david farland
Well-known member
What resolution charts would you use?
What are the key resolution tests to perform if buying/hiring?
Help.....Dave,
What are the key resolution tests to perform if buying/hiring?
Help.....Dave,
Welcome to our community
Be a part of something great, join today!
General Lens testing
- Thread starter david farland
- Start date
Matthew Duclos
Well-known member
- Joined
- Feb 29, 2008
- Messages
- 915
- Reaction score
- 0
- Points
- 0
- Location
- Chatsworth, CA
- Website
- www.ducloslenses.com
A true test would be done on a collimator and a projector.
There are too many variables to test on a camera.
Indeed, a test should be performed on the prospective camera, but this should be the last step (in my opinion).
Im sure there are many others that will chime in on this subject.
There are too many variables to test on a camera.
Indeed, a test should be performed on the prospective camera, but this should be the last step (in my opinion).
Im sure there are many others that will chime in on this subject.
M.Halsell
Well-known member
Can still lens be collimated or is it just for cine lenses?
Matthew Duclos
Well-known member
- Joined
- Feb 29, 2008
- Messages
- 915
- Reaction score
- 0
- Points
- 0
- Location
- Chatsworth, CA
- Website
- www.ducloslenses.com
All glass can and should be adjusted properly.
Jason Sinclair
Well-known member
Does this help ?
- Thread starter
- #6
david farland
Well-known member
Babu Kantamneni
Well-known member
- Joined
- Jan 5, 2007
- Messages
- 317
- Reaction score
- 0
- Points
- 0
Now.This is a clear communication (Talking Turkey!)
- Banned
- #8
Nova Invicta
Banned
- Joined
- Nov 1, 2007
- Messages
- 132
- Reaction score
- 0
- Points
- 0
Lens Testing
Lens Testing
For a complete lens test the following would be performed at major rental houses. MTF test on axis (if a problem is noticed you may go on to test at five points off axis & centrally) , projection here you would check for distortion, color fringing and distance scales, T stop machine to verify stops are correctly marked up. collumation on camera, eye focus on camera (both after checking focal depth of camera as part of the camera check)
So in short we would check the camera independently, check the lenses independently, then check the lenses on camera. In shooting lens tests simply shooting charts is not enough we would shoot interiors and exteriors generally using the same external surfaces (brickwork, vertical or horizontal lines etc)
We also check lenses at extreme tempretures this is where quite often the differences between stills & cinematography lenses really shows up. Equally stills lenses are often harder to correct if a fault is found than professional cinematography lenses. The guys that test these lenses have been doing so for many years and get to know what is or is not acceptable without compromise because they are not owner / operators and are seeking optimum performance.
Lens Testing
For a complete lens test the following would be performed at major rental houses. MTF test on axis (if a problem is noticed you may go on to test at five points off axis & centrally) , projection here you would check for distortion, color fringing and distance scales, T stop machine to verify stops are correctly marked up. collumation on camera, eye focus on camera (both after checking focal depth of camera as part of the camera check)
So in short we would check the camera independently, check the lenses independently, then check the lenses on camera. In shooting lens tests simply shooting charts is not enough we would shoot interiors and exteriors generally using the same external surfaces (brickwork, vertical or horizontal lines etc)
We also check lenses at extreme tempretures this is where quite often the differences between stills & cinematography lenses really shows up. Equally stills lenses are often harder to correct if a fault is found than professional cinematography lenses. The guys that test these lenses have been doing so for many years and get to know what is or is not acceptable without compromise because they are not owner / operators and are seeking optimum performance.