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bmpcc 6k film plane mark
Posted:
Tue Aug 18, 2020 8:30 amby mimimilus
Hey!
My camera did not came with the film plane mark. Which would be no problem, because I want to put a screw on my rig where the tapemesure can hang from.
But sadly, I did not found any information about where the sensor is located...
So if you know. Can you tell me in milimeters how far is it back from the front of the lens mount?
I would highly appreciate it. Thank you in advance.
Re: bmpcc 6k film plane mark
Posted:
Fri Oct 08, 2021 4:06 pmby GalinMcMahon
Bump. It is crazy that there is no mark for this. Someone said to measure back 19.25mm from the front inside of the lens mount but didnt specify whether it's the metal mount or the plastic part with the connectors. This is a critical measurement for focusing so I am baffled as to how BM didnt print this standard mark.
Re: bmpcc 6k film plane mark
Posted:
Fri Oct 08, 2021 8:22 pmby John Griffin
GalinMcMahon wrote:Bump. It is crazy that there is no mark for this. Someone said to measure back 19.25mm from the front inside of the lens mount but didnt specify whether it's the metal mount or the plastic part with the connectors. This is a critical measurement for focusing so I am baffled as to how BM didnt print this standard mark.
EF focus plane to lens flange in 44mm. Not sure why you need this on a digital camera for focusing when you have a live feed from the sensor?
Re: bmpcc 6k film plane mark
Posted:
Tue Oct 04, 2022 1:27 amby cj-adams
Actually.....there is one new very good reason to have this information....in some cases we are now using 3d Lidar systems to actually do live autofocus with these cameras on gimbals like the DZjI RS3 Pro...and they require the measurement from the focal plane to the front of the lidar unit for calibration!
Re: bmpcc 6k film plane mark
Posted:
Mon Nov 07, 2022 7:40 pmby dsbnola
Yes, I'm trying to figure out this as well so I can use the Lidar system with DJI's Ronin RS 3 pro gimbal stabilizer. Any help would be appreciated!
Re: bmpcc 6k film plane mark
Posted:
Mon Nov 07, 2022 8:53 pmby Mark Foster
https://en.wikipedia.org/wiki/Flange_focal_distance6K, 6K G2, 6Kpro = EF = 44mm
4K = MFT = 19,25mm
- focal-flange-distance-4.jpg (81.14 KiB) Viewed 8942 times
©brian smith
https://briansmith.com/flange-focal-distance-guide/.
Re: bmpcc 6k film plane mark
Posted:
Mon Nov 07, 2022 9:03 pmby cjadams
Mark Foster wrote:https://en.wikipedia.org/wiki/Flange_focal_distance
6K, 6K G2, 6Kpro = EF = 44mm
4K = MFT = 19,25mm
I think i did it right - Well i think i did it right.. I basically did what support said..
Started at the metal mount and then subtract 35mm Should be the focal plane...- then add or subtract depending on if your in front of or behind that point.
focal-flange-distance-4.jpg
©brian smith
https://briansmith.com/flange-focal-distance-guide/.
Re: bmpcc 6k film plane mark
Posted:
Mon Nov 07, 2022 9:04 pmby cjadams
Re: bmpcc 6k film plane mark
Posted:
Thu Dec 15, 2022 3:09 amby kgilchrist21
Any confirmations? I've following the convo because I too have the LiDAR Range Finder on the RS3. I have the BMPCC 4K, and determining where to calculate the focal plane, to the end of the LiDAR has been a guess. I've left it at the default of 75mm (2.95 inches), but I don't REALLY know if that's accurate.
bmpcc 6k film plane mark
Posted:
Mon Dec 19, 2022 10:21 amby carlomacchiavello
Do you have lenses with backfocus control?
Are you sure that focus distance on lenses are exactly what you measure on real world.
With exception of expansive cine lens and broadcast lenses, classic lenses not are so perfect on focus metering, then to setup linear autofocus is better to do visual (monitor) control of focus and distance recorded.
With a friend of mine we tested many lenses (L series) with rs3 and lindar system and everyone give us a small (mm) difference, but enought to go out of focus when you are close to a subject.
Inviato dal mio iPhone utilizzando Tapatalk
Re: bmpcc 6k film plane mark
Posted:
Mon May 15, 2023 10:49 amby Uri1977
Any solution for this...? We need this distance to be put in the RS3 Pro...
Best regards, Uros
Re: bmpcc 6k film plane mark
Posted:
Tue May 16, 2023 9:13 pmby Howard Roll
Uri1977 wrote:Any solution for this...? We need this distance to be put in the RS3 Pro...
Best regards, Uros
Why? It’s already been answered a couple times. MFT=19.25mm, EF=44mm. The flange depth is the (corrected for ND, IR) distance from the mount face to the sensor if it is still unclear.
Good Luck
Re: bmpcc 6k film plane mark
Posted:
Wed May 17, 2023 9:44 amby roger.magnusson
They did add a marker for the sensor plane to more recent camera bodies, the 6K Pro and 6K G2.
Re: bmpcc 6k film plane mark
Posted:
Tue Apr 23, 2024 11:39 amby Demetrius Spencer
So if I'm using the DJI Lidar with my Pocket 6K and the Lidar sticks out slightly past the ef mount would I measure the distance from the end of the lens mount area to the end of the lidar and add 44mm to that for Toal distance from the sensor to the end of the Lidar?
Re: bmpcc 6k film plane mark
Posted:
Tue Apr 23, 2024 12:14 pmby Phil999
yes.
For Dji Lidar users, it is advantageous to use the Dji Ronin app, because it contains a good collection of focus throw measurements of lenses. With the app, for a collection of lenses, one doesn't have to do lens calibration at all. For those who don't know the procedure:
1. run Dji Ronin app, switch on Focus Pro/RS3/RS4, let both connect with each other
2. in the Dji Ronin app, select LiDAR Lens Profile. Select your lens and, on the camera, set its focus to infinity using the Focus Pro/RS3/RS4 wheel
3. in the Dji Ronin app, tap adjust to fine-tune focus (switch on camera with focus peaking engaged)
4. in the Dji Ronin app, tap confirm
I wish someone told me that earlier.
Re: bmpcc 6k film plane mark
Posted:
Tue Apr 23, 2024 1:14 pmby Michel Rabe
That's very nice.
Such great times.