Trouble with autofocus while using EX-25 extension tube

VSW · 5th May 2006

I just bought an EX-25 extension tube to be used with my 50mm macro and 50-200 mm lenses, but I am not able to get the autofocus to work. I tried with the subject at varied distances but still not able to use the autofocus. The firmware on my E500, lenses and the EX-25 are up to date. Can anyone help me with the trouble shooting to get the autofocus to work. Thanks!

VSW

chianchiek · 5th May 2006

you should check the spec b4 you get it... refer to the link below:
http://www.olympus-esystem.com/dea/p...-25/index.html
only manual focus works for 50-200mm and autofocus works partially on 50mm depends on your shooting range...

wanna sell the tube? I'm interested, hehe...

kimbo · 6th May 2006

THere are little tricks to use it with the 50-200. the 'magnification' factor is not constant throughout, with 50mm end largest magnification. As a result, you can also manipulate the zoom for focus. Once you have come into a region of potential focus, autofus will work. So what i do is use my zoom for initial 'lead-in' for a rough focus, then half-press to autofocus.

u2nofear · 6th May 2006

can try "S-AF+MF" , it work on my 40-150mm lens

raycsk · 6th May 2006

50mm + EX25: you have to get rewally close to the subject. Like a few cm away

50-200 + EX25: distance about 1-1.5M from subject.

VSW · 11th May 2006

Hi All,

Thanks for the feedback and useful advise, managed to get comfortable with the EX 25 now after a few hours of experimentation in the SBG last weekend. It was initially frustrating that the autofocus was not working as good as I thought it should, but once I recalibrated my expectations I have no issues.

Cheers,
VSW

5th May 2006	#1
VSW New Member Join Date: Feb 2006 Posts: 19	Trouble with autofocus while using EX-25 extension tube I just bought an EX-25 extension tube to be used with my 50mm macro and 50-200 mm lenses, but I am not able to get the autofocus to work. I tried with the subject at varied distances but still not able to use the autofocus. The firmware on my E500, lenses and the EX-25 are up to date. Can anyone help me with the trouble shooting to get the autofocus to work. Thanks! VSW

5th May 2006	#2
chianchiek Member Join Date: Jan 2005 Posts: 184	Re: Trouble with autofocus while using EX-25 extension tube you should check the spec b4 you get it... refer to the link below: http://www.olympus-esystem.com/dea/p...-25/index.html only manual focus works for 50-200mm and autofocus works partially on 50mm depends on your shooting range... wanna sell the tube? I'm interested, hehe...

6th May 2006	#3
kimbo Member Join Date: Jun 2004 Posts: 111	Re: Trouble with autofocus while using EX-25 extension tube THere are little tricks to use it with the 50-200. the 'magnification' factor is not constant throughout, with 50mm end largest magnification. As a result, you can also manipulate the zoom for focus. Once you have come into a region of potential focus, autofus will work. So what i do is use my zoom for initial 'lead-in' for a rough focus, then half-press to autofocus.

6th May 2006	#4
u2nofear Member Join Date: Feb 2006 Posts: 1,487	Re: Trouble with autofocus while using EX-25 extension tube can try "S-AF+MF" , it work on my 40-150mm lens

6th May 2006	#5
raycsk Member Join Date: May 2002 Location: NE Singapore Posts: 405	Re: Trouble with autofocus while using EX-25 extension tube 50mm + EX25: you have to get rewally close to the subject. Like a few cm away 50-200 + EX25: distance about 1-1.5M from subject.

11th May 2006	#6
VSW New Member Join Date: Feb 2006 Posts: 19	Re: Trouble with autofocus while using EX-25 extension tube Hi All, Thanks for the feedback and useful advise, managed to get comfortable with the EX 25 now after a few hours of experimentation in the SBG last weekend. It was initially frustrating that the autofocus was not working as good as I thought it should, but once I recalibrated my expectations I have no issues. Cheers, VSW