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Old Feb 8, 2005, 4:45 PM   #1
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I wanted to find out some facts about the FZ3 + Raynox DCR-250 combination, so I did some testing. Here are the results (click on the thumbnails for 700x525 pictures):

First I was interested in the focus range at different focal distances (all mm values are 35mm-equiv). The pictures are only resized, not cropped.

At 4x zoom (170mm) the focus range is10.7cm- 13.0cm.

F2.8 F8.0

You can see some vignetting with F2.8 (I wonder why it's worst at the lower left corner), but with F8.0 there is just very little vignetting in the lower left corner.

At 8x zoom (313mm) the focus range is 11.2cm - 12.7cm.

F2.8 F8.0

A slight vignetting and the corners look a bit unsharp with F2.8. With F8.0 no vignetting and everything is sharp.

At 12x zoom (420mm) the focus range is 11.1cm - 12.7cm (maybe my measuring was imprecise, I think it's the same range as with 8x zoom).

F2.8 F8.0

Again slight vignetting and unsharp corners with F2.8, no vignetting and everything sharp with F8.0.

As you can see, there isalmost nodistortionon all ofthe pictures. At 420mm and the maximum distance of 12.7cm, the area distplayed on the picture is almost excactly 1cm wide (you have about 1.1cm on the picture if you reduce the distance, believe it or not).

Now let's have a look at the depth of focus (DOF). All pictures here are crops, no resizing.

At 4x zoom (174mm):

F2.8 F8.0

DOF is about 2mm with F2.8 and about 6mm with F8.0, which is not much, but ok.

At 8x zoom (313mm):

F2.8 F8.0

Here DOF is <1mm with F2.8 (I think) and 2-3mm with F8.0, which is not so easy to handle (handheld no chance with F2.8 ), but it gets worse at full zoom.

At 12x zoom (420mm):

F2.8 F8.0

With F2.8 we have maybe 0.1mm (whatever, you'll never use F2.8 at full zoom unless shooting totally flat things like paper and using a tripod). With F8.0 DOF is <2mm which is really hard to handle, so don't try to shoot any moving objects.
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Old Feb 8, 2005, 5:05 PM   #2
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Thanks for doing all these measurements. They pretty much confirm my experience with the dcr250 and fz1. Best dof you can get at 12x and f8 is about 1mm.
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Old Feb 8, 2005, 7:39 PM   #3
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Wonderful test of the 250, which I have. Thanks X 1000!
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Old Feb 9, 2005, 6:00 AM   #4
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I think with the small mount diameter and rear element, this lens in not suitable for the FZ series. Anything less the 50mm glass in a 52mm mount will result in poor performance. The vignetting in one corner could be caused by an off center adapter.
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Old Feb 9, 2005, 6:48 AM   #5
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playlong wrote:
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I think with the small mount diameter and rear element, this lens in not suitable for the FZ series. Anything less the 50mm glass in a 52mm mount will result in poor performance. The vignetting in one corner could be caused by an off center adapter.
Maybe it is not suitable for the big FZ10/15/20, but for the FZ1/2/3 it seems to be ok. The unsharp corners with F2.8are nothing to worry about. You won't use an open aperture anyway, because of the very small DOF.
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