Ah. I can't imagine how you'd spin a Beattie screen. Maybe if it was one of the really big ones, however you are the one who made that wildly cool looking thing. :) The large format Beattie screens are freakin expensive. One goof and another $300 down the drain.

Funny, I got this image in my head of your friend who likes to rotate things.

http://www.holyzoo.com/media/galleri...honeplate.jpeg

:D

<<<-- Originally posted by Steev Dinkins : Ah. I can't imagine how you'd spin a Beattie screen. Maybe if it was one of the really big ones, however you are the one who made that wildly cool looking thing. :) The large format Beattie screens are freakin expensive. One goof and another $300 down the drain.

Funny, I got this image in my head of your friend who likes to rotate things.

http://www.holyzoo.com/media/galleri...honeplate.jpeg

:D -->>>

Problem with beattie is, that you can rotate it just by center, or vibrate with it. I though the idea of my friend was to buy just fresnel lens and put it close to rotating ground glass... Yeah, the photo you post is appositing...

Dave-
You can oscillate a Beattie (or any other fresnel/GG combo)focusing screen BUT you need to keep the oscillations very very tight. 1 or 2 mm at most. Have you look into the Maxwell Precision Optics focusing screens? They can be order to custom sizes and focal lengths and are reguarded by many pro still photographers to be the brighter and sharper than the Beattie (not that Beattie screens are bad- they are GREAT). I worked with the owner to come up with a custom screen and I couldnt be happier with it. Its going into my medium format/35mm oscillating adapter. FYI they dont have a website but doing a google search should turn up contact info. Fair warning - Bill, the owner, likes to TALK....A LOT. Have a clear idea what all your measurement should be and with his incredible optical knowlege he should be able to help you.

<<<-- Originally posted by Brett Erskine : Dave-
You can oscillate a Beattie (or any other fresnel/GG combo)focusing screen BUT you need to keep the oscillations very very tight. 1 or 2 mm at most. Have you look into the Maxwell Precision Optics focusing screens? They can be order to custom sizes and focal lengths and are reguarded by many pro still photographers to be the brighter and sharper than the Beattie (not that Beattie screens are bad- they are GREAT). I worked with the owner to come up with a custom screen and I couldnt be happier with it. Its going into my medium format/35mm oscillating adapter. FYI they dont have a website but doing a google search should turn up contact info. Fair warning - Bill, the owner, likes to TALK....A LOT. Have a clear idea what all your measurement should be and with his incredible optical knowlege he should be able to help you. -->>>

I was looking for the contact before, I found telephone even address... But... I'm not from America, I'm from Europe, and its quiet difficult to reach something over sea :/

On these pictures you can see, how fresnel lens from focusing screen makes brighter images and distribute light into corners...

http://web.datriware.com/gfx_photos/articles/p850.jpg
http://web.datriware.com/gfx_photos/articles/p849.jpg

Here how we works :)))

http://web.datriware.com/gfx_photos/articles/p851.jpg

Next week I will take photo from NIKONs focusing screen and then Beattie...

Where did you place the fresnel lens in the mix of the camera rig?

I have the opportunity to buy a top condition second hand Beattie Intenscreen for approx $30 US. Is this a good deal?

Also it is for a Nikon F5 and has no grid lines (model 82180) Will this be suitable for a static adaptor? Approximately what size is the intenscreen?

Thanks
Mark

brand new is about $90 US, 25/37mm, works for me.

Brett,
optically speaking, if you oscillate one exactly 1 mm, how much do you think the image will be blurred due to that lateral lens movement?
some background: moving any image carrying optical element perpendicular to the optical axis moves the formed image,as far as I can tell.

I think I'll order a Maxwell screen tomorrow.
-Les

<<<-- Originally posted by Brett Erskine : Dave-
You can oscillate a Beattie (or any other fresnel/GG combo)focusing screen BUT you need to keep the oscillations very very tight. 1 or 2 mm at most. Have you look into the Maxwell Precision Optics focusing screens? They can be order to custom sizes and focal lengths and are reguarded by many pro still photographers to be the brighter and sharper than the Beattie (not that Beattie screens are bad- they are GREAT). I worked with the owner to come up with a custom screen and I couldnt be happier with it. Its going into my medium format/35mm oscillating adapter. FYI they dont have a website but doing a google search should turn up contact info. Fair warning - Bill, the owner, likes to TALK....A LOT. Have a clear idea what all your measurement should be and with his incredible optical knowlege he should be able to help you. -->>>

Test screens with Maxwell optics GG...

http://web.datriware.com/gfx_photos/articles/p945.jpg

Dave-
We are using the same screen but your results appear to have far less clarity. Are you moving the GG or is it static in that picture? Is that a copy of a resolution chart or a original?

I now have a Maxwell screen too, tests will follow shortly. By the way, Bill indicated to me that a regular ground glass can be used with no hotspot as well, if the optics are chosen well!

-Les

<<<-- Originally posted by Brett Erskine : Dave-
We are using the same screen but your results appear to have far less clarity. Are you moving the GG or is it static in that picture? Is that a copy of a resolution chart or a original? -->>>

Its original I printed on laser printer. GG is static.

"By the way, Bill indicated to me that a regular ground glass can be used with no hotspot as well, if the optics are chosen well"

Yes. A fresnel is at type of lens so yes a regular lens will do the same thing but notice his choice words, "chosen well" - Finding the perfect lens has been proven difficult. From someone that has been there - save yourself a lot of time and just get a real focusing screen.

For a $500 adapter, the $130 focusing screen is a lot of dough. Maybe $35 of glass will help keep costs low. I don't know yet. How much did he sell you the screen for ?

-Les