Question for the EX-25

bernards · 10th January 2008

I just bought the adapter and have some trouble with the 70-300. Checked the manual and found only a small handful of lenses listed. I can't really manually focus (very small band), instead I need to physically move the camera or use the zoom ring to focus.

Is this usually the case with the EX-25?

tomcat · 11th January 2008

It's normal with the EX-25.
When attached to a lens, it usually result in a very narrow working range which is totally unlike the normal working range of the lens. You would need to 'walk' the camera until the working range is reached and only then can the focusing work.

headfonz · 11th January 2008

does the 70-300 have a focus limiter? maybe you might want to check how much it affects manual focusing with the limiter on / off. what i do with the 40-150 + EX25 is that i leave it on infinity and "manual" (physically) focus by moving whenever i have to adjust the zoom.

bernards · 11th January 2008

Thanks a lot tomcat. I tried out the 70-300 + EX-25 combi today. Not much success. It's very difficult to focus using the zoom. A little twist and it jumps too much. I didn't manage to figure out a system on how to work the various pieces together, it started to rain in the afternoon. You can see from the pics below many of the focus are a little out.

headfonz. Yes there is a focus limiter switch. When you flip to MF, the minimum distance drops from 1.2m to 0.96m. I'll try out your method the next time. Focusing using the zoom is not a good method.

Kirika · 13th January 2008

I think you should really consider not using the focusing ring. My 70-300's point of focus moves a lot even if you make a tiny adjustment on the ring. Moving the camera in and out works perfectly fine, tho. Maybe that's why people say that macro = manual focus. Hmm...

drakon09 · 13th January 2008

Macro = move focus actually.

But, in a bright enough lightning, and targeting the small AF range, and a small enough aperture, you actually can AF quite easily.

blurboiboi · 17th February 2008

yah... you would need to move in and out to focus when using a 70-300 with an ex25...
i use this setup to shoot butterflies.... it takes awhile to get use to it...

10th January 2008	#1
bernards Member Join Date: Feb 2004 Posts: 884	Question for the EX-25 I just bought the adapter and have some trouble with the 70-300. Checked the manual and found only a small handful of lenses listed. I can't really manually focus (very small band), instead I need to physically move the camera or use the zoom ring to focus. Is this usually the case with the EX-25? Last edited by bernards; 10th January 2008 at 07:50 PM.

11th January 2008	#2
tomcat Senior Member Join Date: Nov 2003 Posts: 3,456	Re: Question for the EX-25 It's normal with the EX-25. When attached to a lens, it usually result in a very narrow working range which is totally unlike the normal working range of the lens. You would need to 'walk' the camera until the working range is reached and only then can the focusing work. __________________ Fish Pics:http://www.pbase.com/pschia/oddballs IR Pics:http://www.pbase.com/pschia/infra_red

11th January 2008	#3
headfonz Member Join Date: Apr 2006 Location: central Posts: 1,357	Re: Question for the EX-25 does the 70-300 have a focus limiter? maybe you might want to check how much it affects manual focusing with the limiter on / off. what i do with the 40-150 + EX25 is that i leave it on infinity and "manual" (physically) focus by moving whenever i have to adjust the zoom. __________________ http://www.flickr.com/photos/headfonz/

11th January 2008	#4
bernards Member Join Date: Feb 2004 Posts: 884	Re: Question for the EX-25 Thanks a lot tomcat. I tried out the 70-300 + EX-25 combi today. Not much success. It's very difficult to focus using the zoom. A little twist and it jumps too much. I didn't manage to figure out a system on how to work the various pieces together, it started to rain in the afternoon. You can see from the pics below many of the focus are a little out. headfonz. Yes there is a focus limiter switch. When you flip to MF, the minimum distance drops from 1.2m to 0.96m. I'll try out your method the next time. Focusing using the zoom is not a good method.

13th January 2008	#5
Kirika Member Join Date: Aug 2007 Posts: 720	Re: Question for the EX-25 I think you should really consider not using the focusing ring. My 70-300's point of focus moves a lot even if you make a tiny adjustment on the ring. Moving the camera in and out works perfectly fine, tho. Maybe that's why people say that macro = manual focus. Hmm...

13th January 2008	#6
drakon09 Moderator Join Date: Aug 2005 Posts: 3,690	Re: Question for the EX-25 Macro = move focus actually. But, in a bright enough lightning, and targeting the small AF range, and a small enough aperture, you actually can AF quite easily. __________________ www.facebook.com/darrengyh

17th February 2008	#7
blurboiboi Senior Member Join Date: Jan 2003 Location: Loyang Posts: 2,242	Re: Question for the EX-25 yah... you would need to move in and out to focus when using a 70-300 with an ex25... i use this setup to shoot butterflies.... it takes awhile to get use to it...