EX3 Flange to Focal Plane in-air distance. at DVinfo.net

Go Back   DV Info Net > Sony XAVC / XDCAM / NXCAM / AVCHD / HDV / DV Camera Systems > Sony XDCAM EX Pro Handhelds

Sony XDCAM EX Pro Handhelds
Sony PMW-300, PXW-X200, PXW-X180 (back to EX3 & EX1) recording to SxS flash memory.


Reply
 
Thread Tools Search this Thread
Old February 28th, 2009, 12:23 AM   #1
Inner Circle
 
Join Date: Dec 2003
Location: PERTH. W.A. AUSTRALIA.
Posts: 4,356
EX3 Flange to Focal Plane in-air distance.

Does anyone know the flange to focal plane "in-air" distance for the EX3 lens system?
Bob Hart is offline   Reply With Quote
Old February 28th, 2009, 05:32 AM   #2
Major Player
 
Join Date: Nov 2008
Location: Melbourne Australia
Posts: 604
Hi Bob,
I recently made a Nikon adapter for for EX3 using a my shortest Nikon lens as a guide. The Nikon flange to EX3 flange distance ended up at ~ 16.61 mm. According to Wikipedia the Nikon flange to film plane distance is 46.5 mm. The "in air" distance for the EX3 flange to sensor distance will be the difference in the two measurements i.e. 29.89 mm. I do not know what you want the measurement for, if it is for a long focal length lens the distance is nothing like as critical as for a short lens where the depth of focus is next to zero. If you are making a mount i would recommend using a collimator to check your work. I can provide you with a simple formula, (if required) with which you can calculate how much too long your mount is if it is too long - this facilitates final machining.
Alastair Traill is offline   Reply With Quote
Old February 28th, 2009, 05:41 AM   #3
Inner Circle
 
Join Date: Dec 2003
Location: PERTH. W.A. AUSTRALIA.
Posts: 4,356
Alistair.


Thanks you for your response.

I'm looking to make up a mount for the EX3 Letus relay for Letus Extreme to the SI2K's IMS mount system. I will provide for shim adjustment. The B4 Letus relay will be a turnkey solution for aquiring the standard movie frame from the groundglass on the Letus Ultimate.

My objective is to pull in a little more detail by going wider on the larger groundglass of the Extreme by using the wider view of a 2/3" sensor through this 1/2" relay. Hopefully the exit pupil will be wide enough and there won't be edge softness. It will be an abuse of the design for the Letus EX3 relay which is tailored for a 1/2" sensor but I may strike it lucky.

I'll be using a Mini35 with its own IMS mount system as a collimation projector, rough and ready method but the P+S build quality will get me by as it has already with modding other lenses. If anyone ever does this, do not run the projection lamp for any longer than about 30 seconds at a time over a five minute cycle, otherwise you may crack the prisms or the adjustable mirror in the flip enclosure.

Last edited by Bob Hart; February 28th, 2009 at 05:46 AM. Reason: error
Bob Hart is offline   Reply
Reply

DV Info Net refers all where-to-buy and where-to-rent questions exclusively to these trusted full line dealers and rental houses...

Professional Video
(800) 833-4801
Portland, OR

B&H Photo Video
(866) 521-7381
New York, NY

Z.G.C.
(973) 335-4460
Mountain Lakes, NJ

Abel Cine Tech
(888) 700-4416
N.Y. NY & L.A. CA

Precision Camera
(800) 677-1023
Austin, TX

DV Info Net also encourages you to support local businesses and buy from an authorized dealer in your neighborhood.
  You are here: DV Info Net > Sony XAVC / XDCAM / NXCAM / AVCHD / HDV / DV Camera Systems > Sony XDCAM EX Pro Handhelds

Thread Tools Search this Thread
Search this Thread:

Advanced Search

 



Google
 

All times are GMT -6. The time now is 09:38 PM.


DV Info Net -- Real Names, Real People, Real Info!
1998-2017 The Digital Video Information Network