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Old February 12th, 2006, 09:41 AM   #31
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yeah thats exactly what i thought. It looks like the assembly is held together with 4 screws. Im contemplating whether or not i want to attack the screws or just return the screen and maybe get my $30 back before its too late.
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Old February 12th, 2006, 09:56 AM   #32
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I just thought I'd mention that I also have a gs150 and a static adapter made of pvc using the nikon d as a ground glass. I use a pentax lens and I realize that I get some vignetting I can completely rid of it by zooming in to about 2.5x. I actually see no noticeable hot spot just looking at it. I think it might be your lens. Can you maybe post pics of your setup?
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Old February 12th, 2006, 10:12 AM   #33
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Quote:
Originally Posted by Jeff Tyler
I just thought I'd mention that I also have a gs150 and a static adapter made of pvc using the nikon d as a ground glass. I use a pentax lens and I realize that I get some vignetting I can completely rid of it by zooming in to about 2.5x. I actually see no noticeable hot spot just looking at it. I think it might be your lens. Can you maybe post pics of your setup?

Could you confirm, your using the Nikon D as ground glass with the original condenser correct?

Exactly what do you mean by "some" vignetting? Here is a shot taken from the gs150 zoomed into the focus screen to fill the frame.
http://www.buysmartpc.com/slr/gs150.JPG

Are you using a lens longer then 50mm?

here are some shots i posted earlier of my setup:
http://www.buysmartpc.com/slr/front.JPG
http://www.buysmartpc.com/slr/back.JPG
http://www.buysmartpc.com/slr/side-back.JPG
http://www.buysmartpc.com/slr/top.JPG

the lens and the focus screen are not glued, and i am able to make fine adjustments.

my minolta lens is a 50mm 1:1.7

Please tell me more about your setup
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Old February 12th, 2006, 10:16 AM   #34
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Based in the fact the Jeff is using the same camcorder and Nikon Screen, it could well be your SLR lens. Might be worth trying a different SLR.

Also, this image: http://www.buysmartpc.com/slr/back.JPG

Was this taken with a still cam?
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Old February 12th, 2006, 10:28 AM   #35
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Quote:
Originally Posted by Wayne Kinney
Based in the fact the Jeff is using the same camcorder and Nikon Screen, it could well be your SLR lens. Might be worth trying a different SLR.

Also, this image: http://www.buysmartpc.com/slr/back.JPG

Was this taken with a still cam?
yes it was taken with a still camera. i did my best to get a visible picture... well i think its clear enough to know whats going on. At the time i did not have a memory stick compatible with the gs150.

i tried two new slr lenses at the store yesterday. I think one was a Nikon 50mm, and the other was some sort of Minolta prime that fit onto my Minolta that would increase the focal length. I got a slightly better picture with the prime but it was not really noticeable.

I also have another Minolta 28mm i tried but the hotspot is much worse then with the 50mm. I imagine this is because of its shorter focal length. Although when i put this 28mm on the Minolta film camera and put the gs150 to the viewfinder i get a perfect image with no vignetting at all without having to zoom in.

I just looked through Jeff's posts and sure enough:
http://www.dvinfo.net/conf/showpost....0&postcount=27

He has some great pictures taken with the gs150 and the Nikon D focus screen. Im really looking forward to hearing from him with more info on his setup.
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Old February 12th, 2006, 10:43 AM   #36
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After looking at http://www.buysmartpc.com/slr/back.JPG im starting to think the the type of Nikon screen is no good. It does not seem to be diffusing the light much at all. You said before it was intended for a certain type of lens?
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Old February 12th, 2006, 10:49 AM   #37
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Yes. The Nikon D focus screen is made for long lenses (~135mm)

"Type D: Overall fine-ground matte field. For specialized close-up photography and for use with long lenses."

<Marco Polimeni> I never tested a D screen but, from a Nikon F manual, I know that using lenses shorter then 135mm the edges of the frame starts to became darker and darker so more the lenses are shorter. </Marco Polimeni>
http://www.dvinfo.net/conf/showpost....8&postcount=41

This is directly from the Nikon website:
"Each screen offers unobtructed viewing and easy focusing over the entire matte surface. Type D is especially for telephoto lenses"

Its working for Jeff though and i really want to look into that.
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Old February 12th, 2006, 11:45 AM   #38
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While fixing an adapter I sold, I put in the Nikon D screen I had ordered for it and tested it with an FD 50mm 1.8, on my GL2. Worked perfectly, no vignetting. I think this "bigger camcorder lens means less vignetting" theory might be true.
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Old February 12th, 2006, 01:37 PM   #39
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Im going to take some pictures of my setup so you can see exactly how mine is so maybe it can help you get yours working.
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Old February 12th, 2006, 02:00 PM   #40
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Quote:
Originally Posted by Jeff Tyler
Im going to take some pictures of my setup so you can see exactly how mine is so maybe it can help you get yours working.
Thanks a lot Jeff, I really appreciate it!
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Old February 12th, 2006, 02:23 PM   #41
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Here you are:
http://img456.imageshack.us/img456/7774/gg9qn.jpg

As you can see what I meant by slight vignetting is the bit you can see in the corners. Its easily avoidable by zooming in a bit. I was surprised to see you had such an extreme hotspot from yours. Here is a pic of my setup:

http://img456.imageshack.us/img456/8840/setup2ub.jpg

Right now I don't have a set way to hold the lens on so its just taped. And the picture taken of the ground glass were without the macro that you can now see(kind of) in this picture. Here is my lens:

http://img493.imageshack.us/img493/2...nsfront0qe.jpg

If you have any other questions just post and I'll be reading this thread. Hopefully I can be of help.
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Old February 12th, 2006, 03:26 PM   #42
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Thanks Jeff.

I have some ideas, ill try them out tomorrow. Ill report back with my results.
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Old February 14th, 2006, 12:39 AM   #43
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I got some good results with the focus screen from my Minolta slr with the focus aid:
(12:22 AM, room lit only by 80 watt light)
http://www.buysmartpc.com/slr/minolta.JPG

its bright enough to see on my monitor, hopefully everyone else can

I know its blurry, i had some tissue paper hold the screen in place and i could not get the lens to focus because the screen was not at a correct distance.

This is on the same adapter and on the same camera. As you can see the image is evenly lit.The hot spot is barely noticeable, would be invisible with 200 watts.

This proves 3 things:
1) The slr lens is fine
2) Adapter works
3) Camera is able to focus and i dont need any macros.

I still cant get anything better then this with my Nikon focusing screen:
http://www.buysmartpc.com/slr/gs150.JPG

im still trying to salvage the Nikon D screen. I ordered another pcx lens from surplus shed, maybe i can replace the one on the screen.

Too bad the Minolta screen has a focus aid..

I wonder if the Nikon ground glass is a Fresnel...

*update*
I was able to add an additional 80 watts = 160 watts

http://www.buysmartpc.com/slr/gs150minolta.JPG
zoomed out
http://www.buysmartpc.com/slr/gs150minoltazoom.JPG
zoomed in
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