Alpha 16 enquiry
Posted 26 April 2007 - 03:34 AM
Does the Alpha 16 C mount version have single frame? If so, are single frames exposed with a regular cable release? When doing time lapse with a K3, it is recommended not only to cover the viewfinder but also to cover the lens between exposures if the interval time is considerably long. Is it necessary to cover the lens of the Alpha 16 between exposures when doing single frame shooting?
Posted 27 April 2007 - 04:42 PM
I hope, the answer can be interested for other film makers too.
I'm very curious about a compact Russian 16mm movie camera called an Alpha 16. There is very little information about this camera on the Internet but from what I can gather, it has a reflex viewfinder, has a few different running speeds including 24fps, and some versions of the camera have an interchangeable C mount. I do know there is a version that has a fixed lens. How reliable is this camera generally - ie is an Alpha 16 in good working order usually free from film jamming and scratching etc? Also, how steady is the footage produced by such a camera? Obviously, it wouldn't have a registration pin but there are many movie cameras lacking a registration pin that have remarkably good registration.
Ukarainian 16 mm amateur cine camera "Alpha-poluavtomat" Kiev-16, semi-automatic device, made of Kiev factory of automatic of Petrovsky.
The camera have mechanical spring motor, 100ft daylight spool film loading system, refelx viewfinder with semi- transparent glass, C-mount, TTL meter.
The camera have very low weight ( 1.6 kg ) because, the outside parts of body made from polycarbone resin Diflon.
Alpha-16 have reflex viewfinder, but, this is not mirror shutter disk.
The camera have one blade, 170 degree, black mirror disk near film gate, at one plane with film gate ( similar of not reflex camera ) and have semi-transparent glass between lens mount and ground glass.
This is glass divide of light on two ways - on film and on ground glass.
The picture on ground glass not blink. But, you lost a some light on film.
The camera have speeds : 12, 16, 24, 32 fps and single frame shooting.
=and some versions of the camera have an interchangeable C mount.
All versions of Alpha-16 cameras had C-mount and interchangeable lens.
The original set of camera have VEGA-7 20 mm F2.0 prime lens, angle of view 35 degree.
About reliable of camera, free from film jamming and scratching.
The camera have very good design of body and mechanism.
From my practical experience, i had more problem with jamming of film inside of K-3 cameras from Alpha.
Alpha have two plane, coaxial type of spools, and film change plane of moving.
That's why, the film contact with more rollers.
But, i don't have problme with scratching.
But, i must underline, this is not professional cine camera with quality of Kinor-16 SX.
Alpha have very good mechanism with precision metal gears ( Kiev factory of automatic make a more high precision devices at mechanics at base production line ).
The one problem ? can be with semi- transparent glass.
The glass can have dust, scrathes, can be broken ( If the anybody set of C-mount lens with big parts after mount ).
The steady is the footage of camera .
I don't have registration tests fo Apha-16 and Bolex , but, I think, Alpha have similar quality of footages of K-3 cameras.
All Alpha cameras have single frame mode with shutter speed 1/40 s.
You can control of single frame shooting by cable release or by start-stop button.
About Time lapse mode.
I think, Alpha will better for time lapse shooting, because, have shutter disk near film gate with one plane with film gate, And will cover of film gate very good.
You can take away of semi-transparent glass.
You lost of reflex function, but, you will have 100% light in film, good shutter and can set of any C-mount lens.
If the camera and lens will have correct flange focal distance, you can focusing of lens by distance ring on lens.
If you will use camera with semi-transparent glass, I think, the viewfinder must be closed, because, any reflection light from viewfinder will bad for final picture.
Alpha have 3/8? screw for connect with tripod.
Posted 27 April 2007 - 06:55 PM
But... the pellicle mirror must be about as thick as a gelatin filter, or perhaps thicker owing to being mounted at 45 degrees? So just removing it will throw off the focus on the film.
You can take away of semi-transparent glass.
You lost of reflex function, but, you will have 100% light in film, good shutter and can set of any C-mount lens....
Posted 28 April 2007 - 03:43 AM
Posted 28 April 2007 - 02:13 PM
I know that with the prism in a Bolex H16 Reflex, there will be a loss of quality when regular (non RX) wide angle lenses are used, unless they are stopped down considerably. What I'd like to know is if the pelicle mirror in an Alpha 16 would cause any similar optical problems with certain focal lenght lenses - or any C mount lenses that were not specifically designed for that particular camera.
There's a lot less glass for the light to travel through. CP's SPR BNC conversions used a pellicle, but did not need special lenses.
Posted 28 April 2007 - 03:27 PM
Good to hear! Now my mind is at rest...
Posted 28 April 2007 - 03:42 PM
Posted 29 April 2007 - 06:45 AM
However, something else has come up. I would like to use wide angle lenses with such a camera - for example a 10mm or 12mm. Such short focal length lenses will be a very short distance from the film (in the case of a 10mm lens - 10mm from the film when focused on infinity) I wonder what the chances are of hitting the mirror.
Isn't this the problem that retrofocus lenses were designed to fix? (This isn't a rhetorical question.) Are the common c-mount 10mm (angenieux, switar, schneider...) lenses retrofocus?
Posted 29 April 2007 - 07:03 AM
Posted 29 April 2007 - 08:05 AM