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Old April 30th, 2007, 03:31 PM   #1
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spinning diy adapter video

adapter has a spinning disc, +1, +2, +3 macro and a small achromatic lens.

what do you think about the result? maybe i should try to find a better achromaticlens? or will using one +7 macro be better than using +1, +2, +3

16mb quicktime movie
http://students.sabanciuniv.edu/~hurcan/35mmtryout.mov
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Old April 30th, 2007, 05:45 PM   #2
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Hurcan:

I've got to say, you did a pretty nice job just with those lenses-- particularly preventing sharpness fall of at the edges. When you described set up in post, I was expecting some messy stuff..... Not sure if a plus 7 will change anything that much. I had a plus 10, that got really soft around edges.

Got a picture of your self built unit... Don't be shy !
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Old May 1st, 2007, 09:23 AM   #3
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very nice...what are you using for GG and what kind of achromat are you using? pix of the unit?
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Old May 1st, 2007, 12:27 PM   #4
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my gg is grinded plastic that i took out from a cd case (thanks to Ettore Giraldi for the idea)
im using an achromatic lens that came out from an old binocular

here is an other video footage that i tested my 70/300 canon photo lens:
(7mb quicktime)
http://students.sabanciuniv.edu/~hur...canon_lens.mov

and here is the images of my setup (don't laugh!!) it's in the development procces thats why the parts are too scatchy :D .

http://students.sabanciuniv.edu/~hurcan/1.jpg
http://students.sabanciuniv.edu/~hurcan/2.jpg
http://students.sabanciuniv.edu/~hurcan/3.jpg
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Old May 1st, 2007, 01:17 PM   #5
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Those are some stunning results for a such a ghetto rigged setup. I'm very very impressed.
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Old May 1st, 2007, 01:42 PM   #6
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I agree, the footage is very crisp for the 'ghetto' setup.

Only real issue that stands out is the CA which is probably from the achromat you are using.

Well done, its downhill from here :)
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Old May 2nd, 2007, 10:45 PM   #7
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I love the toxic acrid smell of freshly hacksawed PVC pipe in the morning.

Hurcan. If you look through your hardware supplier's stock, you may find end caps for PVC pipe which are of thin walled material. There are two styles.

One is a thick material designed to withstand operating pressure. The thin walled caps are called dust caps in Australia. The thickness of these is exactly the thickness of the lug channel in the FX1/Z1P lens hood bayonet mount. All that is needed is to file out the hole and the gaps for the lugs.

Towards the end of this clip -

http://www.youtube.com/watch?v=CnweOEEqlRY

- you will see what I used and what I did. In this specimen, the cap is larger and the centre is offset because I used prisms and an offset path within a larger diameter tube.

Last edited by Bob Hart; May 2nd, 2007 at 10:48 PM. Reason: added text
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Old May 14th, 2007, 08:06 AM   #8
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Thanks for the info. I have been trying to find the parts you used in your adapter but i couldn't find the one that fits fx1. Maybe we have different pipe sizes in Turkey :)

Here is a new video. (that's about the city im living, "Istanbul")
http://students.sabanciuniv.edu/~hurcan/al/istanbul.mov
(34mb quicktime)
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Old August 7th, 2007, 01:13 PM   #9
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update

shot taken with new achromatic lens using 28-80 f3.5/4.5 canon slr lens

http://students.sabanciuniv.edu/~hur...8_80_canon.mov

10mb quicktime

i acheaved acromatic color disortion free images. However i still need to make a proper gg to avoid ghosting. as you see
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Old August 8th, 2007, 10:59 PM   #10
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Your bokeh looks pretty good, but you can see the arcing grain (shot of sky... stopped down too much?
Were you shooting wide open with that f3.5/4.5?

What do you mean by "ghosting"? I didn't see any double images.
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Old August 10th, 2007, 07:44 PM   #11
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the grain is probably becouse of the gg im using i touched it too much so i probably need to make a cleaner one.

by ghosting what i ment was the lack of sharpness and contrast :D

the lens has not got a diaphragm control on it so i think it is wide open 3.5 probably and when you zoom to 80 it becomes 4.5


and here are some more frame grabs but i still have a stabilty problem which makes it hard to adjust the adapter

http://students.sabanciuniv.edu/~hurcan/al/al2/1.jpg
http://students.sabanciuniv.edu/~hurcan/al/al2/2.jpg
http://students.sabanciuniv.edu/~hurcan/al/al2/3.jpg
http://students.sabanciuniv.edu/~hurcan/al/al2/4.jpg
http://students.sabanciuniv.edu/~hurcan/al/al2/5.jpg
http://students.sabanciuniv.edu/~hurcan/al/al2/6.jpg
http://students.sabanciuniv.edu/~hurcan/al/al2/7.jpg
http://students.sabanciuniv.edu/~hurcan/al/al2/8.jpg

Last edited by Hurcan Emre; August 10th, 2007 at 11:55 PM.
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Old August 24th, 2007, 12:46 PM   #12
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here is the farthest point i could get:
http://students.sabanciuniv.edu/~hurcan/al/movmov.mov
19.3mb quicktime
caps:
http://students.sabanciuniv.edu/~hurcan/al/ayakkabi.jpg

http://students.sabanciuniv.edu/~hurcan/al/stun.jpg

no choromating abaration
no ghosting
just a little bit vignating which is the sideefect of using a 4.5f lens (and can easly be solved by using an condenser lens)
*some flickering (should be solved but don't know how)
*gg noise in sun light (should be solved but don't know how

*some suggestions please

Last edited by Hurcan Emre; August 24th, 2007 at 04:26 PM.
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Old August 24th, 2007, 01:57 PM   #13
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Your f4.5 lens is likely to be a part of your problem.

Grain will be there in all adaptors, some more than others. Sometimes grain comes from the camera itself when the video gain is switched in.

Flicker can come from marks and uneven finish on the disk. A narrow lens aperture can make it much worse. If you have no f1.8 lens, maybe go to a camera store and ask to test a lens on your device in the store. You should observe an improvement.

I have a Nikon f4 zoom lens. It causes flicker outdoors in bright sunlight on a good glass disk I have made. There is no flicker with the f1.8 lenses. One lens which is f2.8 does not flicker but has corner brightness falloff.

Last edited by Bob Hart; August 24th, 2007 at 02:05 PM. Reason: error
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Old August 24th, 2007, 04:13 PM   #14
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thanks for the reply.

i have one 50mm 1.2f lens but when i have to shoot wide i have to use my old 18*80mm lens. maybe i should find a wide lens with a fixed focal lenght(maybe 20mm with a 2.8f at least)

i will try to make a better(or evener) gg so i may be able to avoid flickering.

thanks again
have a nice day.
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Old August 26th, 2007, 05:40 PM   #15
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new video with new gg and some color grading tryouts.

http://students.sabanciuniv.edu/~hurcan/al/eller.mov

10mb quicktime
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