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sportster64 · 10-08-2007, 09:07 AM

I have a 200MM manual prime lens I am using with my K100D. I want to use a 2x teleconverter with it. When the Shake Reduction menu comes up - do I choose 200mm or 400MM for SR since it is now the eqivilent of 400mm w/ the teleconv. ?

Secondly - what SR setting do you use if you have a variable manual zoom of say 100-300 ? I think you choose the highest zoom?? in this case 300 ?

r3nx · 10-08-2007, 09:52 AM

Set the amount that you are currantly using, In case of 2x + 200mm use 400mm.. When using a zoom lens, you still need to put the same focal lenght that you currently have the lens at.

volosong · 10-08-2007, 10:00 AM

Originally posted by r3nx

...When using a zoom lens, you still need to put the same focal lenght that you currently have the lens at.

With a zoom that transmit its focal length information to the body, is it still necessary to manually input the focal length? Or, does this only apply to K and M series zoom lenses?

matsoberg · 10-08-2007, 12:54 PM

Originally posted by volosong

With a zoom that transmit its focal length information to the body, is it still necessary to manually input the focal length? Or, does this only apply to K and M series zoom lenses?

From my experience in this, the -A series lenses are working like the K and M (and M42) lenses as well. The -A contacts in the lens only show the max aperture of the lens and not the focal length, I belive.

I had some trouble with my -A 35-105/3.5 before I finally used it without SR and got better (good) results.

Thank you,

// Mats

**Lowell Goudge** · 10-08-2007, 05:54 PM

For all those interested, KA lenses do not have the data contact that feeds focal length to the body. The camera, with any K or KA zoom attached prompt for focal length. Providing the teleconverter has electrical contacts KA lenses will still work for automatic metering, and P-TTL flash.

Also, on KAF lenses with an AF teleconverter, the camera gets the lens information through the AF converter BUT it does not compensate for focal length, and therefore for shake reduction gets it wrong.

This has been reported to pentax, and it has been suggested that there be an option for TC attached and the magnification factor be privided for in a menu 1.4x, 1.5x 1.7x, 2x, 3x, as the focal length is on present cameras

m8o · 10-08-2007, 07:58 PM

Originally posted by Lowell Goudge

Also, on KAF lenses with an AF teleconverter, the camera gets the lens information through the AF converter BUT it does not compensate for focal length, and therefore for shake reduction gets it wrong.

This has been reported to pentax, and it has been suggested that there be an option for TC attached and the magnification factor be privided for in a menu 1.4x, 1.5x 1.7x, 2x, 3x, as the focal length is on present cameras

Oh how I hope that can come to us via a firmware update...

I love to use a TC with my big long fast prime but it's real annoying I can't override the lens length; camera thinks I'm using 300mm even when I have my 2x TC on. Basically negates use of SR... a -big- reason I bought the K10D to begin with. :ugh:

When you say "it has been suggested", do you know how far 'into' the Pentax organization this idea may have made it?

Tom M · 10-09-2007, 06:54 AM

m80.. The rest of us who have that problem have done the following.. We have placed tape over the contact so the lens does NOT pass focal length data. Problem solved.

m8o · 10-09-2007, 07:43 AM

I had heard [read] about that but just passed over it. I'm a fool for leaving for my trip to Africa and not pursuing it more and doing that myself. Much thanx for the reminder!

**Lowell Goudge** · 10-09-2007, 09:08 AM

Originally posted by Tom M

m80.. The rest of us who have that problem have done the following.. We have placed tape over the contact so the lens does NOT pass focal length data. Problem solved.

Tom

Does this work, and is the tape conducting or insulating.

When I did some experiments with respect to changing lens mounts to convert from K to KA, I found that the camera wanted the data contact shorted to the lens mount, or you can not work in automatic apature mode.

How do the camera's automatic functions behave when you tape over the data contact?

10-08-2007, 09:07 AM	#1
sportster64 New Member Join Date: Oct 2007 Location: PA Posts: 2	Using Shake reduction w/Teleconverter I have a 200MM manual prime lens I am using with my K100D. I want to use a 2x teleconverter with it. When the Shake Reduction menu comes up - do I choose 200mm or 400MM for SR since it is now the eqivilent of 400mm w/ the teleconv. ? Secondly - what SR setting do you use if you have a variable manual zoom of say 100-300 ? I think you choose the highest zoom?? in this case 300 ?

