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Old Jan 20, 2006, 10:32 PM   #1
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This photo was shot today with my FA* 300mm f/4.5 and the Pentax 1.4X-S converter, making it a 420mm lens f/6.3.

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Old Jan 20, 2006, 11:42 PM   #2
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That's really a horses _ _ _ !

Nice pic:-)
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Old Jan 21, 2006, 7:24 AM   #3
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tack sharp tom!
looks like i may be in the market for 1.4x.
actually that lens would be a 630mm f6.3 on the D. course you know that.
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Old Jan 21, 2006, 8:53 AM   #4
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I have both the Kenko 1.4X and the Pentax 1.4X-S and the Pentax shows almost no loss of sharpness that I can see, where the Kenko is nice but there is a noticeable softening of the image. The Pentax is more money, but if you are looking for the best image, it is the way to go.

Actually I did not know it was a 620, so thanks for the info.

Tom
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Old Jan 21, 2006, 9:41 AM   #5
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sure, with the magnification factor of the DSs sensor of 1.5 all your lenses are higher.
ie: your 300 x 1.5 = 450mm and you still get to keep your low f-stop..

do you know of the sigma tele-converters??

roy
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Old Jan 21, 2006, 12:00 PM   #6
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I have never used the Sigma converters, but you would be hard pressed to beat the Pentax for image quality.
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Old Jan 23, 2006, 8:10 AM   #7
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Very nice, I have a Takumar A-series 2X converter (MF), Takumar means it is a Pentax design but without the SMC coating (not like the old screw mount Super Takumar). I haven't tried it yet but hopefully it will be sharp, although I am sure the coating will result in a little less contrast.

I have used it on my film Pentax cameras in the past and gotten very good results, my biggest issue with the *istDL is that I am finding it difficult to get consistently good manual focus, wish it had a split image rangefinder screen.

Again, excellent result, the 300mm is an impressive lens.

Ira
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Old Jan 23, 2006, 9:38 AM   #8
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Wow great shot.

How far you were away? Did you use tripod ? Or you shot like 1/1000?

Daniel


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Old Jan 23, 2006, 6:45 PM   #9
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Pentax FA* 300mm, Pentax 1.4X-S converter, 1/750 sec, f/10, ISO 400 with *istDS.

I was about 35 yards away, shooting out the window of my car, using a bean bag on the glass edge to lay the lens on. It is cold here, so staying warm is a priority!

The converter is a A converter, so the DS can read the f/stop and shutter speed, although the auto focus does not work with this converter. The Kenko converter I have is auto focus and reads the setting automatically, but the final image is quite a bit softer than with the Pentax.

Don't confuse the 1.4X-S converter with the 1.4X-L converter, which will only work on lenses longer than 300mm, with some exceptions, since it will not fit the rear of the shorter lenses.

Tom
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Old Jan 26, 2006, 5:02 PM   #10
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"How far you were away? Did you use tripod ? Or you shot like 1/1000?"

Got out the trusty laser rangefinder today and the horse was 52 yards away when I shot the image.

Tom
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