Polaroid mp3 view camera

[jnanian]

i wonder what the QC was for these lenses ?
so many people say the don't cover 4x5 or barely cover ...
maybe my "standards" aren't as strict as other folks ?

mike1234, i look forward to your tests+findings!
i will try to find some of my "not stopped downs"
or if i can ... a digisnappy of illumination on the back of a 5x7 ...

i have a feeling i just don't notice this sort of thing and i am a slacker ...

john

[BetterSense]

Question. Lens coverage better stopped down on opened up? I'm guessing stopped down. I have a cheap medium format camera that vignettes sharply at the corners when stopped down but I think it's because the aperture diaphram is not at the optical center of the lens.

[FilmSprocket]

I stole the lens and shutter for my speed graphic. The shutter is a bit weird because it has no cocking lever or release trigger either. It seems to only work with a cable release, and then it works like a double-action revolver...pressing the cable release both cocks and fires the shutter. The problem I have is my shutter release doesn't seem to stick out far enough to trip the shutter. It works fine if you stick a paperclip in there, though. Then again my shutter release isn't the best. Do you need a special cable release for these things?

Regarding the shutter release: I also have a Polaroid MP-3 Land Camera/Multi-purpose Industrial View Camera, but with a 127/4.7 Rodenstock-Ysaron lens in a Prontor shutter. There are two cable releases, one for opening & closing the diaphragm and the other operates the shutter. On the MP-3 you push a lever at the top right to cock the shutter. At that point the end of the shutter release cable extends and stays at, according to my measurement, 17mm. When the operator is ready to take the photo, the round shutter release button at the front of the unit is pushed and presto! The shutter releases.

Now, if you attach a conventional shutter release cable (not connected to the MP-3) to the lens and slowly push the cable in until you hear a slight 'click', the shutter is charged. Push the cable further and the shutter is released.

I have not used the Ysaron lens yet but have read that it is a Tessar design and has (for 4x5), ".....10 or 12mm left for movements." It also may have rare earth elements. Mine was manufactured between 1961-'66 according to the serial number.

Sorry, I'm getting off-track here as this isn't the lens you have, but, the coverage may be the same for both lenses. I'll have to do some testing myself.

Hope that helps.

-Marc

[Mike1234]

Just checked my 127 Ysaron on an 8x10. There's mechanical vignetting a little more than an inch inside each corner so it could light up a full sheet of 5x7 film. However, the corners are VERY fuzzy wide open. They'll improve stopped down the f/22 but unless you're willing to accept fuzzy corners I wouldn't do it. I'd stick to the limit of 4x5 corner-to-corner straight on.

[FilmSprocket]

Just checked my 127 Ysaron on an 8x10. There's mechanical vignetting a little more than an inch inside each corner so it could light up a full sheet of 5x7 film. However, the corners are VERY fuzzy wide open. They'll improve stopped down the f/22 but unless you're willing to accept fuzzy corners I wouldn't do it. I'd stick to the limit of 4x5 corner-to-corner straight on.

Thanks Mike. Good to know as I'm anxious to try out the lens.

-Marc

[jnanian]

Just checked my 127 Ysaron on an 8x10. There's mechanical vignetting a little more than an inch inside each corner so it could light up a full sheet of 5x7 film. However, the corners are VERY fuzzy wide open. They'll improve stopped down the f/22 but unless you're willing to accept fuzzy corners I wouldn't do it. I'd stick to the limit of 4x5 corner-to-corner straight on.

thanks mike!

john

[Anscojohn]

We used the Tominon on the MP4. This unit was strictly for copy work; nothing at infinity. And we used Type 55 P/N in a single sheet Polaroid holder. If I recall correctly (never a given) there was a limited range of shutter speeds and there was no need for separate shutter cocking--just the cable release.

[jnanian]

We used the Tominon on the MP4. This unit was strictly for copy work; nothing at infinity. And we used Type 55 P/N in a single sheet Polaroid holder. If I recall correctly (never a given) there was a limited range of shutter speeds and there was no need for separate shutter cocking--just the cable release.

there is no T setting, and it only goes to 125/S ...
i like the self "cocking press shutter"
but if you aren't careful and use a shutter release
that is too long, the nib/end of the release will wander and jam inside
the shutter ... what a PITA !

john

[mhines]

I am looking for a camera mount adapter for a poloroid MP-3 stand to attach 35 mm and digitasl cameras.

Thanks.
M. Hines
Fayette County Evidence Center