Re: New article: guillotine shutters
It seems the idea of a simple shutter got lost along the way, though I did appreciate the ingenuity.
As for the matter of being committed to horizontal exposures as mentioned on page 1, simply calibrate for a vertical exposure, and when you rotate the back subtract 1/4 for a 4:5 proportion, or 1/3 for a 2:3. If you have to rotate the camera, same calculations, just mount the shutter to allow rotating it 90 degrees.
Re: New article: guillotine shutters
I really should have taken the time to compliment Bill Kumpf on the article. I use my oscilloscope to calibrate as well. The entire article was thorough and very professional. I hope to post soon on a simple rotating shutter design.
If you believe you can you do it, you can!
Re: New article: guillotine shutters
Quote:
Originally Posted by
chaspics
. . . I hope to post soon on a simple rotating shutter design.
If you believe you can you do it, you can!
The Guillotine shutter is simple, fairly compact, and reliable when properly constructed. A simple rotary shutter may be bulky and more prone to vibration, but can be extremely consistent and accurate. A good example is the 35mm Mercury and Mercury II cameras made between the late 1930s and about 1950. Seventy-five years ago Harvard University tested several shutters for use in a solar coronagraph. The Mercury shutter was chosen for its accuracy and reliability over Leica, Contax, and Argus. The Mercury had an error of 5% at 1/1000 second. The others gave exhibited errors of about 50% at their top speeds. The Mercury shutter was still performing accurately after 112,000 cycles in intense heat and sub-zero temperatures.
Re: New article: guillotine shutters
in need a very sinple design that operates with just a push, can be spring loaded but i need a shutter that opens and closes quickly (or a design so I can make it myself). The iris shutter on a camera is too complicated for my project but it would be ideal if i could get a simpler version. I just want to know some resources/suppliers names or alternative ideas to the camera shutter. Thanks for any help.
New article: guillotine shutters
Re: New article: guillotine shutters
nice work .... could you do the calculation if we consider a SLOT , with variable width, somehow like the focal shutter found in SLR ... ??
Thanks !!!
Re: New article: guillotine shutters
thanks .... very instructive ..................
Re: New article: guillotine shutters
Re: New article: guillotine shutters
Quote:
Originally Posted by
Alex95
Here we go again
:) It's like a dog chasing its own tail, isn't it? :)
Re: New article: guillotine shutters
Could somebody please help me with the math? I have some parts in the post were the numbers just don't add up. Could somebody tell me what is the 'Tt' here: "The trailing edge drop distance, Dt =((g* Tt^2 ) / 2) Dt =3.5245" as I cannot find it in the article.
Thanks so much