10-09-2007, 07:43 AM	#8
m8o Veteran Member Join Date: Jul 2007 Location: 40°-55'-44" N / 73°-24'-07" W [on LI] Photos: Gallery \| Albums Posts: 3,092	I had heard [read] about that but just passed over it. I'm a fool for leaving for my trip to Africa and not pursuing it more and doing that myself. Much thanx for the reminder! Last edited by m8o; 10-09-2007 at 10:15 AM.

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10-08-2007, 09:52 AM	#2
r3nx Forum Member Join Date: Aug 2007 Location: Estonia Posts: 64	Set the amount that you are currantly using, In case of 2x + 200mm use 400mm.. When using a zoom lens, you still need to put the same focal lenght that you currently have the lens at.

10-08-2007, 10:00 AM	#3
volosong Veteran Member Join Date: Sep 2006 Location: North Idaho Photos: Gallery Posts: 696	Originally posted by r3nx ...When using a zoom lens, you still need to put the same focal lenght that you currently have the lens at. With a zoom that transmit its focal length information to the body, is it still necessary to manually input the focal length? Or, does this only apply to K and M series zoom lenses?

10-08-2007, 12:54 PM	#4
matsoberg Senior Member Join Date: Mar 2007 Location: Norrtälje Posts: 220	Originally posted by volosong With a zoom that transmit its focal length information to the body, is it still necessary to manually input the focal length? Or, does this only apply to K and M series zoom lenses? From my experience in this, the -A series lenses are working like the K and M (and M42) lenses as well. The -A contacts in the lens only show the max aperture of the lens and not the focal length, I belive. I had some trouble with my -A 35-105/3.5 before I finally used it without SR and got better (good) results. Thank you, // Mats

10-08-2007, 05:54 PM	#5
Lowell Goudge Site Supporter Join Date: Jan 2007 Location: Toronto Photos: Gallery \| Albums Posts: 17,892	For all those interested, KA lenses do not have the data contact that feeds focal length to the body. The camera, with any K or KA zoom attached prompt for focal length. Providing the teleconverter has electrical contacts KA lenses will still work for automatic metering, and P-TTL flash. Also, on KAF lenses with an AF teleconverter, the camera gets the lens information through the AF converter BUT it does not compensate for focal length, and therefore for shake reduction gets it wrong. This has been reported to pentax, and it has been suggested that there be an option for TC attached and the magnification factor be privided for in a menu 1.4x, 1.5x 1.7x, 2x, 3x, as the focal length is on present cameras

10-08-2007, 07:58 PM	#6
m8o Veteran Member Join Date: Jul 2007 Location: 40°-55'-44" N / 73°-24'-07" W [on LI] Photos: Gallery \| Albums Posts: 3,092	Originally posted by Lowell Goudge Also, on KAF lenses with an AF teleconverter, the camera gets the lens information through the AF converter BUT it does not compensate for focal length, and therefore for shake reduction gets it wrong. This has been reported to pentax, and it has been suggested that there be an option for TC attached and the magnification factor be privided for in a menu 1.4x, 1.5x 1.7x, 2x, 3x, as the focal length is on present cameras Oh how I hope that can come to us via a firmware update... I love to use a TC with my big long fast prime but it's real annoying I can't override the lens length; camera thinks I'm using 300mm even when I have my 2x TC on. Basically negates use of SR... a -big- reason I bought the K10D to begin with. :ugh: When you say "it has been suggested", do you know how far 'into' the Pentax organization this idea may have made it?

10-09-2007, 06:54 AM	#7
Tom M Veteran Member Join Date: Aug 2007 Location: Lincoln Park, NJ Photos: Gallery Posts: 780	m80.. The rest of us who have that problem have done the following.. We have placed tape over the contact so the lens does NOT pass focal length data. Problem solved.

10-09-2007, 09:08 AM	#9
Lowell Goudge Site Supporter Join Date: Jan 2007 Location: Toronto Photos: Gallery \| Albums Posts: 17,892	Originally posted by Tom M m80.. The rest of us who have that problem have done the following.. We have placed tape over the contact so the lens does NOT pass focal length data. Problem solved. Tom Does this work, and is the tape conducting or insulating. When I did some experiments with respect to changing lens mounts to convert from K to KA, I found that the camera wanted the data contact shorted to the lens mount, or you can not work in automatic apature mode. How do the camera's automatic functions behave when you tape over the data contact?

Using Shake reduction w/Teleconverter

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