PI Photography

Exercises in Extreme Focal Lengths
Sony Mavica FD-92 and Leica Televid 77

    This series of photos were taken with a Sony Mavica FD-92, 1.3 megapixel resolution, and an 8x zoom lens. The overall focal length range of this camera is from 41mm to 328mm. The true 'normal' focal length for a 35mm is actually 42.7mm, so this lens gives us the closest view to what 'normal' is supposed to be in the 35mm world most are familiar with.
    The Mavica is the largest of the cameras that are suitable for this kind of use, in my opinion. Most have a 37mm front filter size which fits just inside the eyepiece ring on the Leica - others may or may not work as well. The problem with this setup is that I'll need to make a mount for the camera and a support for the camera. But the flexibility of the Mavica series is great. This camera still has the floppy disc drive and also has a Memory Stick. You can copy between them, and make a full disc copy as well. It does use a very good quality video lens so the images are also pretty good - especially at the ranges the setup is capable of.
    I did not keep good records of which photo was what equipment - the obvious are obvious - but the remainder are a bit confusing given the built-in zoom capabilities of the camera itself.
    Once the Leica was added the photo differences are apparent. The shortest zoom setting on the Leica is a 20x.
    The results of this test are so interesting that I am going to re-do this experiment and keep a much better record of what I did. There will be more shots too.
    * Remember - these shots are  all  h a n d h e l d !


    Just outside my door. The Honda is near 100 yds - kinda close as you will see.
    This photo is at the shortest focal length this camera offers, 41mm equiv ( 1x for here )


    Just a little more zoom.


    Progressing to a little more zoom.


    More zoom yet.


    I think I am near maximum camera zoom here.


    You can see there is little difference in this shot to the one above. I was just at the end of the zoom range on the camera.


    Now I know this one is with the scope in place.
    Notice the black in the corners - the camera lens is set to too wide a zoom setting and vignetting is occuring.
    The vignetting will not keep you from using the shot as long as the image inside is what you want. Just know what it is and are able to explain it.


    Just beginning to show some real magnification now.


    Now we're talking zoom range. If any of you are familiar with the size of this little sticker - it is less than 2" wide!
    Remember this is handheld and I have not moved closer to the vehicle.


    The exact shot from above using one little trick that might help reveal information that is blurry in some photos.
    This shot is 'reversed' ( like a negative would be ) and keeps the color information in the photo.


    Again the exact same shot, reversed - but with the color information discarded - making it a 'grayscale' image. Only do this on copies of any photo you attempt this with.


    Getting a sense of what this can do yet? I have not moved, and the shot is still handheld.
    Since I did not keep good records on this test I am not sure - but I think this is at maximum zoom on both the camera ( 328mm ) and on the spotting scope ( 60x ). This gives a 35mm equivalent focal length of … 19,680mm! Try this with any 35mm camera. To get to 300mm to 400mm is going to cost ya $1000 for a decent lens.


    The above reversed and without color information. And you can still read the numbers - think of this at full screen. 8x camera, 60x scope.

480x = 19,680mm !

    Nineteen thousand, six-hundred eighty millimeters of zoom! And I still have one more surprise I think - I'm checking on it.
    Planning another test or two, rounding up the scopes now - let's see when I can get them done.

    With this capability, I am gonna have to recruit a friend to drive about a mile away for a good test. Puttin' them little FRS radios to good use. Great fun - and think of those remote surveillances.

Copyright  ©  2005  ·  Barry A. Kintner  ·  Arizona Investigators Association  ·  A2Z Computer Works - Phoenix, Arizona