All Forum Comments
ChrisA wrote:
Apologies for the lack of research before asking this...
... but is it possible to force an SDM lens that can use the body's screw drive on a non-SDM-enabled body, to use the screw drive on an SDM-enabled body?
There are now two types of K mounts that use a SDM motor the KAF2 and KAF3. The KAF2 also has a screwdrive but KAF is SDM only so won't autofocus on non SDM cameras.Apologies for the lack of research before asking this...
... but is it possible to force an SDM lens that can use the body's screw drive on a non-SDM-enabled body, to use the screw drive on an SDM-enabled body?
As for enabling KAF2 lenses to use screwdriver the answer is no.
The lens has a digital contact with his ID and info what the lens can, if the camera knows it has a SDM it will use that.
You might disable the digital-info contact but with that you will also lose the ability to autofocus since the AF lenses also has a Digital-info contact that gives the info it can autofocus.
It's a software thing so they could make an option in the menu maybe?
Did I now explain it too much or not?
Martin always blame me that I give too much information.
George Lazarette wrote:
Do those Canon and Nikon lenses that use "ring" motors offer the ability to focus with non-USM enabled bodies?
Neither does Pentax with the KAF3 mount and they have said that designing KAF2 is too expensive, complex and that KAF3 lenses can be make smaller and lighter.Do those Canon and Nikon lenses that use "ring" motors offer the ability to focus with non-USM enabled bodies?
So further DA* will probable not AF on non-SDM bodies.
ps. Sorry George, thought I had the right word (whining) ^^;
Comment by Anvh posted on SDM Lenses at 03/10/2009 - 20:10
But a Bamboo is a good tablet, it just doesn't have the pro specs as the Intuos and it does not detect the angle of your pen but that's only really needed when you draw on your tablet, for photoediting a bamboo is good enough.
Although you might be able to get an Intuos 3 for a good price since they are replaced by the Intuos 4.
Just be aware of tablets of other brands, they are just a bit less and need batteries to operate.
Although you might be able to get an Intuos 3 for a good price since they are replaced by the Intuos 4.
Just be aware of tablets of other brands, they are just a bit less and need batteries to operate.
Comment by Anvh posted on Tablet, do you use one? at 03/10/2009 - 19:50
George you're the one whining now
It's not about that we need faster AF it's just that it has potential to go faster.
Another thought, what's the life time of an USM motor?
It's a motor so it will wear out, right?
It's not about that we need faster AF it's just that it has potential to go faster.
Another thought, what's the life time of an USM motor?
It's a motor so it will wear out, right?
Comment by Anvh posted on SDM Lenses at 03/10/2009 - 14:31
Arther, I agree on that.
They need to improve that quite a lot.
Although I don't know if the lens is fully to blame since every SDM lens is focusing faster with every new generation camera coming strangely enough...
Maybe Pentax are deliberately keeping them slow???
They need to improve that quite a lot.
Although I don't know if the lens is fully to blame since every SDM lens is focusing faster with every new generation camera coming strangely enough...
Maybe Pentax are deliberately keeping them slow???
Comment by Anvh posted on SDM Lenses at 03/10/2009 - 10:50
aminstar wrote:
Stefan
I think Richard meant to correct my (ultrasonic) term added in the line where I explained what SDM stood for. I just copied that from another forum and obviously seems wrong.
What I should have put there after the SDM explanation was (significantly faster and operate more quietly than conventionally driven AF lenses.
Ahhh the joys of learning .
Yes I know Amin but what you stated was right though, only the fast part they are lacking with though Stefan
I think Richard meant to correct my (ultrasonic) term added in the line where I explained what SDM stood for. I just copied that from another forum and obviously seems wrong.
What I should have put there after the SDM explanation was (significantly faster and operate more quietly than conventionally driven AF lenses.
Ahhh the joys of learning .
