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Alternative Imaging Methods
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Old May 13th, 2005, 10:04 AM   #16
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Quote:
Originally Posted by Oscar Spier
Is it the diameter of the lenses?
Yes, IF you relate it to max IRIS! The wider the max aperture,(like 1.4) the better (for any focal).
1)Zoom (on camcorder), 2)distance to GG, 3)focal of the lens and4) max aperture. They all work together and gang up on us to ruin da picthshaaa.... g damit ;-)<
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Old May 13th, 2005, 05:26 PM   #17
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No one seem to have noticed the video of the rally car, that is some job in stabilizing. I'm sure it wasn't shot with the 35mm adapter. (on the other hand, you'll get some extra oscillating for free)
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Old May 13th, 2005, 05:59 PM   #18
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Here here!!! A hell of a job. Not only the stabilization (which is indeed outstanding !!!!!!)but the whole clip. Very, very nice! Bravo again! A very nice and creative spot!
How did I ever miss to post on that? (age?.....)
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Old May 14th, 2005, 08:09 AM   #19
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Isn't it the size of the back lens that give you the light spread and larger image?
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Old May 14th, 2005, 08:22 AM   #20
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Howdy from Texas,

<< Moderator: Isn't it a good idea to add -and home made gear- to the title of this board? >>

Well as far as home-made stabilizers are concerned, Charles King has a great site and an excellent message board covering these projects already, and I don't want to compete with him. He's doing it right. Check out his deal at http://www.hbsboard.com/
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Old May 14th, 2005, 09:22 AM   #21
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That's a great site, and new to me, so thanks.
I didn't only mean home-made stabilizers, I just thought this is the place where you can find people to discuss home-made stuff with, but the borders of 'alternative imaging' are a bit tight.
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Old May 14th, 2005, 12:36 PM   #22
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Dave Spi,

those are great images from the car. I have built a few car mounts myself, but you really seem to have some interesting places to put the camera! Do you have some pics of the car rigs?
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Old May 14th, 2005, 01:30 PM   #23
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Quote:
Originally Posted by Daves Spi
I found the 58mm lens are projecting very small picture on GG, that means more vignetting. If I use Takumar 70-200mm, Im getting twice bigger projected picture. Also for vignetting is better to focus on infinity and then focus by moving lens closer and further to GG. Thats results from my testing. Hope usefull for you...
Quote:
Originally Posted by Oscar Spier
28mm gives a smaler image, 50mm gives a bigger image, but some vignetting [snip] Anyone know what causes this? Is it the diameter of the lenses?

Your mistake is in thinking that the focal length of the lens is the issue. Really it is the ratio of focal length to aperture. For example, an 85mm F2.0 works great. A 50mm F2.0 works pretty well too. But a 24mm F2.0 can demonstrate lots of vignetting depending on your system.

Look at the ratios of focal length to aperture:

85mm/F2.0: 42.5:1
50mm/F2.0: 25:1
24mm/F2.0: 12:1

The issue is not that it is a 58mm lens, Dave. It is that it is a 58mm lens with, I would bet, not a very big aperture.
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Old May 18th, 2005, 09:20 AM   #24
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Quote:
Originally Posted by Dan Diaconu
Here here!!! A hell of a job. Not only the stabilization (which is indeed outstanding !!!!!!)but the whole clip. Very, very nice! Bravo again! A very nice and creative spot!
How did I ever miss to post on that? (age?.....)
Thanks, make me happy and smiling :)

Ok guys... just very short clip shooted from DOF with 58mm lens placed on SteadyCam which is running...

http://test.datriware.com/steady.avi
Its bad take... should not finish on the girl there...

http://test.datriware.com/steady2.avi
Another bad take from testing - unstable, unfocused and dirty...

http://test.datriware.com/steady3.avi
DOF in move...

Remember, it was our first day of testing ever :) First day of wearing steady with DOF, no practice...

