Welding
- Thread starter Sherman
- Start date
BLUESPIDER
DVXuser Ninja
Re: Welding
Keep your distance and play with your ND filters. I don't think you should leave the camera static on a shot too long. The flare off the welding may cause internal damage. I'm not sure though. I remember shooting my Hi8 at a lunar eclipes and it left an imprint. be careful.
Keep your distance and play with your ND filters. I don't think you should leave the camera static on a shot too long. The flare off the welding may cause internal damage. I'm not sure though. I remember shooting my Hi8 at a lunar eclipes and it left an imprint. be careful.
Bill__Turner
Well-known member
Re: Welding
perhaps obvious, but make sure you use a clear filter or something in front of the lens, over the years I have seen a number of lenses damaged by hot fragments.
If you use heavy ND's then they would eliminate the need for a clear--unless you also wished to protect them from possible damage--- you could just buy a piece of 1/8" plate glass and rig a way to shoot thru it, tilt it a bit and elimnate the possiblity of a kick or ghost.
Bill Turner
Century Division
Schneider Optics
perhaps obvious, but make sure you use a clear filter or something in front of the lens, over the years I have seen a number of lenses damaged by hot fragments.
If you use heavy ND's then they would eliminate the need for a clear--unless you also wished to protect them from possible damage--- you could just buy a piece of 1/8" plate glass and rig a way to shoot thru it, tilt it a bit and elimnate the possiblity of a kick or ghost.
Bill Turner
Century Division
Schneider Optics
Re: Welding
Depends on how close you go... protect yr lenses and cam for hot parts, use an UV filter. If needed for reducing exposure, never set for high shutterspeeds, but rather apply ND filters. If, under these conditions you don't get strong vertical streaking, there is no risk for the CCD.
Depends on how close you go... protect yr lenses and cam for hot parts, use an UV filter. If needed for reducing exposure, never set for high shutterspeeds, but rather apply ND filters. If, under these conditions you don't get strong vertical streaking, there is no risk for the CCD.
HansK
Veteran
Re: Welding
Well, the manual instructs not to point the lens or viewfinder at the sun. A point source of light from a welder is going to be hotter than the sun. You may damage your camera. That's why welders wear extremely dark goggles. Can't see anything through them until the welding starts.
Do you require the shot to have the weld spot? Or just the sparks and flashes and act of welding? Then that makes it easier since you may block the hot spot and use ND filters (internal or external).
Also, take heed to the earlier advice about sparks expelled during the welding. Those hot little mothers will travel farther than they are visible. It's no fun having one drop onto your skin. Imagine what one might do to your camera.
Well, the manual instructs not to point the lens or viewfinder at the sun. A point source of light from a welder is going to be hotter than the sun. You may damage your camera. That's why welders wear extremely dark goggles. Can't see anything through them until the welding starts.
Do you require the shot to have the weld spot? Or just the sparks and flashes and act of welding? Then that makes it easier since you may block the hot spot and use ND filters (internal or external).
Also, take heed to the earlier advice about sparks expelled during the welding. Those hot little mothers will travel farther than they are visible. It's no fun having one drop onto your skin. Imagine what one might do to your camera.
sojrn
Well-known member
Re: Welding
For instructional/training projects where you need to focus on the weld puddle for long amounts of time:
I would suggest using the same types lenses welders use. The best for filmimg is the auto darkening lens which darkens within 1/100 of a second of the arc flash and then lightens when you stop welding. This type of lens will enable you to see through the camera lens for focus, etc. than if you tried to use one of the old static types.
For narrative filming:
Take some of the suggestions above regarding the use of ND filters. You would only have to establish the welding for a few seconds then cut away to your narrative.
For instructional/training projects where you need to focus on the weld puddle for long amounts of time:
I would suggest using the same types lenses welders use. The best for filmimg is the auto darkening lens which darkens within 1/100 of a second of the arc flash and then lightens when you stop welding. This type of lens will enable you to see through the camera lens for focus, etc. than if you tried to use one of the old static types.
For narrative filming:
Take some of the suggestions above regarding the use of ND filters. You would only have to establish the welding for a few seconds then cut away to your narrative.
Re: Welding
Hans, welders light isn't "hotter" than the sun, but orders of magnitude lower in energy level unless you go real close. Just take a large magnifying glass and, on a suny day, focus the sun on your skin and feel how fast you will get burned. Take the some magnifier glass and focus the welders lightsource on yr skin and feel how long it will take before you will feel some warming up. That's exactly the difference that yr CCD would "feel". FYI there are two mechanisms by which a semiconductor cam gets deteriorated heat and UV. Not the CCD but the IR blocking filter and/or the mozaik filter in single CCD cams get damaged.
Hans, welders light isn't "hotter" than the sun, but orders of magnitude lower in energy level unless you go real close. Just take a large magnifying glass and, on a suny day, focus the sun on your skin and feel how fast you will get burned. Take the some magnifier glass and focus the welders lightsource on yr skin and feel how long it will take before you will feel some warming up. That's exactly the difference that yr CCD would "feel". FYI there are two mechanisms by which a semiconductor cam gets deteriorated heat and UV. Not the CCD but the IR blocking filter and/or the mozaik filter in single CCD cams get damaged.