Camera Mounts & Offsets¶

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I'm just going to cover some of these I'm just going to cover some of these other things here on these setups. So, other things here on these setups. So, other things here on these setups. So, there is here a front nodal offset. Now, there is here a front nodal offset. Now, there is here a front nodal offset. Now, this is quite important to set, this is quite important to set, this is quite important to set, especially if you're going to be especially if you're going to be especially if you're going to be exporting moves to 3D or you're exporting moves to 3D or you're exporting moves to 3D or you're importing moves to 3D, or you for importing moves to 3D, or you for importing moves to 3D, or you for instance have a very long probe lens and instance have a very long probe lens and instance have a very long probe lens and you wanted to move around the probe you wanted to move around the probe you wanted to move around the probe lens. The front nodal offset is the lens. The front nodal offset is the lens. The front nodal offset is the point of view of the lens, which for a point of view of the lens, which for a point of view of the lens, which for a prime lens normally is pretty much prime lens normally is pretty much prime lens normally is pretty much where the glass is, where the front of where the glass is, where the front of where the glass is, where the front of the glass is. So, you would measure this the glass is. So, you would measure this the glass is. So, you would measure this distance from your film plane, distance from your film plane, distance from your film plane, okay, or your sensor, okay, or your sensor, okay, or your sensor, uh as the case may be with this camera, uh as the case may be with this camera, uh as the case may be with this camera, and it's about and it's about and it's about 12 cm. So, again, I would put in 12 cm. So, again, I would put in 12 cm. So, again, I would put in .12 in here. Next, we've got the side .12 in here. Next, we've got the side .12 in here. Next, we've got the side nodal offset, which if we look at the nodal offset, which if we look at the nodal offset, which if we look at the diagram is diagram is diagram is basically an offset, which typically basically an offset, which typically basically an offset, which typically should be zero. There really shouldn't should be zero. There really shouldn't should be zero. There really shouldn't be an offset like shown in the picture be an offset like shown in the picture be an offset like shown in the picture here. Okay? Unless you have some strange here. Okay? Unless you have some strange here. Okay? Unless you have some strange lens, then you've got the vertical lens, then you've got the vertical lens, then you've got the vertical offset, which again there shouldn't be, offset, which again there shouldn't be, offset, which again there shouldn't be, that should remain zero, so you don't that should remain zero, so you don't that should remain zero, so you don't really need that. And then you've got really need that. And then you've got really need that. And then you've got the measure offset. Now, this is the the measure offset. Now, this is the the measure offset. Now, this is the distance from your film plane, distance from your film plane, distance from your film plane, okay, or your sensor, okay, or your sensor, okay, or your sensor, to wherever it is that you're measuring to wherever it is that you're measuring to wherever it is that you're measuring from. Now, if you measure from the from. Now, if you measure from the from. Now, if you measure from the sensor, then that value is zero. But if sensor, then that value is zero. But if sensor, then that value is zero. But if for example, you wanted to measure from for example, you wanted to measure from for example, you wanted to measure from maybe here, I don't think that's very maybe here, I don't think that's very maybe here, I don't think that's very practical, or maybe from the front of practical, or maybe from the front of practical, or maybe from the front of the lens, okay? Then you would measure the lens, okay? Then you would measure the lens, okay? Then you would measure the distance from here to the front of the distance from here to the front of the distance from here to the front of the lens, and you would put that in as the lens, and you would put that in as the lens, and you would put that in as an offset here. Okay? And you need to an offset here. Okay? And you need to an offset here. Okay? And you need to make sure what that you put in the right make sure what that you put in the right make sure what that you put in the right uh uh uh negative or positive value. So, in this negative or positive value. So, in this negative or positive value. So, in this case, it's showing me that positive is case, it's showing me that positive is case, it's showing me that positive is from the film plane or the sensor from the film plane or the sensor from the film plane or the sensor to my measure point to my measure point to my measure point with a positive direction in that with a positive direction in that with a positive direction in that direction. If I was actually measuring direction. If I was actually measuring direction. If I was actually measuring from the back of the camera, it would be from the back of the camera, it would be from the back of the camera, it would be a negative value. a negative value. a negative value. I'm going to measure from my sensor and I'm going to measure from my sensor and I'm going to measure from my sensor and my film plane, so I'm not going to I'm my film plane, so I'm not going to I'm my film plane, so I'm not going to I'm just going to leave that at zero. And just going to leave that at zero. And just going to leave that at zero. And the focus assist is really unnecessary the focus assist is really unnecessary the focus assist is really unnecessary if you have a focus assist module, which if you have a focus assist module, which if you have a focus assist module, which we don't have on this rig. But in that we don't have on this rig. But in that we don't have on this rig. But in that case, you would put the distance in from case, you would put the distance in from case, you