|
|
Rank: New Member
Groups: Member
Joined: 7/29/2009
Posts: 3
Points: 9
Location: Argentina
|
I'm from Argentina. I would like to ask you about a litte trouble I have with the combo 5D and a recently purchased Leitz Summicron R 90/2 .
Using the 5D in Av, the camera overexpose 1/2 stop for every stop over f/4 (cumulative).
Using a hand light meter and the camera in M all pictures are OK in all stops.
The camera with Canon lenses, obviously, is OK too.
Have you experienced a similar problem?
Any idea?
Thanks you very much in advance, and sorry for my english
José María Farfaglia
Argentina
|
|
|
|
|
|
Rank: Administration
Groups: Administration
Joined: 1/31/2008
Posts: 193
Points: 676
Location: Dallas, Texas
|
Are you using an adapter w/ a focus confirmation chip? If so, was the ROM chip coded at 90mm and F2? I believe this occurs on adapters without the ROM chip, but it's been a long, long time since I last used a 5D, so I can't remember for sure.
|
|
Rank: New Member
Groups: Member
Joined: 7/29/2009
Posts: 3
Points: 9
Location: Argentina
|
PebblePlace wrote:Are you using an adapter w/ a focus confirmation chip? If so, was the ROM chip coded at 90mm and F2? I believe this occurs on adapters without the ROM chip, but it's been a long, long time since I last used a 5D, so I can't remember for sure. Yes, I'm using an adapter with a focus confirmation chip.
|
|
Rank: Administration
Groups: Administration
Joined: 1/31/2008
Posts: 193
Points: 676
Location: Dallas, Texas
|
I've had this problem before with both the 40D and 5D; I never resolved it, the cameras were just sold. On the 1-series I've never had this issue, so it's something about how the 5D & 40D meter. You're probably best off posting your question on http://www.fredmiranda.com/forum/board/55 because there are 100's 5D users there with manual lenses. Surely somebody has figured this out.
With regards to the 90mm Summicron, I've noticed that both the 90mm APO and the prior non-APO version on the Leica M8 (note M, not R) both over-exposed by 2/3 of stop. Those 90mm's seemed more likely clip highlights than my other Leica lenses. I only mention this because maybe there are two issues at work - one being the adapter, and maybe a second that the 90mm lens tend to overexpose by design (ie - how they handle specular highlights). Just a thought.
|
|
Rank: New Member
Groups: Member
Joined: 7/29/2009
Posts: 3
Points: 9
Location: Argentina
|
PebblePlace wrote:I've had this problem before with both the 40D and 5D; I never resolved it, the cameras were just sold. On the 1-series I've never had this issue, so it's something about how the 5D & 40D meter. You're probably best off posting your question on http://www.fredmiranda.com/forum/board/55 because there are 100's 5D users there with manual lenses. Surely somebody has figured this out.
With regards to the 90mm Summicron, I've noticed that both the 90mm APO and the prior non-APO version on the Leica M8 (note M, not R) both over-exposed by 2/3 of stop. Those 90mm's seemed more likely clip highlights than my other Leica lenses. I only mention this because maybe there are two issues at work - one being the adapter, and maybe a second that the 90mm lens tend to overexpose by design (ie - how they handle specular highlights). Just a thought. Thank you very much.
|
|
Rank: Member
Groups: Member
Joined: 1/24/2009
Posts: 10
Points: 30
Location: HK
|
My experience is that it is the fundamental 5-series metering "characteristics". If you adapt lenses from any other brands, it happens.
My experience is that when apertures slower than max. one are used, this issue will happen. Also the slower the aperture, the worse the issue.
For example, for my 100/2.8AM, when f2.8 is used, it has no problem, when f4 is used, it is about less than 1/3 stop overexposed, when f5.6 is used, 2/3 stop overexposed. When f8 is used, it is 1-stop overexposed...etc, etc.
Similar situation happens for 180/2.8APO and 280/4APO.
The only way to resolve is that if your adapter is the optix v5 one, change the max. aperture though it will be cumbersome. For me, I seldom change the aperture as I always want to use the sweet spot(aperture) of each of the Leica lenses.
Cheers
|
|
|
Guest |
