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kevinschoenmakers · 11-12-2009, 08:42 PM

Originally posted by elkarrde

i wonder from where does OS draws power for its gyro-sensor and lens stabilization parts - probably from PowerZoom/SDM contacts, that's the only reasonable place with enough current.

That's unlikely given that Sigma tells you to use the OS on the models without IS (see a few posts back). But those models also lack SDM.

thibs · 11-13-2009, 02:03 AM

Originally posted by kevinschoenmakers

That's unlikely given that Sigma tells you to use the OS on the models without IS (see a few posts back). But those models also lack SDM.

Power comes from SDM/PZ contacts.
In theory, OS should work with Z/MZ-serie bodies

ixian · 11-13-2009, 03:54 AM

Originally posted by HermanLee

We can only choose one or the other, NOT both.
Here is the quote from Sigma Japan website:

Fair enough. Not the first time when Sigma UK is... not very well informed?

Still, some serious real life tests would be interesting.

ixian · 11-13-2009, 03:58 AM

Originally posted by thibs

Power comes from SDM/PZ contacts.
In theory, OS should work with Z/MZ-serie bodies

So... is there enough power available for both OS and HSM? Maybe that's why HSM lenses, like 120-400mm, come without OS in Pentax mount?

thibs · 11-13-2009, 08:24 AM

Originally posted by ixian

So... is there enough power available for both OS and HSM? Maybe that's why HSM lenses, like 120-400mm, come without OS in Pentax mount?

Yes ther's enough, reason why Sigma's 18-250 is OS and HSM in Pentax mount.
Technicaly, nothing prevent it.

There may be too little current to move bigger glass but that needs to be proven.

reeftool · 11-13-2009, 09:54 AM

I have read some opinions that having shake reduction in the lens works a little better with a long telephoto lens than in the body SR. Whether that's true or not remains to be seen. I suspect that Sigma's reasons for this are a little more selfish. They only have to manufacture one lens instead of the OS and the non OS lenses. The good side will be that most of their new lenses will be available for all DSLR's. All they need to concern themselves is the mount. The down side is that we now will have to pay the extra dollars for an image stabilized lens that we really don't need. Look at the difference in price. The 70-300 is usually available for $129 and the APO is $199. The price on the OS is triple that. I'll bet the optics are the same.

robjmitchell · 11-13-2009, 10:55 AM

Considering how good the pentax 55-300 is for the price, who would buy one of these new sigmas?

thibs · 11-13-2009, 11:12 AM

Originally posted by reeftool

I have read some opinions that having shake reduction in the lens works a little better with a long telephoto lens than in the body SR. .

Well, OS has the advantage that you see the result in the viewfinder. I don't care but I understand some might.

**RuiC** · 11-13-2009, 11:52 AM

Originally posted by reeftool

I have read some opinions that having shake reduction in the lens works a little better with a long telephoto lens than in the body SR. Whether that's true or not remains to be seen. .........

That is the point. As Thibs has already said in the post above, you can actually see the image stabilized mainly at the 300mm end, with SR you know the image will be saved stabilized but you have difficulty to frame it because of hand shake. With OS you see it more stable hence more confortable. edit: The longer the FL the more useful it turns.

Rui

koper · 11-13-2009, 12:35 PM

image stabilized lens in the future will be HSM lenses
it allow faster focus
i have Sigma 18- 250mm F/3.5-6.3 DC OS HSM
When the OS function of lens body is used, i turn the stabilizer function of camera body off.

thibs · 11-13-2009, 01:45 PM

BTW koper, what do you think of this lens?
How about HSM? OS? optical qualities?

reeftool · 11-13-2009, 10:42 PM

Originally posted by thibs

Well, OS has the advantage that you see the result in the viewfinder. I don't care but I understand some might.

Does anybody really think that seeing the SR result in the viewfinder is worth an extra $300? The estimated street price I read was $599. Canon and Nikon have their own IS lenses in that size range selling for less.

koper · 11-13-2009, 11:32 PM

Sigma 18- 250mm F/3.5-6.3 DC OS HSM are good lenses
i find it better and more fast focus than pentax 18- 250mm lenses
i dose not have the aperture like Pentax-DA* 60-250 F4 SDM
fore daily photography i am very satisfied

thibs · 11-14-2009, 01:53 AM

Thank you, Koper.

Class A · 11-14-2009, 03:54 PM

Originally posted by ogl

K-7's results are better than only with SR ON.

I don't trust that test you quoted one single bit.

Originally posted by Supernaut

that test result is speaking against the physics behind SR so I don't belive it until a trusted person like Falconeye tries it.

+1

Originally posted by Supernaut

This is in the "the world is flat" class. A web page claming it to be flat don't do it for me.

+1

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11-12-2009, 08:42 PM	#16
kevinschoenmakers Veteran Member Join Date: Mar 2009 Location: Shanghai Photos: Gallery Posts: 1,509 Original Poster	Originally posted by elkarrde i wonder from where does OS draws power for its gyro-sensor and lens stabilization parts - probably from PowerZoom/SDM contacts, that's the only reasonable place with enough current. That's unlikely given that Sigma tells you to use the OS on the models without IS (see a few posts back). But those models also lack SDM.

