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  1. #51

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    Quote Originally Posted by Lee L View Post
    The OM-1 was the only Olympus OM model with mirror lock up, which combined with its size and weight made it sought after among astrophotographers.

    Leica R6/R6.2 have mirror lock up. If you flick the top of the shutter release on a Leica SL with a finger tip, it will lock up the mirror without firing. Not sure if this works on the SL2. I can make it work consistently on an SL.

    Lee
    This works on many Pentax SLRs as well. I use it Spotmatics and various M-series. Don't think I ever tried it on my K1000, which I wish I had never sold... sigh.
    -brian hayden
    http://fed-2.org

  2. #52
    rhmimac's Avatar
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    Re: Does "no mirror" really = sharper negs?

    Thank you for the list.
    The thread started in the RF forum which I forgot.
    I will reignite it on the proper place

    rhmimac
    Give me some more E6 film…

    please...

  3. #53

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    Performing the laser pointer test seems like it would not be anything more than a curiosity unless the laser spot was actually photographed.
    2F/2F

    "Truth and love are my law and worship. Form and conscience are my manifestation and guide. Nature and peace are my shelter and companions. Order is my attitude. Beauty and perfection are my attack."

    - Rob Tyner (1944 - 1991)

  4. #54
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    And, as has already been pointed out, it's stupid to photograph the laser point, and one might as well photograph a resolution chart. If the laser is attached to the camera solidly, it's going to move in exactly the same way the camera is, and so it will be no surprise that the laser point stays a nice sharp dot, even as the rest of the photograph becomes blurred by mirror slap. Trying to acertain mirror slap by photographing a laser point from a laser attached to the camera is about as perfectly flawed a test as one could imagine. Lasers don't actually draw streaks on walls....they just look like they do.
    f/22 and be there.

  5. #55

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    Quote Originally Posted by BetterSense View Post
    And, as has already been pointed out, it's stupid to photograph the laser point, and one might as well photograph a resolution chart. If the laser is attached to the camera solidly, it's going to move in exactly the same way the camera is, and so it will be no surprise that the laser point stays a nice sharp dot, even as the rest of the photograph becomes blurred by mirror slap. Trying to acertain mirror slap by photographing a laser point from a laser attached to the camera is about as perfectly flawed a test as one could imagine. Lasers don't actually draw streaks on walls....they just look like they do.
    Isn't the point to see if the dot is blurred during the exposure?
    But, as yet I haven't photographed a dot. Laser or otherwise.
    Expletive Deleted!

  6. #56
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    I'm saying, that if the laser is attached to the camera, the dot is never going to be blurred, regardless of how shaky the camera is. If the camera moves, the dot will also move. Think about it. You need to photograph something that's external to the camera if you want to see if the camera is shaking.
    f/22 and be there.

  7. #57

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    Better Sense is correct. The dot should be photographed, but not attached to the camera to tell you anything useful. At that point, you could just photograph anything for the test to work.
    2F/2F

    "Truth and love are my law and worship. Form and conscience are my manifestation and guide. Nature and peace are my shelter and companions. Order is my attitude. Beauty and perfection are my attack."

    - Rob Tyner (1944 - 1991)

  8. #58
    David A. Goldfarb's Avatar
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    And if you look closely at the projected dot from a typical laser pointer, it's not really a great resolution target. From the distance of the audience at some dreadful PowerPoint presentation, it seems well defined, but up close, it's a bit like a mark from a thick crayon. I'd think that even a page of newsprint would be more informative.
    flickr--http://www.flickr.com/photos/davidagoldfarb/
    Photography (not as up to date as the flickr site)--http://www.davidagoldfarb.com/photo
    Academic (Slavic and Comparative Literature)--http://www.davidagoldfarb.com

  9. #59

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    Quote Originally Posted by David A. Goldfarb View Post
    I'd think that even a page of newsprint would be more informative.
    Exactly what I almost suggested in my last post.
    2F/2F

    "Truth and love are my law and worship. Form and conscience are my manifestation and guide. Nature and peace are my shelter and companions. Order is my attitude. Beauty and perfection are my attack."

    - Rob Tyner (1944 - 1991)

  10. #60
    rhmimac's Avatar
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    Re: Does "no mirror" really = sharper negs?

    I found a very nice graph showing the vibration amplitude set out to the shutter & mirror opening subs. Closing action

    See:http://photo.net/learn/nature/mlu

    Makes me thinking of buying an F4 for my macrowork on a 105mm

    rhmimac
    Give me some more E6 film…

    please...



 

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