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03-28-2011, 02:56 PM   #1

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Praising the 75mm FA on the 645D

The 75mm is not a lens I used much on the 645N. I have used it on the 645D, it's so small and light that it almost turns the 645D into a walk-around camera. I have also discovered it to be very sharp, flare free and quick to focus. I took this shot as I was walking to my car. The shot is directly into the sun. I'm amazed at the sharpness and contrast. Full scene and crop; images suffer from jpeg conversion, the sun is clearly visible in the original and considerable detail in the clouds has been lost

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03-28-2011, 07:22 PM   #2
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Thomas, phenominal detail (and great image too) with the FA 75mm. I couldn't agree more, the samples of this lens I tried was very impressive and quite consistant. The only thing I noted is performance (examining crops) is underwhelming at f2.8 and somewhat better at f4...but beyond that it resolution is as good as one would hope for. The only other thing I noted was in bright reflective situations (like sunlight glaring off chrome etc.) was incredably high levels of CA at f2.8 and f4....some of the highest I've seen in a lens. Of course this lens was produced prior to the digital era and reducing it in post processing is generally effective. Love the wintery feel of this image and the lone bird certainly adds to this.

Dave (D&A)
03-29-2011, 07:37 AM   #3

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Original Poster
Thanks Dave. I didn't test this lens much, since I assumed it would get little use on the 645D. I generally use f/8 or 11 and haven't seen any CA (I'm not sure if the camera corrects raw files automatically). It is certainly easier to walk around with this rather than the 45-85mm zoom.
03-29-2011, 07:46 AM   #4
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Hi Thomas,

F8 or f11 is ideal with this lens, both for achieveing great resolution across the frame as well as reducing CA to a minimum. CA can be seen in abundance when the lens is used at f2.8 and f4, especially in conditions that promote it, as I described in my first post above. At f8 and f11, even in those conditions promoting CA, it's deminished to the point where only slight traces may be evident, if that. So your shooting conditons (overcast day) along with setting the lens to f8 or f11, was near ideal.

Dave (D&A)

03-29-2011, 09:56 AM   #5
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Oddly, I did not expect to use the 75mm much but I've warmed to it, and my preferences have changed. As it is light and small, it now is standard fodder for the bag.

As for the 645D, mind that there are plans for a FF 645D, which changes the picture.
04-07-2011, 05:05 PM   #6
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Has anyone compared the performance of this lens to the 80-160 zoom at 80mm? I find the zoom to be quite good at the wide end.

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