If you are a regular reader of my blog, then you may well be aware of the problems I have experienced with my Fuji 55-200mm lens. Following some rather odd results, the lens was returned to Fuji back in November who couldn’t find any problems. Wex then returned it for a second time following a review of some test images as they agreed, there must be a fault.
The lens is still being inspected by Fuji but Wex have kindly allowed me to trade it in against another lens. This is a huge help as being without a good telephoto lens means I can’t use the Fuji kit properly and always end up taking a second camera with me. Thanks to the trade in I now have the Fuji 50-140 f/2.8 + 1.4x Teleconverter and this weekend was my first outing.
Unfortunately, the location we chose was very foggy and remained so for most of the day. The fog did lift to a certain level but generally it was too dense to use the new lens properly. I did however manage a few test shots of distant rocks which a group of climbers were scaling. I mounter the camera on my tripod and lined up the shot using both the lens and teleconverter. The conditions were still with no wind and I was using a cable release.
To my horror, when I zoomed in to check the image I could see a lot of camera shake and the image was blurred. I tried again and again but I couldn’t remove the shake. I then tried removing the teleconverter to see if it was the cause of the problem but it wasn’t. The results looked very much like those I experienced with the lens I had returned.
Below you can see one of the problem images. Notice how the shake isn’t consistent across the frame and some areas almost come into focus but don’t quite get there.
And a section at 100% magnification.
Then through trial and error I worked out the cause of the issue. Take a look at the image below which was shot immediately after the image above. This time the image is pin sharp across the frame.
And again, a section of the image at 100% magnification.
The cause of the issue was the Lee 0.3 ND grad filter I was using. With the filter on the lens, the images were out of focus and appeared shaky. With the filter removed the images were crisp and sharp. I could repeat the result time and again with all my Lee filters.
What appears to be happening is that the filter is causing a problem for the autofocus mechanism in the XT2 and it continues to refocus as the shot is being taken. Later I turned off the autofocus and could focus manual to capture a pin sharp image. If I set the camera back to autofocus the problem occurred again. What I haven’t been able to work out is why I have only seen the issue with the telephoto lenses. My other lenses (10-24, 16-55 and 18-55) all work fine with my filters.
This is one to watch out for if you are a landscaper and use filters. I was also wondering if anyone else has experienced a similar issue?