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11/07/2008 11:10:42 AM · #1 |
Does anyone know if this is compatible with my Nikon D90 and my Nikon AF Zoom-Nikkor 18-200mm f/3.5-5.6G ED-IF AF-S DX VR II
//www.bhphotovideo.com/c/product/406962-REG/Kenko_K30PRO300DGN_PRO_300_3x_DG.html#features
and does this mean my 200mm will be like 600mm?? Still autofocus and VR? |
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11/07/2008 12:01:24 PM · #2 |
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11/07/2008 12:16:16 PM · #3 |
i think it doesn't make sense putting any teleconverter infront your 18-200.
you'll loose way too much light and AF. to give you an exmaple, your lens is at f5.6 at 200mm. even with a 1.4x tc you'll have a hard time focusing (even tho it will probably work, but really slow) at f8 then. with a 3x tc you'll be at f16(!) at 200mm which really doesn't make sense.
that aside i think a 3x tc will result in quite some soft images, even with a high qualitiy prime. if you're looking to get a longer range maybe get a used 70-200 f2.8 and use a 1.7x tc that will give you good results (converted 120-340 f4.8)
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11/07/2008 12:16:22 PM · #4 |
| 3x is very aggressive for a teleconverter. You will lose just over 3 stops of light, meaning that at the long end, yes, you will have 600mm of reach, but at roughly f/16 max aperture! There will be no possibility of AF, and the viewfinder will be very dark, making manual focus a nightmare. What's worse, sharpness will suffer badly. |
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11/07/2008 01:50:07 PM · #5 |
| THANKS....that is EXACTLY what I wanted to hear, before money was wasted. |
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11/07/2008 02:07:08 PM · #6 |
Originally posted by kirbic:
3x is very aggressive for a teleconverter. You will lose just over 3 stops of light, meaning that at the long end, yes, you will have 600mm of reach, but at roughly f/16 max aperture! There will be no possibility of AF, and the viewfinder will be very dark, making manual focus a nightmare. What's worse, sharpness will suffer badly. |
Agree, it would probably be cheaper just to upsize it in phothshop then run it through the gaussin blur filter.. the end result would be the same.. |
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11/07/2008 02:43:04 PM · #7 |
I have this very tele-converter. It is not something I would recommend, the picture quality is poor, it is impossible to take steady pictures unless mounted on a tripod. I will say it works okay for astrophotography, but that is it.
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