|16th of June 2004 (Wed)||#1|
Join Date: Jun 2004
Kenko KNT-20 2X for the G#
I am considering buying the Kenko lense from lensmateonline.com. I have been searching this forum for opinions of this lense. Everyone seems to have different opinions of different lenses. My question is - I have seen a number of people say that it only works at full zoom. Is this a mechanical issue or a picture quality issue. I would like a lense that would allow me to take pictures at any point between 140mm and 280mm.
Do I need to consider a different lense?
|16th of June 2004 (Wed)||#2|
Join Date: Aug 2003
I had the same problem recently and im sure you will want to take a look at the bible on such matters: http://kazutoku.cside.com/G3CON_eng.htm
As you will find out the kenko is not real 2x, its more 1,7x and if you realy want 2x you will want the Tiffen lens.
As i said, i started out wanting the Kenko, shifted to the Tiffen because of the 2x and ended up buying the Olympus TCON-17 because of outstanding optical quality. But there are considerations such as how much you are willing to pay. Another aspect is that the TCON is quite heavy.
As for why can it be only used at full zoom and this is one i only understood when actualy using the lens, this is what you will see if you dont use it at full zoom:
This effect where you actualy see the barrel is called vignetting and as you zoom you start seeing less of it until it disapears completely arround full zoom.
Check out the other hundred threads about teles in this forum and im sure you will get all the info you need.
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|16th of June 2004 (Wed)||#3|
Join Date: Dec 2003
I have the knt 20 for my g3, and when I got it I was surprized by how small the lens on the back end is. You can zoom out from full a few times with it on. If you need further info I can test it.
|17th of June 2004 (Thu)||#4|
Compensating for his small ... sensor
Join Date: Jan 2003
Location: Stuttgart/Cologne, Germany
Re: Kenko KNT-20 2X for the G#
Unfortunately, this issue also is normally not mentioned in lens tests (e.g. on Kazutoku's side), as most users want to use the lens as far zoomed in as possible and go with that limitation. It's pretty annoying on a wide angle converter, though ... so this normally is mentioned
So you have to continue asking people who do have certain teleconverters until you come along one that has that characteristic.
Most likely, the lens you're looking for has a larger diameter (e.g. the new lenses for the Pro1) ... but these can be quite costly, as I remember.
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