to be a flight instructor
    (fixed wing) during a local air show. Lightly loaded to be sure. I have no
    idea if he over cranked the rpm during the auto-r and then did the 2nd rot on
    badly decayed rpm but what I saw was what I saw. I can't attest to his boldness
    or whether he is still in the business.

    Cheers,
    Alan.
     
    Alan Browne, Feb 18, 2005
    #19
  20. Tom Miskiewicz

    Alan Browne Guest

    That would almost be better than accepting the facts: Bell once attached a
    movie camera to the rotor hub (very close to center) looking down the length of
    a blade (I believe it was a UH-1). So in flight you would see the blade (twist,
    bend, etc.) and the background just a grey blur.

    The range of twisting and bending motion was as 'violent' as that film of the
    famous bridge in the northwest in the 30's or 40's gyrating and twisting in the
    wind. Except here it was in small fractions of a second... scary.

    Cheers,
    Alan
     
    Alan Browne, Feb 18, 2005
    #20
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