Vivitar Zoom Thyristor 250

The Rebel Bear

H
The Rebel Bear

  • 0
  • 2
  • 127
Great Sand Dunes NP

A
Great Sand Dunes NP

  • 5
  • 2
  • 188
San Jose Museum of Art

A
San Jose Museum of Art

  • 0
  • 0
  • 128
San Jose Museum of Art

A
San Jose Museum of Art

  • 1
  • 0
  • 137

Recent Classifieds

Forum statistics

Threads
178,614
Messages
2,456,868
Members
94,588
Latest member
perfectiontips
Recent bookmarks
0

WetMogwai

Member
Joined
Oct 29, 2009
Messages
152
Shooter
Multi Format
I have a Vivitar Zoom Thyristor 250 that has a switch I don't understand. I've looked for a manual, but I can only find other models. The switch has three positions, M, orange, and green. I assume it has something to do with flash intensity. I attached an image. How do I use this switch?
 

Attachments

  • IMG_0584.JPG
    IMG_0584.JPG
    121 KB · Views: 93

Mike Wilde

Member
Joined
Aug 10, 2006
Messages
2,907
Location
Misissauaga
Shooter
Multi Format
M - flash is in manual mode. It will dump all charge and so set f stop of camera to match the distance of the subject you are intersted in pointing this thing at.

Red - set camera aperture to f/8 and the flash will automatically quench part way though it's discharge when it senses enough light has been emitted. Function good to as far away as the distance is on it opposite the calculator dal.

Green - same as red, but f/11, but less effective automatic lighting distance. You gain a bit more depth of field with the red, versus the green.

You have to set the dial to match the speed of film in the camera, and set the shutter seed of the camera no faster than it's synch speed (usually marked in red, or with an X etc on the shutter speed dial of focal plane shutter cameras.

If you have an old rangefinder, etc with the shutter in the lens, the thing will synch at any spped.

Take care to use on X contact; olderish cameras sometimes have an M and X contact. M is for flashbulbs, and will fire the almost intantaneous lighting electronic flash too early. Flashbulbs neded time to reach thier peak light emitting intensity.

Good shooting.

If it works on olne a hot shoe socket then that socket will be an x synch one.
 
OP
OP

WetMogwai

Member
Joined
Oct 29, 2009
Messages
152
Shooter
Multi Format
Thanks. I'll try it next time I need a flash, though I hope it doesn't happen soon. I try to avoid flash as much as I can. I like having the option if I really need it, though.
 

MattKing

Moderator
Moderator
Joined
Apr 24, 2005
Messages
38,988
Location
Delta, BC, Canada
Shooter
Multi Format
What Mike said, with one refinement.

You will note that there is an ASA/DIN scale. In the picture, you cannot quite see what it is set to, but I assume it is something like ASA 200.

As Mike said, you have to set the ASA/DIN dial to match the film in the camera. When you do, the dial with the F8 and F11 that Mike referred to will also move, and you will see that the red and green markers will line up with new f/stops. With the new film, you use those new f/stops.

Matt
 
Photrio.com contains affiliate links to products. We may receive a commission for purchases made through these links.
To read our full affiliate disclosure statement please click Here.

PHOTRIO PARTNERS EQUALLY FUNDING OUR COMMUNITY:



Ilford ADOX Freestyle Photographic Stearman Press Weldon Color Lab
Top Bottom