Here see this link
Comment by Anvh posted on SDM Lenses at 03/10/2009 - 10:36
loskeran wrote:
USM they are not, (Ultra sonic motors) Canons "ring motors" very fast, the same as Sigma’s HSM, "Hyper sonic motors"
SDM, as I understand it is for "Silent drive motor" a micro motor similar to the Tamron version, the only very fast drives at the moment are of the ring type.
And yes you also require very fast AF to go with it, i.e. the newest Canon version on their 7D, so Pentax does have to make lots of improvements yet.
If Pentax say it's Supersonic Direct-drive Motor then it's Supersonic Direct-drive Motor linkQuote:
Chris, SDM means Super Direct-drive Motor (ultrasonic autofocus)
Its supposed to be fast and silent when focusing at least on the digital bodies.
May I pick you up on two things Amin,Chris, SDM means Super Direct-drive Motor (ultrasonic autofocus)
Its supposed to be fast and silent when focusing at least on the digital bodies.
USM they are not, (Ultra sonic motors) Canons "ring motors" very fast, the same as Sigma’s HSM, "Hyper sonic motors"
SDM, as I understand it is for "Silent drive motor" a micro motor similar to the Tamron version, the only very fast drives at the moment are of the ring type.
And yes you also require very fast AF to go with it, i.e. the newest Canon version on their 7D, so Pentax does have to make lots of improvements yet.
Quote:
SDM
(Supersonic Direct-drive Motor) Small motors manage the actual focusing of an autofocus system. With the “Supersonic Direct-drive Motor” PENTAX has developed a technology that propels the focusing procedure with an ultrasonic motor. PENTAX SDM lenses drive the autofocus system significantly faster and operate more quietly than conventionally driven AF lenses.
Ultrasonic motor is a type of motor that vibrates and that vibrations is turn into motion. linkSDM
(Supersonic Direct-drive Motor) Small motors manage the actual focusing of an autofocus system. With the “Supersonic Direct-drive Motor” PENTAX has developed a technology that propels the focusing procedure with an ultrasonic motor. PENTAX SDM lenses drive the autofocus system significantly faster and operate more quietly than conventionally driven AF lenses.
Canon use three kind of USM motors, and the micro type is the same as Pentax use as stated above correctly.
Comment by Anvh posted on SDM Lenses at 03/10/2009 - 10:29
Congratulations it's an amazing shot.
Comment by Anvh posted on PPG loves me again. at 02/10/2009 - 22:40
Everything on the sensor (lens) will become visible then.
The high f-number insures that the light that falls on the sensor is perpendicular to it, so dust or anything else will block the light and will show up.
The high f-number insures that the light that falls on the sensor is perpendicular to it, so dust or anything else will block the light and will show up.
Comment by Anvh posted on Inspection after sensor cleaning? at 02/10/2009 - 22:17
I find that ballhead also work very good on a monopod.
I leave them half open so that they give some friction but are still adjustable easily.
Although I have a normal ballhead (gitzo for got the number) I would advise getting a off centre ballhead like this one link
It might seem a bit weird but the height of a monopod is important and the camera sits on the head but when you go to portrait mode it's next to the head so I find the monopod too low then. I'm also a person that switch a lot between the two and a off centre head will keep the camera roughly at the same height.
GH3750QR looks very good since it can carry 8kg but it cost £ 153.00 though.
ps. I'm not the only one with this problem right?
I leave them half open so that they give some friction but are still adjustable easily.
Although I have a normal ballhead (gitzo for got the number) I would advise getting a off centre ballhead like this one link
It might seem a bit weird but the height of a monopod is important and the camera sits on the head but when you go to portrait mode it's next to the head so I find the monopod too low then. I'm also a person that switch a lot between the two and a off centre head will keep the camera roughly at the same height.
GH3750QR looks very good since it can carry 8kg but it cost £ 153.00 though.
ps. I'm not the only one with this problem right?
Comment by Anvh posted on Monopod Head at 02/10/2009 - 22:10
the post was just me saying hi and saying my girlfriend has bought me a km twin lens kit for my birthday
link