Thread: MAXIMUM LENS MOUNTING DEPTH - Red Ranger Monstro & DSMC2 - PL

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  1. #1 MAXIMUM LENS MOUNTING DEPTH - Red Ranger Monstro & DSMC2 - PL 
    Hello,

    I've been looking all around web & users manuals on Red.com but couldn't find what I'm looking for.

    I would like to know as the title says the maximum lens mounting depth possible without hurting OLPFs or touching the mount on a PL Red Camera. I'm working on an ambitious rehouse project but I absolutely need to have these measurements before going any further.

    See attached pictures from Arri LF and Mini LF User Manuals technical drawing that I'm desperately trying to find.

    Hope someone can help me on this.

    Thanks,
    Eden.
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  2. #2  
    Senior Member Shaeden Gallegos's Avatar
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    Really good question! I have a converted Lomo Standard set that seems to hit the OLPF when focusing. The black flange telescopes. I wish I could find a workaround, because I really love the lenses.
    You don't have to see something to believe in it, but you have to believe in something to see it.
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  3. #3  
    Shaeden,

    Thanks for the input, that would mean that the clearance is quite shallow on Red. Can you be more precise regarde the mount and body it was used on?
    Also do you think you can measure the depths from the mount to the back end of the lens?

    Do you have any chance to mount them on Alexa LF or SXT with Internal Filter Module?

    Thanks,
    E.
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  4. #4  
    Senior Member Jacek Zakowicz's Avatar
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    Quote Originally Posted by Shaeden Gallegos View Post
    Really good question! I have a converted Lomo Standard set that seems to hit the OLPF when focusing. The black flange telescopes. I wish I could find a workaround, because I really love the lenses.
    We have converted many Lomo spherical and anamorphic lenses to PL mounts for RED cameras and never had an issue. Alexa Mini /Amira are more restrictive than RED
    Jacek Zakowicz, Optitek-dot-org, jacek2@optitek.org
    Professional Broadcast and Digital Cinema Equipment
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  5. #5  
    Senior Member Shaeden Gallegos's Avatar
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    I'll try and see if I can measure when I get back to California in a week. It's a PL mount on DSMC2 camera. When I was focusing with my lens I noticed it was getting hard to turn the focus ring. When I switched lenses I saw a ring mark on the plastic of the OLPF.
    You don't have to see something to believe in it, but you have to believe in something to see it.
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  6. #6  
    Senior Member Shaeden Gallegos's Avatar
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    Quote Originally Posted by Jacek Zakowicz View Post
    We have converted many Lomo spherical and anamorphic lenses to PL mounts for RED cameras and never had an issue. Alexa Mini /Amira are more restrictive than RED
    Love your work Jacek! I will try to post a picture when I get back home...I've been gone for 2 months because of COVID-19. It's the older Lomo Standard Sphericals. For some reason they have a super long flange back. Plus, when you focus the flange telescopes.
    You don't have to see something to believe in it, but you have to believe in something to see it.
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  7. #7  
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    Is there a reason you can't just measure from the pl flange to the olpf? It's a pretty straight forward procedure. If you don't have an apropriate measuring tool, this should get you there -

    https://www.amazon.com/iGaging-Elect...8958756&sr=8-3
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  8. #8  
    Quote Originally Posted by Shaeden Gallegos View Post
    I'll try and see if I can measure when I get back to California in a week. It's a PL mount on DSMC2 camera. When I was focusing with my lens I noticed it was getting hard to turn the focus ring. When I switched lenses I saw a ring mark on the plastic of the OLPF.
    And I suppose you'd know that on a RED DSMC2 camera the back focus could be moved to a point where you'd have enough clearance for this lens. Right?
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  9. #9  
    Senior Member Jacek Zakowicz's Avatar
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    Quote Originally Posted by Neil Abeynayake View Post
    And I suppose you'd know that on a RED DSMC2 camera the back focus could be moved to a point where you'd have enough clearance for this lens. Right?
    It doesn't work this way. Besides the fact that changing the sensor position disturbs all other lenses when you move the sensor the lens has to move as well so there always be the same clearance.
    Jacek Zakowicz, Optitek-dot-org, jacek2@optitek.org
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  10. #10  
    Quote Originally Posted by Jacek Zakowicz View Post
    It doesn't work this way. Besides the fact that changing the sensor position disturbs all other lenses when you move the sensor the lens has to move as well so there always be the same clearance.
    Hi Jacek, Hope you guys are doing well. We need to go back to the days of pre-COVID-19, soon. I certainly miss those days when we met people in person and had a meal together, shoot the breeze etc.

    I was referring to this specific instance. If the operator knows what they are doing, you can change the back focus anytime. We used to do this during our Television studio production days.

    Sometimes a DoP might insist that he/she wants to use a specific lens (perhaps for the looks or likes the freggin' lens, getting a boner etc.) If and when this occurs, you could resort to adjusting the back focus or by inserting flanges or shims to a cinema lens.
    Last edited by Neil Abeynayake; 05-10-2020 at 04:14 PM.
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