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meanwhile
Joined: 29 May 2014
Posts: 225
Location: Australia
Expire: 2016-11-28
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 Posted: Thu Jan 07, 2016 9:08 pm Post subject: |
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meanwhile wrote:
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| Obviously it is not a toy to be improvised with some cheap lenses in a few hours. |
The person who says something is impossible should not interrupt the person who is doing it.
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In my bag: Sony A7II - Olympus OM 21mm f/3.5 - Minolta M-Rokkor 40mm f/2.0 - Konica Hexanon 57mm f/1.2 AR - Olympus Zuiko OM 100mm f/2.8 - Pentax 135mm f/3.5 |
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CuriousOne
Joined: 31 Dec 2013
Posts: 669
Location: Home
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| Posted: Thu Jan 07, 2016 9:14 pm Post subject: |
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CuriousOne wrote:
Haha thanks, nice phrase!
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Gerald
Joined: 25 Mar 2014
Posts: 1196
Location: Brazil
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| Posted: Thu Jan 07, 2016 9:24 pm Post subject: |
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Gerald wrote:
| meanwhile wrote: |
| Quote: |
| Obviously it is not a toy to be improvised with some cheap lenses in a few hours. |
The person who says something is impossible should not interrupt the person who is doing it. |
Yes, keep trying, buddies! 
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If raindrops were perfect lenses, the rainbow did not exist. |
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meanwhile
Joined: 29 May 2014
Posts: 225
Location: Australia
Expire: 2016-11-28
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| Posted: Thu Jan 07, 2016 10:06 pm Post subject: |
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meanwhile wrote:
The results that have come from perpetual motion research far outweigh the efforts that have gone into it.
Plus, you misinterpreted. He already *is* doing it.
He's not trying to do it, he has a working prototype already.
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In my bag: Sony A7II - Olympus OM 21mm f/3.5 - Minolta M-Rokkor 40mm f/2.0 - Konica Hexanon 57mm f/1.2 AR - Olympus Zuiko OM 100mm f/2.8 - Pentax 135mm f/3.5 |
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CuriousOne
Joined: 31 Dec 2013
Posts: 669
Location: Home
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| Posted: Fri Jan 08, 2016 9:34 am Post subject: |
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CuriousOne wrote:
Here's same different color gels, but this time, ground glass removed. You can clearly see the shape of flash tube on the wall:
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DConvert
Joined: 12 Jun 2010
Posts: 921
Location: Essex UK
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| Posted: Fri Jan 08, 2016 5:01 pm Post subject: |
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DConvert wrote:
Isn't the purpose of the ground glass specifically to act as a diffuser??? |
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kds315*
Joined: 12 Mar 2008
Posts: 16651
Location: Weinheim, Germany
Expire: 2021-03-09
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| Posted: Fri Jan 08, 2016 5:06 pm Post subject: |
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kds315* wrote:
Guys, please stay away from emotional comments and stay purely on the subject :pleeeze:
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Klaus - Admin
"S'il vient a point, me souviendra" [Thomas Bohier (1460-1523)]
http://www.macrolenses.de for macro and special lens info
http://www.pbase.com/kds315/uv_photos for UV Images and lens/filter info
https://www.flickr.com/photos/kds315/albums my albums using various lenses
http://photographyoftheinvisibleworld.blogspot.com/ my UV BLOG
http://www.travelmeetsfood.com/blog Food + Travel BLOG
https://galeriafotografia.com Architecture + Drone photography
Currently most FAV lens(es):
X80QF f3.2/80mm
Hypergon f11/26mm
ELCAN UV f5.6/52mm
Zeiss UV-Planar f4/60mm
Zeiss UV-Planar f2/62mm
Lomo Уфар-12 f2.5/41mm
Lomo Зуфар-2 f4.0/350mm
Lomo ZIKAR-1A f1.2/100mm
Nikon UV Nikkor f4.5/105mm
Zeiss UV-Sonnar f4.3/105mm
CERCO UV-VIS-NIR f1.8/45mm
CERCO UV-VIS-NIR f4.1/94mm
CERCO UV-VIS-NIR f2.8/100mm
Steinheil Quarzobjektiv f1.8/50mm
Pentax Quartz Takumar f3.5/85mm
Carl Zeiss Jena UV-Objektiv f4/60mm
NYE OPTICAL Lyman-Alpha II f1.1/90mm
NYE OPTICAL Lyman-Alpha I f2.8/200mm
COASTAL OPTICS f4/60mm UV-VIS-IR Apo
COASTAL OPTICS f4.5/105mm UV-Micro-Apo
Pentax Ultra-Achromatic Takumar f4.5/85mm
Pentax Ultra-Achromatic Takumar f5.6/300mm
Rodenstock UV-Rodagon f5.6/60mm + 105mm + 150mm
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CuriousOne
Joined: 31 Dec 2013
Posts: 669
Location: Home
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| Posted: Sat Jan 09, 2016 10:34 am Post subject: |
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CuriousOne wrote:
Yes of course, ground glass is a diffuser element, I just tried to go without it - to see how things look. And they look terribly 
P.S. halogen modeling lamps are very bad guys, I already cracked one ground glass due to excess heat from modeling lamp. Now installed IR blocking glass, let's see how it will work.
