Topic: The "F" Word

[gerhed]

The lens is attached to the camera which is attached to the dowel and they all turn together
around the central cylinder with the shutter locked on the "B" setting.
It is possible to stop briefly after a 360 to re-orient the camera,
but then you've got to shoot another fairly soon or the string will fall off the cylinder.
After 6 360's the film should be back in the cassette.
I adapted several  electric motors to the
camera--one turned it at one r.p.m. and it worked well for interiors.
Another was a 12 volt d.c. motor that I used to take pictures from the roof of my car.
I went nuts with this thing for quite a number of years. Hundreds of shots !

[Bob Wessner]

Phil,

If the film speed is a constant and the slit dimension is a constant, is the EV determined by the rotational speed?

[gerhed]

Phil,

If the film speed is a constant and the slit dimension is a constant, is the EV determined by the rotational speed?

When turning by hand there's really only one successfull rotational speed so exposure changes would require a different film speed.
With the one rpm motor--100 speed worked fine for most interiors.
Standard was a bright sunny day -- 100 spd film and f16 plus about 1/16 th of an inch slit--slit could be on a lens hood.

[Bob Wessner]

Thanks Phil, somehow I was assuming the lens was wide open, though I guess even that would be a variable depending on the lens.

[francisew]

That's absolutely fantastic.

How did you figure out the exposure time for it? How long do you expose for, and how long does the rotation take?

I would have thought you'd need to pivot around the center of the lens to get a clean image...

I thought you were doing something like the digital cameras that stitch frames together, but this is much more impressive...

Francis

[gerhed]

That's absolutely fantastic.

How did you figure out the exposure time for it? How long do you expose for, and how long does the rotation take?

I would have thought you'd need to pivot around the center of the lens to get a clean image...

I thought you were doing something like the digital cameras that stitch frames together, but this is much more impressive...

Francis

Among panoramic purists there is the thinking that a pan camera has to pivot around the "nodal point"
of the lens in order to get proper alignment and/or perspective--this point being somewhere along the length of the lens.
I believe I have successfully disproved that theory.
No stitching here, man--Please !
Exposure time when turned by hand is a couple seconds, but effective exposure because of the
slit is about 1/125 th,
All of this was figured out by endless testing and film wasting.
Another important factor is obsession.
If you're not obsessed, a project like this won't be successfull.
Of course there's a price to be paid for obsession.
Another story !

[Chris Schneiter]

I just have one word: Circuit Pinhole!
As I said before, Man! I wish you lived in Michigan! We would have a great time! You're a little older than me (I'm 52) but you could mentor me! You'ld get along with one of my partners too...he rides a Shadow...we do a lot of the kind of thing that you do, only neither of us has shot film in years...here's an FTP of some of our stuff...http://www.greenfrogphoto.com/070321csvrflashsampless/  ...look at the Flash folder. It's an object VR we did for Motorola a while back...we shot it and it was put together in Flash...We had to retouch our "object stand" (a piece of armature wire) out of over 100 exposures!..we had a really limited time to do it, so we built our own object rig...no time to order one! It too looked a little "Rube Golbergish" too, but you do what you have to do!

[gerhed]

I just have one word: Circuit Pinhole!
As I said before, Man! I wish you lived in Michigan! We would have a great time! You're a little older than me (I'm 52) but you could mentor me! You'ld get along with one of my partners too...he rides a Shadow...we do a lot of the kind of thing that you do, only neither of us has shot film in years...here's an FTP of some of our stuff...http://www.greenfrogphoto.com/070321csvrflashsampless/  ...look at the Flash folder. It's an object VR we did for Motorola a while back...we shot it and it was put together in Flash...We had to retouch our "object stand" (a piece of armature wire) out of over 100 exposures!..we had a really limited time to do it, so we built our own object rig...no time to order one! It too looked a little "Rube Golbergish" too, but you do what you have to do!

Chris,

You guys do excellent and interesting work.
I happen to be sitting at this moment in an Eames lounge chair just like your QTVR--brown leather, though.
I'd say effective circuit shutter speeds are way too high for pinhole (f.178 !) applications.
Maybe with a gearmotor that turned the camera at one rev. per hour--or something.--but you knew that, right.
I do enjoy a good large format pinhole shot now and then.
A little vintage dirt tracking this past summer.
<a href="http://s170.photobucket.com/albums/u251/gearheaded_photos/drtrk.swf" target="_blank" rel="noopener noreferrer" class="bbc_link bbc_flash_disabled new_win">http://s170.photobucket.com/albums/u251/gearheaded_photos/drtrk.swf</a>

[Chris Schneiter]

Ok, here we go...what if you shot at infinity?

[gerhed]

Ok, here we go...what if you shot at infinity?

Are we entering into a discussion of metaphysics ?

[Chris Schneiter]

I dunno, I get more of an existential vibe from pinholes...

[74cb750]

Nice.