Do not have anything more yet, no time :(
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Last edited by Daves Spi; May 18th, 2005 at 09:52 AM.
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Old May 18th, 2005, 02:20 PM   #25
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Dave,

Are you sure your GG is set to the exact registration length for your front lens? It looks to me as if you are out of focus by a millimeter or so. It will make a big difference. Do you have a means to adjust it?
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Old May 18th, 2005, 03:43 PM   #26
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Quote:
Originally Posted by Bill Porter
Are you sure your GG is set to the exact registration length for your front lens?
Im sure it was, but we did not pay attention to focus lens...

http://test.datriware.com/testmatnice.jpg
http://test.datriware.com/testmatnice2.jpg

This shots are from very poor light... First part is under two 11W fluor tubes, second part is taken at 8pm in rainy weather. But, look on the second part and tell me what do you think - not focused or low resolution ?

http://web.datriware.com/files/240_dof.avi

Note the circles made by Maxwell GG. They are visible just from one side (side with fresnel).
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Old May 18th, 2005, 04:44 PM   #27
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I still think it's a little bit out of focus. That's a good thing, because if you are pleased now and it is out of focus, you will be really pleased when you get it dialled in!

I had a friend help me set mine up. He sold me and even gave me some of his leftover parts from when he built his first static adapter. I will see if I can get him to post on here how to do it right.
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Old May 22nd, 2005, 03:37 PM   #28
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Ok guys,

here is another set of tests... Today I've tested NIKON focusing screen from 36mm camera against MAXWELL beattie... (In other words, I have tested $10 against $150 value). I've recorded all onto tape and then made screenshots, so its in full 720x576. First link is beattie, second is nikon. Just look and decide...

Testing screen:
http://test.datriware.com/!testy/max_obrazec.jpg
http://test.datriware.com/!testy/hus_obrazec.jpg

Motorcycle:
http://test.datriware.com/!testy/max_fichtl.jpg
http://test.datriware.com/!testy/hus_fichtl.jpg

Some green trees:
http://test.datriware.com/!testy/max_priroda.jpg
http://test.datriware.com/!testy/hus_priroda.jpg

Some green trees with changed focus:
http://test.datriware.com/!testy/max_priroda2.jpg
http://test.datriware.com/!testy/hus_priroda2.jpg

Wire fence inside trees:
http://test.datriware.com/!testy/max_dratenka.jpg
http://test.datriware.com/!testy/hus_dratenka.jpg

Sun through trees:
http://test.datriware.com/!testy/max_obloha.jpg
http://test.datriware.com/!testy/hus_obloha.jpg

Label of beer:
http://test.datriware.com/!testy/max_krusovice.jpg
http://test.datriware.com/!testy/hus_krusovice.jpg

---

And now some static shots vs motion...

http://test.datriware.com/sm.jpg
http://test.datriware.com/mm.jpg

and

http://test.datriware.com/sm2.jpg
http://test.datriware.com/mm2.jpg

---

Linear movement is good, but sometimes you can see two points on each side of movement. So movement where GG never stop is better. With Nikon GG you can go 3mm eccentric without any problems... With beattie never, but we tested 0.2mm and its fine.

Too tired today... see ya
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Last edited by Daves Spi; May 23rd, 2005 at 02:21 AM.
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Old May 22nd, 2005, 04:22 PM   #29
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hmmm......these pictures seem rather familiar.....hmmmm .... where did I see something like that before?....... you are there! Bravo.
Are you happy with the image? Is there anything better that you can think of? (now, after seeing IT first hand?)

Are you asking in fact how come Beattie is still in business while Nikon makes focusing screens? hmmm......(-ovarB).
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Old May 23rd, 2005, 02:40 AM   #30
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Quote:
Originally Posted by Dan Diaconu
Are you happy with the image? Is there anything better that you can think of? (now, after seeing IT first hand?)
I'm never happy with what I gain, because everytime there is something, what can be better ;-)

Now, after seeing this Im thinking of your words: "The image captured from GG is so good, as the primary lens are..." - Do I have to make another test with my $30 Takumar 70-200mm against some $500 Zeiss ?! ... :-)

Another issue is the oscilating GG. Our 3rd version produced the images I posted previously. But... Have some disadvantages. We are thinking about combine our 2nd with 3rd together :) Maybe we need someone to kick us the right way... Kick us :-)

Quote:
Originally Posted by Dan Diaconu
Are you asking in fact how come Beattie is still in business while Nikon makes focusing screens? hmmm......(-ovarB).
I'm not asking anything... I just tried to show to everyone the difference between maxwell and nikon ($150 and $10) - if any. Or in other hand, I showed, that $10 focusing screen can produce good image. Color abberation is caused by condenser, which is terrible (Used in photo enlarger).
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