would put the distance in from the sensor to the little focus assist the sensor to the little focus assist the sensor to the little focus assist module that is helping to automatically module that is helping to automatically module that is helping to automatically focus. It is worthy to note that focus. It is worthy to note that focus. It is worthy to note that we only have these values here, and we only have these values here, and we only have these values here, and they're all relative to the sensor or they're all relative to the sensor or they're all relative to the sensor or the film plane the film plane the film plane um because we are using a camera mount. um because we are using a camera mount. um because we are using a camera mount. Whereas if we use a normal Whereas if we use a normal Whereas if we use a normal uh if uh if uh if whereas if we don't use a camera mount whereas if we don't use a camera mount whereas if we don't use a camera mount setup, okay, we have to put everything setup, okay, we have to put everything setup, okay, we have to put everything into lens setup. So, for example, if I into lens setup. So, for example, if I into lens setup. So, for example, if I go to camera mount, go to camera mount, go to camera mount, Okay, I'll just close this, sorry. Okay, I'll just close this, sorry. Okay, I'll just close this, sorry. So, for example, if I go to camera mount So, for example, if I go to camera mount So, for example, if I go to camera mount and choose not using mount, and choose not using mount, and choose not using mount, Okay, apply. Okay, apply. Okay, apply. And now go to my lens setup for that lens, for that lens, you'll see there more things to fill in you'll see there more things to fill in you'll see there more things to fill in here. here. here. Um and they're not relative necessarily Um and they're not relative necessarily Um and they're not relative necessarily to the film plane. So, my nodal point is to the film plane. So, my nodal point is to the film plane. So, my nodal point is the distance from the optical axis here the distance from the optical axis here the distance from the optical axis here to to to the joint, okay? That's my X nodal the joint, okay? That's my X nodal the joint, okay? That's my X nodal offset. And my Y is sideways, which is offset. And my Y is sideways, which is offset. And my Y is sideways, which is normally zero, but my Z is from that normally zero, but my Z is from that normally zero, but my Z is from that joint to joint to joint to the nodal point here, which would the nodal point here, which would the nodal point here, which would normally be the front of the glass or normally be the front of the glass or normally be the front of the glass or somewhere like that. So, these values somewhere like that. So, these values somewhere like that. So, these values here would change for different lenses, here would change for different lenses, here would change for different lenses, obviously, but also if the camera was obviously, but also if the camera was obviously, but also if the camera was mounted a bit different. So, if the mounted a bit different. So, if the mounted a bit different. So, if the camera was shifted along here, all these camera was shifted along here, all these camera was shifted along here, all these values would have to be changed as well. values would have to be changed as well. values would have to be changed as well. Whereas the advantage of using a camera Whereas the advantage of using a camera Whereas the advantage of using a camera mount is that you only change how far mount is that you only change how far mount is that you only change how far the camera shifted, and all the other the camera shifted, and all the other the camera shifted, and all the other batteries remain the same. So, if I go batteries remain the same. So, if I go batteries remain the same. So, if I go back to using my back to using my back to using my camera mount. camera mount. camera mount. Okay? If my camera happens to shift Okay? If my camera happens to shift Okay? If my camera happens to shift relative relative relative to this distance or this distance here, to this distance or this distance here, to this distance or this distance here, okay, along okay, along okay, along the sliding plate, the sliding plate, the sliding plate, I'd have to change it for every lens. I'd have to change it for every lens. I'd have to change it for every lens. Whereas here, I just change it for my Whereas here, I just change it for my Whereas here, I just change it for my camera mount camera mount camera mount and every lens remains the same because and every lens remains the same because and every lens remains the same because it's relative it's relative it's relative to the camera itself, not the film to the camera itself, not the film to the camera itself, not the film plane. Let me do that again cuz I actually Let me do that again cuz I actually didn't choose. So, if I go didn't choose. So, if I go didn't choose. So, if I go red camera, red camera, red camera, come apply. Okay, now it's using mount. come apply. Okay, now it's using mount. come apply. Okay, now it's using mount. So, if I go to my lens setup So, if I go to my lens setup So, if I go to my lens setup and go and go and go there, all these values are relative to there, all these values are relative to there, all these values are relative to the camera. There's no image of the the camera. There's no image of the the camera. There's no image of the robot here at all because it's nothing robot here at all because it's nothing robot here at all because it's nothing to do with the robot. It's just relative to do with the robot. It's just relative to do with the robot. It's just relative to my camera. So, if my camera moves, it to my camera. So, if my camera moves, it to my camera. So, if my camera moves, it doesn't affect any of these settings doesn't affect any of these settings doesn't affect any of these settings I've created for my lenses and I can use I've created for my lenses and I can use I've created for my lenses and I can use those lenses on any camera wherever that those lenses on any camera wherever that those lenses on any camera wherever that camera may be camera may be camera may be or however that camera may be mounted.