11-13-2009, 02:03 AM	#17
thibs Pentaxian Join Date: Jun 2007 Location: Belgium Photos: Albums Posts: 7,001	Originally posted by kevinschoenmakers That's unlikely given that Sigma tells you to use the OS on the models without IS (see a few posts back). But those models also lack SDM. Power comes from SDM/PZ contacts. In theory, OS should work with Z/MZ-serie bodies

11-13-2009, 03:54 AM	#18
ixian Senior Member Join Date: Jul 2008 Location: Warwickshire, UK Photos: Albums Posts: 193	Originally posted by HermanLee We can only choose one or the other, NOT both. Here is the quote from Sigma Japan website: Fair enough. Not the first time when Sigma UK is... not very well informed? Still, some serious real life tests would be interesting.

11-13-2009, 03:58 AM	#19
ixian Senior Member Join Date: Jul 2008 Location: Warwickshire, UK Photos: Albums Posts: 193	Originally posted by thibs Power comes from SDM/PZ contacts. In theory, OS should work with Z/MZ-serie bodies So... is there enough power available for both OS and HSM? Maybe that's why HSM lenses, like 120-400mm, come without OS in Pentax mount?

11-13-2009, 08:24 AM	#20
thibs Pentaxian Join Date: Jun 2007 Location: Belgium Photos: Albums Posts: 7,001	Originally posted by ixian So... is there enough power available for both OS and HSM? Maybe that's why HSM lenses, like 120-400mm, come without OS in Pentax mount? Yes ther's enough, reason why Sigma's 18-250 is OS and HSM in Pentax mount. Technicaly, nothing prevent it. There may be too little current to move bigger glass but that needs to be proven.

11-13-2009, 09:54 AM	#21
reeftool Pentaxian Join Date: Dec 2007 Location: Upstate New York Photos: Gallery \| Albums Posts: 9,555	I have read some opinions that having shake reduction in the lens works a little better with a long telephoto lens than in the body SR. Whether that's true or not remains to be seen. I suspect that Sigma's reasons for this are a little more selfish. They only have to manufacture one lens instead of the OS and the non OS lenses. The good side will be that most of their new lenses will be available for all DSLR's. All they need to concern themselves is the mount. The down side is that we now will have to pay the extra dollars for an image stabilized lens that we really don't need. Look at the difference in price. The 70-300 is usually available for $129 and the APO is $199. The price on the OS is triple that. I'll bet the optics are the same.

11-13-2009, 10:55 AM	#22
robjmitchell Veteran Member Join Date: Oct 2007 Location: Melbourne Aus Posts: 1,776	Considering how good the pentax 55-300 is for the price, who would buy one of these new sigmas?

11-13-2009, 11:12 AM	#23
thibs Pentaxian Join Date: Jun 2007 Location: Belgium Photos: Albums Posts: 7,001	Originally posted by reeftool I have read some opinions that having shake reduction in the lens works a little better with a long telephoto lens than in the body SR. . Well, OS has the advantage that you see the result in the viewfinder. I don't care but I understand some might.

11-13-2009, 11:52 AM	#24
RuiC Site Supporter Join Date: Jan 2009 Location: Lisboa - The best destination in Europe Posts: 633	Originally posted by reeftool I have read some opinions that having shake reduction in the lens works a little better with a long telephoto lens than in the body SR. Whether that's true or not remains to be seen. ......... That is the point. As Thibs has already said in the post above, you can actually see the image stabilized mainly at the 300mm end, with SR you know the image will be saved stabilized but you have difficulty to frame it because of hand shake. With OS you see it more stable hence more confortable. edit: The longer the FL the more useful it turns. Rui

11-13-2009, 12:35 PM	#25
koper Senior Member Join Date: Jul 2008 Location: israel Photos: Gallery Posts: 180	image stabilized lens in the future will be HSM lenses it allow faster focus i have Sigma 18- 250mm F/3.5-6.3 DC OS HSM When the OS function of lens body is used, i turn the stabilizer function of camera body off.

11-13-2009, 01:45 PM	#26
thibs Pentaxian Join Date: Jun 2007 Location: Belgium Photos: Albums Posts: 7,001	BTW koper, what do you think of this lens? How about HSM? OS? optical qualities?

11-13-2009, 10:42 PM	#27
reeftool Pentaxian Join Date: Dec 2007 Location: Upstate New York Photos: Gallery \| Albums Posts: 9,555	Originally posted by thibs Well, OS has the advantage that you see the result in the viewfinder. I don't care but I understand some might. Does anybody really think that seeing the SR result in the viewfinder is worth an extra $300? The estimated street price I read was $599. Canon and Nikon have their own IS lenses in that size range selling for less.

11-13-2009, 11:32 PM	#28
koper Senior Member Join Date: Jul 2008 Location: israel Photos: Gallery Posts: 180	Sigma 18- 250mm F/3.5-6.3 DC OS HSM are good lenses i find it better and more fast focus than pentax 18- 250mm lenses i dose not have the aperture like Pentax-DA* 60-250 F4 SDM fore daily photography i am very satisfied

11-14-2009, 01:53 AM	#29
thibs Pentaxian Join Date: Jun 2007 Location: Belgium Photos: Albums Posts: 7,001	Thank you, Koper.

11-14-2009, 03:54 PM	#30
Class A Pentaxian Join Date: Aug 2008 Location: Wellington, New Zealand Posts: 11,251	Originally posted by ogl K-7's results are better than only with SR ON. I don't trust that test you quoted one single bit. Originally posted by Supernaut that test result is speaking against the physics behind SR so I don't belive it until a trusted person like Falconeye tries it. +1 Originally posted by Supernaut This is in the "the world is flat" class. A web page claming it to be flat don't do it for me. +1

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