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CuriousOne
Joined: 31 Dec 2013
Posts: 669
Location: Home
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| Posted: Thu Jan 21, 2016 7:41 pm Post subject: |
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CuriousOne wrote:
Goodies arrived, and way better results achieved
1. Halogen modeling lamp replaced by LED - much brighter, much whiter, much much less heat.
2. Got condenser assembly from an old medium format slide projector - much better than ground glass.
3. A lot of 3 projection TV lens arrived - also a great improvement in light transmission.
Here how it will look - a sheet of paper shows the area, where stencils will be placed.
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bernhardas
Joined: 01 Jan 2013
Posts: 1432
Expire: 2017-05-23
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| Posted: Fri Jan 22, 2016 1:21 am Post subject: |
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bernhardas wrote:
edited
Last edited by bernhardas on Sat Apr 09, 2016 5:53 am; edited 1 time in total |
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CuriousOne
Joined: 31 Dec 2013
Posts: 669
Location: Home
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| Posted: Fri Jan 22, 2016 4:47 am Post subject: |
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CuriousOne wrote:
Thanks for suggestions. I prefer to use studio strobes - for higher power and larger projected image area. For example, the above shown setup projects image with diameter of 2 meters, with brightness enough for ISO 100 @ F11. I don't think, on camera flashes can handle that.
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CuriousOne
Joined: 31 Dec 2013
Posts: 669
Location: Home
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| Posted: Fri Jan 22, 2016 2:12 pm Post subject: |
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CuriousOne wrote:
Almost did a critical error
Everything working so fine with the modeling light, that I was about to call for models and arrange a session. But then I've tried using flash itself, not modeling lamp
Long story short, projector condenser is designed for point light source - light bulb. It is not suited for circular light source, which is the flash bulb in studio lights. So condenser has to gone, and ground glass - welcome back
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CuriousOne
Joined: 31 Dec 2013
Posts: 669
Location: Home
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| Posted: Tue Jan 26, 2016 7:35 am Post subject: |
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CuriousOne wrote:
Everything goes just fine. Now system accepts Cokin "A" size filters/stencils, and all I need to do is to manufacture cover, to avoid light spillage.
The picture is made at 1/160, ISO100, F11, light source is 4 meters away from the wall, using 120ws strobe at 3/4 power and projection TV lens (78mm F0.9). Stencil diameter is 35mm, and as you can see by light overspill, it can be increased to at least 40-45mm.
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CuriousOne
Joined: 31 Dec 2013
Posts: 669
Location: Home
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| Posted: Wed Jan 27, 2016 7:46 pm Post subject: |
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CuriousOne wrote:
You know what is fun? The fact that things I call "stencils" are called "gobo" in lighting word
Further advancements:
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CuriousOne
Joined: 31 Dec 2013
Posts: 669
Location: Home
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| Posted: Sun Feb 07, 2016 9:03 am Post subject: |
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CuriousOne wrote:
Device is 90% complete (planning to add tilt adapter, to correct geometric distortions from sideways projection).
Here's sample (please disregard pose, framing, etc. this was shot just for illustration purposes).
The background is illuminated by 120ws strobe at full power. Front is illuminated by 200ws strobe at 1/4 power, 120cm octagon softbox
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