DV Info Net - New moving ground glass mechanism

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- - New moving ground glass mechanism (https://www.dvinfo.net/forum/alternative-imaging-methods/36209-new-moving-ground-glass-mechanism.html)

>I would still be curious if you could get same sharp image on Z1@ 2.8 and a larger CU lens (for the sake of knowing...)

I would surely doubt this. When I move a piece of paper into view across the 250D - it only becomes visible within about 20mm central diameter - this is because the FX1 has about 5 dgree FOV when zoomed in - a larger CU would be a waste of glass and money imho :)

>What is the power? +3,4,7?

the 250D is +4 dioptre, spectra coated about $90, and Canon do not recommend stacking more than one :( and if they did, maybe it would only be fully sharp at F!!

Do you have it mounted on the lens or further away? 72mm dia?

interesting question...

I am using FX1>72-58mm step ring>Canon 250D 58mm>58mm tube>>>>....

moving the dioptre further way from the FX1 will use more of the 250D glass and increase magnification. Have you found a sweet spot??

Try a "hand-held" close to the lens (skip the 72-58) see what happens.

no specific advantage gained

If you could only get your hands on a 72mm Century (to test it only) you may notice a difference... (any local rental house/photo store has it?..)

in the SLR lens world the standard macro lens is the 100mm F4, I think that alone must be saying something. Most articles I have read suggest F5.6-F8 as the optimum for macro photography. CU filters are not regarded favourably in the SLR community.

Sorry for the diversion, but I added a new album: lens comparison
http://dandiaconu.com/gallery/album18
On the CU issue; I have used the CU achromat from Century with MPIC (in front of 1.4/50 Nikkor) and it seem fine. (eye CU). However, closer to "academic" would be macro lens/extension tubes/adapters/bellows.

This local rental house
http://provisionvideo.com/features.htm
will show some changes in the nearest future:
http://provisionvideo.com/events.htm

So the unit is just for rental not purchase?

No, you can order one unit just as well.

Quote:

Originally Posted by Dan Diaconu

No, you can order one unit just as well.

Do you know what the rental and purchase prices are?

I had the pleasure two days ago to sell the first MPIC and the first set of lenses (I geared and re greased) for 13K configured for both Z1 and DVX100A. I have also included (in kind) my FF(yes the one I have photograped on my site) and the CU achromat (I did not use) just for ECU (in front of the SLR lenses). When a larger production scale will commence, the price will drop a lot. The local rental rate (for now) is $450/day (all lens included) We might look into a more complete package (FF, filters, MB, etc) once we will get some FB. I also have in mind a short film out test (I am very curious...) DV, HD and then both with MPIC. (the only way to determine results imo).
I have to do it since the first FEATURE was confirmed and booked for Sept-Oct-Nov (six weeks)
More to come. Oh... BTW, my patent application for the ELECTRO-MAGNETIC DRIVE (the "new GG mmoving mechanism" which is now SIX MONTHS OLD without being replicated) was allowed. (I still have to do some changes in the drawings and... oh well.. minor stuff...) Hopefully, my first "misterious" customer will refrain from taking it apart and commencing production without a "dinner invitation"........
I made this PUBLIC ANNOUNCEMENT since I did not (till today) actually reveal any details about the movement.
This forum was my way to establish a "priority date" for the contraption and determine if is worth moving it forward.
Now... is this a public invitation to take it to production or what? Who am I going to meet in court with? Anyone? I would actually preffer to leave some "younger blood" look after production, sale, etc as I have some other "toys" to make. Anyone interested, use this forum's email as my personal email is "haunted"...... (I did not even received the "new posts",.... I had to check the forum......) better yet, call me.

Movement of Fresnel

Dan,
How is it that the image is not effected by the movement (even as slight as it is) of the fresnel focusing screen? if I move mine, the image moves with it. What I'm thinking is, if your movement is even as small as .36mm, that is still 1% of the width of the frame, seems like you'd get some kind of blur. But your freeze frames look good, so I was wondering what the limits of moving the fresnel are, and how they effect image quality.

I look through this thread and didnt see this question asked, but if you covered it before just direct me to that post.