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Fujinon CD 7x42, 8x42, 10x42 roofs

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Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: September/19/2007 at 17:20
Bird Watcher View Drop Down
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Fujinon has discontinued the CD roof prism binoculars. They are currently on close-out sale, around $200.

These retail for $725, $760, $790.

You should be able to view the spec.'s at www.fujinon.com

They are phase coated, pure silver-mirrored Bak-4 prisms, 100% multicoated(FMC), 100% water-fog-fungus proof.

You will have to do a google search as they are from a competitor.

FOV 7x 420' or 8 degrees Eye Relief 20mm

FOV 8x 393' or 7.30 degrees Eye Relief 15mm

FOV 10x 341' or 6.30 degrees Eye Relief 13mm

I ordered the 7x42mm.

Edited by Bird Watcher
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: September/24/2007 at 06:59
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please let us know what you think about that 7x42
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: October/11/2007 at 08:00
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These seem to be priced well. I have the FMTR SX in 7x50 and have been very impressed with them. Does anyone know much about the quality of these roofs?                                                                                                                                          John
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: October/11/2007 at 18:49
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http://www.cloudynights.com/ubbthreads/showflat.php/Cat/0/
Number/1849551/page/2/view/collapsed/sb/5/o/all/fpart/1/vc/1


Edited by Bird Watcher
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: October/18/2007 at 21:05
westrn View Drop Down
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Received the Fujinon CD 7x42 today. It is clear and bright. However it also has an excessive amount of "rolling ball" view. Much more than my Pentax DCF WP 10x40. It is distracting. I will try again tomorrow, and see if I can tolerate this. It is very clear over 50 to 60 percent of its field and was a very good price. I was expecting it to be better than the Pentax. I have the Fujinon FMTR SX 7x50 and I guess I thought the CD, while not as good, would be better than it   is.      & nbsp;         & nbsp;                     John     

Edited by westrn
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: October/19/2007 at 15:17
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John,

Would you mind explaining the rolling ball.
My 7x42's were fine.
You might want to exchange them if you like them.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: October/19/2007 at 16:33
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Also called the globe effect. It is only seen while panning and is the way the brain interprets the change in visual field from center to edge. Holger Merlitz has a mathmatical explanation on his website. I tried them out again today and found that at closer distance the effect is less noticable.        &n bsp;         &n bsp;         &n bsp;         &n bsp;John
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: October/19/2007 at 17:17
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I've got a pair also (for my brother) and I do not find the rolling ball effect particularly objectionable, but it is there.

Very nice binoculars though.  I would rank the pair that I have as in the same quality ballmark as Pentax SP.

ILya
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: October/19/2007 at 20:02
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ILya,

Since I really haven't noticed anything I guess that it is something very minor in the one that I received.

Is it something limited to roof prism binoculars, such as spiking/spoking, or is it also seen in porro prism binos?

What causes it and will it be visible in the 8x and 10x as well? Is it more pronouned as magnification increases?

What exactly do we look for, at what distances, and does it makes any difference what the background is like? For example, is it more noticable using the sky as a background, or, is it equally noticable when looking at trees?

Thanks

Edited by Bird Watcher
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: October/19/2007 at 21:05
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You will generally see this at longer distances a little more (it is more noticeable when looking at a larger scene, which naturally occurs when you are looking at something distant).  It is a design compromise, not really a flaw. 

When you are looking at something through these Fujis, the picture appears exceptionally flat and well resolved.  However as you start pannig, it seem like the scene is curved with the center portion being closer to you.  If you find some distant object (a tree for example) and place it into your field of view right near the edge of it and then pan the binocular so that the object moves across your field of view, you will see the following: the object will appear to be moving a little toward you as it is moving toward the center of the FOV and a littl away from you as it is moving from the center of the FOV toward the edge.

It looks like the object is moving along the surface of the sphere and you are looking at that sphere from the outside.

To counteract that, a lot of binoculars are set up so that the image is not perfectly flat but a little curved to counteract the rolling ball effect.  It appears as if you are looking at the surface of the sphere from the inside of it.  However, when you pan, the two curvatures cancel out and the image appears flat.

ILya
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: October/20/2007 at 07:51
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ILya,

Thanks, my eyes don't seem to notice anything, perhaps if I look for it I will learn what it is.

I just realized, after reading some other posts about the CD, that I do not pan very much, usually when viewing airplanes, or the occasional bird(s) in flight. Of course, my concentration is "focused" on the central area only and not on the outer edges.

Edited by Bird Watcher
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