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Comment by FredEriksson posted on SDM issues? A straw poll. at 01/10/2009 - 10:40
The scene was full of contrast and the lens started focusing and the scene was pretty much in focus but the focus never settled. And, the AF mode was NOT AF.C I might add.
/F
/F
Anvh wrote:
the AF sensor also needs contrast, it will for example not lock on the blank walls here, might that have been the problem?
I also found that it helps when you manually put the focus nearly correct, it mostly snap on instantly.
the AF sensor also needs contrast, it will for example not lock on the blank walls here, might that have been the problem?
I also found that it helps when you manually put the focus nearly correct, it mostly snap on instantly.
Comment by FredEriksson posted on SDM issues? A straw poll. at 01/10/2009 - 10:20
LOL, I just went and continued to use "haunting" and in the same sentence where I mention "when there is not enough light"! Ghost do come out when it's dark, right?
Anvh wrote:
That's what you get when your are dyslectic and English is not your first language.
I sometimes do think the camera/lens has a mind of his own though and in such it might have a ghost (soul)
Hunting is the word we are looking for.
loskeran wrote:
Quote:
As for your problem, it's quite normal and it's called haunting.
I love that one, a Ghost in the lens, I've heard of Gremlins before.As for your problem, it's quite normal and it's called haunting.
That's what you get when your are dyslectic and English is not your first language.
I sometimes do think the camera/lens has a mind of his own though and in such it might have a ghost (soul)
Hunting is the word we are looking for.
Comment by FredEriksson posted on SDM issues? A straw poll. at 01/10/2009 - 10:15
Thanks for your reply, Stefan. I know of haunting, especially when there is not enough light, but what I tried to describe is not that I believe. Basically what happened was that there was scene with lots of daylight and stuff and it should focus with no problems, but it never settled and I could hear the lens' AF motor go back and forth in quick tiny repetive movements like it's stuck in a machine gun-like infinite loop. If it did try to refocus itself I'm sure it would be able to find focus again but I need to give it a nudge by refocussing on something else first and then try again. It's not really a huge problem if it doesn't escalate and I'm not too worried.
Anvh wrote:
Fred that is an auto focus failure not a SDM one, SDM is simply the motor that drives the focus system of the lens, nothing more nothing less.
As for your problem, it's quite normal and it's called haunting.
The AF sensor needs contrast to see if the focus is "sharp" or not and it does not like low light since contrast will drop as well and it reads the light that reflects from the subject.
It simply is not able to see sometimes so it will miss the focus.
Fred that is an auto focus failure not a SDM one, SDM is simply the motor that drives the focus system of the lens, nothing more nothing less.
As for your problem, it's quite normal and it's called haunting.
The AF sensor needs contrast to see if the focus is "sharp" or not and it does not like low light since contrast will drop as well and it reads the light that reflects from the subject.
It simply is not able to see sometimes so it will miss the focus.
Comment by FredEriksson posted on SDM issues? A straw poll. at 01/10/2009 - 10:04
I have the 50-135 since 2 months and I voted no. However, on rare occasions the lens has not been able to find focus – the AF never settles and just moves backwards and forwards a small distance. It has only happened 2-3 times and can be fixed by refocussing on something closer and then just try again. I wouldn't call it an SDM failure. Still, if this is a sign of something worse to come maybe I'll change my opinion. All in all, it's a lovely lens and I'm very happy with IQ it generates.
Cheers,
/Fred
Cheers,
/Fred
Comment by FredEriksson posted on SDM issues? A straw poll. at 01/10/2009 - 09:33
aminstar wrote:
Can I also please clarify to the interested ones please that I would really prefer to post them all to you rather than arranging for collection. Fred, I will be meeting my friend where he lives to collect the goods, so its not exactly Heathrow where I will be meeting him. And usually its very difficult for me to give a time to be at home to organise for collection so as I will be posting to most of them I would rather just post all of them instead of picking and leaving behind any for collection as you will appreciate it will mess up with my schedules.
So please let me know if still interested as I am prepared to post rather than having to arrange a meeting for collection.
When I get the lenses in my hands then we can organise payment, bank or paypal will do for me.
Please let me know if this is still ok for the ones in the list please.
Thanks
Amin, that's great. Whatever suits you I'm happy with. So yes, I'm still very much interested.FredEriksson wrote:
Hi,
If possible could I please be added too. I live in Ashford close to Heathrow and could pick up and pay easily.
Thanks a lot,
/Fred
Fred, I am happy to include you in the list.Hi,
If possible could I please be added too. I live in Ashford close to Heathrow and could pick up and pay easily.
Thanks a lot,
/Fred
Can I also please clarify to the interested ones please that I would really prefer to post them all to you rather than arranging for collection. Fred, I will be meeting my friend where he lives to collect the goods, so its not exactly Heathrow where I will be meeting him. And usually its very difficult for me to give a time to be at home to organise for collection so as I will be posting to most of them I would rather just post all of them instead of picking and leaving behind any for collection as you will appreciate it will mess up with my schedules.
So please let me know if still interested as I am prepared to post rather than having to arrange a meeting for collection.
When I get the lenses in my hands then we can organise payment, bank or paypal will do for me.
Please let me know if this is still ok for the ones in the list please.
Thanks
/Fred
Comment by FredEriksson posted on Samsung 12-24mm F4 at 13/07/2009 - 15:36
Hi,
If possible could I please be added too. I live in Ashford close to Heathrow and could pick up and pay easily.
Thanks a lot,
/Fred
If possible could I please be added too. I live in Ashford close to Heathrow and could pick up and pay easily.
Thanks a lot,
/Fred
Comment by FredEriksson posted on Samsung 12-24mm F4 at 13/07/2009 - 15:20
/F
Very strange Fred, hopefully it isn't much of a problem.