Kyle Mallory
Well-known member
- Joined
- Jan 18, 2007
- Messages
- 620
- Reaction score
- 0
- Points
- 0
- Age
- 54
- Location
- Salt Lake City
- Website
- www.ifastudios.com
I hope people read this thread here, rather than in the Lens Tests...
I just installed the Birger mount, etc and have working lens data. But I've got a couple of minor concerns, and am wondering if others have seen this before.
First, I have a Canon 16-35mm 2.8L lens, as well as a cheap Canon 70-200mm 2.8-5.6. When I mount both of these, neither initializes automatically, instead I have to press and hold the middle button to initialize. Once the initialization has started, the focus range moves very quickly to one end of the range, but very slowly to the other end. It does this twice. It take approximately 15-20 seconds to initialize a lens. Both of my lenses do the same thing. I haven't personally tried with other lenses, but my camera went out on a job (with the mount) just last week. No one reported any problems... either they assumed it was "normal behaviour", or it performed as expected. I hope to try other lenses soon, but I found it odd that both of my lenses do the same thing.
Second, I have complete lens data for Iris, Focal Length, and Focal Distance. During the initialization, the Focal Distance updates as it moves through the focus range on the lens. Once the initialization is finished, and the lens returns to the mid-point, the focal length updates to the new position. However, any manual adjustment of focus after initialization does not update the lens data. Lens data updates for Aperture and Focal Length just fine.
Anyone have any experience with either of these issues?
I just installed the Birger mount, etc and have working lens data. But I've got a couple of minor concerns, and am wondering if others have seen this before.
First, I have a Canon 16-35mm 2.8L lens, as well as a cheap Canon 70-200mm 2.8-5.6. When I mount both of these, neither initializes automatically, instead I have to press and hold the middle button to initialize. Once the initialization has started, the focus range moves very quickly to one end of the range, but very slowly to the other end. It does this twice. It take approximately 15-20 seconds to initialize a lens. Both of my lenses do the same thing. I haven't personally tried with other lenses, but my camera went out on a job (with the mount) just last week. No one reported any problems... either they assumed it was "normal behaviour", or it performed as expected. I hope to try other lenses soon, but I found it odd that both of my lenses do the same thing.
Second, I have complete lens data for Iris, Focal Length, and Focal Distance. During the initialization, the Focal Distance updates as it moves through the focus range on the lens. Once the initialization is finished, and the lens returns to the mid-point, the focal length updates to the new position. However, any manual adjustment of focus after initialization does not update the lens data. Lens data updates for Aperture and Focal Length just fine.
Anyone have any experience with either of these issues?
