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  • Hey all, just changed over the backend after 15 years I figured time to give it a bit of an update, its probably gonna be a bit weird for most of you and i am sure there is a few bugs to work out but it should kinda work the same as before... hopefully :)

Bausch&Lomb CinemaScope Baltars.

Ignacio Aguilar said:
When I bought my set of "Standard" Baltars I found that problem too, but Van Diemen is doing them for me and the lenses they have already finished seem to work extremely well. Other companies found the BNC Baltars too difficult to do the conversion.
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Hmm, yes but looks like a lot of dead weight metal in the back and if they managed to get the 30mm on the alexa then normally the longer focal lengths are protruding less in the back... Not sure who has the most cavity alexa or weapon. I assume weapon 8k VV got more room than most. So I hope for a bit of luck and a good mill.

Another way of doing it is to remove the mount completly and build a Epic mount. if the olpf is cleared then simply make a construction that let me screw the lens on the front of camera where the camera mount normally goes. That would for sure make lens changes a bit difficult but Not that I would have too many lenses to swap in between and if having such system it would be almost easier to just get more camera brains and screw one onto each lens :)

Flange distance, found these:

Mitchell BNCR 61.468 mm
Arri PL 52 mm
BNC Mitchell is 2.420 inches which equals 61.468mm.
Mitchell BNC & BNCR (nominal) 2.420

Mitchell BNC & BNCR (recommended) 2.4188 Tolerance +/- 0.0001

For Photosonics BNCR mount 2.419 Tolerance 0.0005

Source: Samuelson's Hands on Manual
 
Björn, what focus length do you have? It is not clear from the Flickr whether you have 2 or 3 lenses.
You have 50 and 75 mil?

I have flange data of 50 and 75mm Baltars.
 
Here is NIKFI Catalogue where you can find back focal distances of Baltars and Supers:

Baltar & Super Baltar BOOK by NIKFI - a part of NIKFI Catalog of 1969 (with text layer).pdf

Lenses tested:


  1. Baltar 75mm f/2.3
  2. Baltar 100mm f/2.3
  3. Super Baltar 20mm f/2
  4. Super Baltar 25mm f/2
  5. Super Baltar 35mm f/2
  6. Super Baltar 50mm f/2
  7. Super Baltar 75mm f/2
  8. Super Baltar 100mm f/2


It is in Russian, so use this pic as a key:

5ukzc7
 
Ilya O. said:
Björn, what focus length do you have? It is not clear from the Flickr whether you have 2 or 3 lenses.
You have 50 and 75 mil?

I have flange data of 50 and 75mm Baltars.
Click to expand...


Cool, Yes 50 and 75mm is what I have.
 
Well, I see 50mm has 37.5mm BFD, and 75mm has 56.6mm (that is distance from the last lens vertex to the film plane).
That should be more than enough to mount on any PL or eve Canon EF mount cam.

!!! But we still do not know how much the barrel or the mount of a lens protrudes...

Its a pity we do not have smth like this:

wtajrI


It is Super Baltar's barrel dimensions.
 
Ilya O. said:
Well, I see 50mm has 37.5mm BFD, and 75mm has 56.6mm (that is distance from the last lens vertex to the film plane).
That should be more than enough to mount on any PL or eve Canon EF mount cam.

!!! But we still do not know how much the barrel or the mount of a lens protrudes...

Its a pity we do not have smth like this:

wtajrI


It is Super Baltar's barrel dimensions.
Click to expand...


Cool info!
But from looking at this it looks almost like it protrudes to the film gate. But also it seams like it=s something that can be milled away. As it does not look like its much of importance in that back part. mor just to make a nice blacked out tunnel between the last element and the film plane.



31354123503_f4b4d4d482_o.jpg
[/url]s-l1600-6 by Björn Benckert, on Flickr[/IMG]
 
Well, yes, this mount you can throw away and there is plenty of space to mount on your cam mount.

What I meant was it is good to know lens units (lens heads/optical blocks) dimensions at the rear, they typically protrude some mm-s after the last glass element.
 
Ilya O. said:
Well, yes, this mount you can throw away and there is plenty of space to mount on your cam mount.

What I meant was it is good to know lens units (lens heads/optical blocks) dimensions at the rear, they typically protrude some mm-s after the last glass element.
Click to expand...

From looking at helium cavity it seems like the olpf is moved much further out from the sensor than what we had on dragon. I wonder what the difference is between the sensor / image plane and the glas closest to lens is in millimeter on helium.
 
Before Jarred kindly sheds us some light on the Helium mount inner dimensions, Björn, did you maybe try to somehow put 50mm in front of Helium sensor to see if it captures any pics?
 
Ilya O. said:
Before Jarred kindly sheds us some light on the Helium mount inner dimensions, Björn, did you maybe try to somehow put 50mm in front of Helium sensor to see if it captures any pics?
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That will happen in probably less than 1 minute after the lenses gets here :) They are still in the hands of the shipping company. Just ordered them. So the pictures I have are from the seller.
 
sorry, Björn me foolish:-) (I was 100% sure the flickr pics are yours so the lenses are at hand)
 
Last edited:
I'm moving back to Europe
You guys have a LOT of time on your hands ;-)
 
This one was also shot on baltars. but loose ana front elements as those combo lenses with fixed elements where low in supply.
https://m.youtube.com/watch?v=SFMmJMNRv-Q

Always liked that film.

Apperently they had a little misshap in the distribution the film was shot and finalized in 2.66 but then when ading the audio they simply over wrote the left part of the frame onnthe positives so the image got cropped down on the left side so all titles got a bit off centered. :)
 
Jacek Zakowicz said:
I'm moving back to Europe
You guys have a LOT of time on your hands ;-)
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Don't know about that. Those stupid ideas about buying things I don't need or know nothing about usually coming up late during at night during the graveyard shift when I sit at the office and render things. I been doing 16 hour days at least 6 days a week all trough christmas newyear and back all the way from october and I see no pause before the summer Simply had too many cool projects comming in that I just did not want to turn down. Buying stupid things off eBay is a stress syndrome of mine, just reading and writing comments here. Something i do during the 10 minute renders :)
 
Don't be too hard on yourself Bjorn ;-)
We all have our weaknesses. Yours are old anamorphic lenses... I'm sure if you do it long enough you will get the barn find of a life time. Probably not on ebay- too much exposure and fellow film makers with a lot o time on their hands...;-)
 
Jacek Zakowicz said:
Don't be too hard on yourself Bjorn ;-)
We all have our weaknesses. Yours are old anamorphic lenses... I'm sure if you do it long enough you will get the barn find of a life time. Probably not on ebay- too much exposure and fellow film makers with a lot o time on their hands...;-)
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Hmm,
Not sure I did not say how little I paid for these did I? :)
 
you paid too much Bjorn.. But it satisfied your addiction for a little while-you've got your fix...;-)
 
Björn Benckert said:
Don't know about that. Those stupid ideas about buying things I don't need or know nothing about usually coming up late during at night during the graveyard shift when I sit at the office and render things. I been doing 16 hour days at least 6 days a week all trough christmas newyear and back all the way from october and I see no pause before the summer Simply had too many cool projects comming in that I just did not want to turn down. Buying stupid things off eBay is a stress syndrome of mine, just reading and writing comments here. Something i do during the 10 minute renders :)
Click to expand...

I know EXACTLY how you feel! I too am a late night gear "researcher".

Glad you have some many cool projects!!
 
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