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Igor
Joined: 13 Jan 2014 Posts: 520 Location: United States and Ukraine, Europe
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Posted: Thu Sep 18, 2014 8:52 am Post subject: |
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Igor wrote:
great results ! #2 and 3 are very good ! looks like your lens is sharper than mine |
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enzodm
Joined: 11 Sep 2010 Posts: 350 Location: Italy
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Posted: Thu Sep 18, 2014 9:01 am Post subject: |
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enzodm wrote:
Igor wrote: |
great results ! #2 and 3 are very good ! looks like your lens is sharper than mine |
well, if you had to add contrast and so, there is indeed some difference, because I don't think is needed with my copy. Maybe also interaction with full frame could be an issue? _________________
Canon 60D, Tamron 17-50VC, Canon 55-250IS, Sigma 50-150/2.8 plus:
Wide: Mir 20/3.5, Kenlock 24/2.8, Tamron 28/2.5, Yashikor 35/2.8, Mir 37/2.8
Fifties: Voigtländer Color Ultron 50/1.8, Pentacon 50/1.8, Zenitar 50/1.9, Leica Summicron 50/2, CZJ Pancolar 50/2, CZJ Tessar 50/2.8, Industar 50/3.5 , Rikenon 55/1.4, Petri 55/1.8, Helios 58/2
In the middle: Cyclop 85/1.5, Nikon 100/2.8
135s: Tamron 135/2.5, CZJ Sonnar 135/3.5, Jupiter 135/3.5, CZJ Triotar 135/4, Tamron Twin Tele 135-225
Tele: Soligor 200/2.8, Pentax Super Takumar 200/4, Hanimex 400/6.3, Makinon 500/8
Various: Schneider-Kreuznach Componar 135/4.5, Tominon 105/4.5, Vest Pocket Kodak meniscus, Wray Supar 2"/4.5
Sony Nex 6 plus:
Industar 69 28/2.8, Fujian 35/1.7, Rokkor 50/1.4, Jupiter 50/2, Cosmicar 50/2.8, Industar-22 50/3.5, Leitz Elmar 90/4, Canon Serenar 100/4
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enzodm
Joined: 11 Sep 2010 Posts: 350 Location: Italy
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Posted: Fri Sep 19, 2014 8:48 am Post subject: |
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enzodm wrote:
Ok, no strange tints
_________________
Canon 60D, Tamron 17-50VC, Canon 55-250IS, Sigma 50-150/2.8 plus:
Wide: Mir 20/3.5, Kenlock 24/2.8, Tamron 28/2.5, Yashikor 35/2.8, Mir 37/2.8
Fifties: Voigtländer Color Ultron 50/1.8, Pentacon 50/1.8, Zenitar 50/1.9, Leica Summicron 50/2, CZJ Pancolar 50/2, CZJ Tessar 50/2.8, Industar 50/3.5 , Rikenon 55/1.4, Petri 55/1.8, Helios 58/2
In the middle: Cyclop 85/1.5, Nikon 100/2.8
135s: Tamron 135/2.5, CZJ Sonnar 135/3.5, Jupiter 135/3.5, CZJ Triotar 135/4, Tamron Twin Tele 135-225
Tele: Soligor 200/2.8, Pentax Super Takumar 200/4, Hanimex 400/6.3, Makinon 500/8
Various: Schneider-Kreuznach Componar 135/4.5, Tominon 105/4.5, Vest Pocket Kodak meniscus, Wray Supar 2"/4.5
Sony Nex 6 plus:
Industar 69 28/2.8, Fujian 35/1.7, Rokkor 50/1.4, Jupiter 50/2, Cosmicar 50/2.8, Industar-22 50/3.5, Leitz Elmar 90/4, Canon Serenar 100/4
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Igor
Joined: 13 Jan 2014 Posts: 520 Location: United States and Ukraine, Europe
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Posted: Fri Sep 19, 2014 8:59 am Post subject: |
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Igor wrote:
great bokeh ! |
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alex ph
Joined: 16 Mar 2013 Posts: 1571
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Posted: Tue Apr 28, 2015 6:18 pm Post subject: |
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alex ph wrote:
Guys, I am confused. Received that projector lens (Bell & Howell 51mm f1.2) and can have an image in focus at a distance greater than 20cm if only touch the interior of my NEX-5N with the back glass of the lens. How did you manage to make your images, the great topic starter's portrait, those of children or of the rose, at a distance which seems to be 1.5 meter and more?
Here is a sample with a custom adapter, flange distance at around 30mm:
And here is a sample of the maximum protrusion into the NEX body when the lens barely touches the sensor, so the flange distance is around 3-5mm:
The magenta light "leak" comes from the hole which remains when you insert the lens directly to the body.
How could the flange distance be less than 5mm for a lens destined for 16mm film projection?
Otherwise the image delivered by the lens is a real pleasure. |
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alex ph
Joined: 16 Mar 2013 Posts: 1571
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Posted: Tue Apr 28, 2015 6:38 pm Post subject: |
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alex ph wrote:
Found another topic about the lens here in the forum: http://forum.mflenses.com/bell-and-howell-2-inch-1-2-projector-lens-t65738.html. But the images in the post must be lost in the last server crash. So your helpful explanations will be highly appreciated! |
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Igor
Joined: 13 Jan 2014 Posts: 520 Location: United States and Ukraine, Europe
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Posted: Tue Apr 28, 2015 7:08 pm Post subject: |
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Igor wrote:
Hi Alex, I don't remember exactly how far was the back element from the A7R sensor, but pretty close for sure. If memory serves me well the max focusing distance was about 1.5m ... that's all I can tell, ... sorry have no idea why your lens doesn't focus further. |
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madtigerhide
Joined: 26 Jul 2014 Posts: 15
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Posted: Sun Jan 08, 2017 7:37 pm Post subject: |
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madtigerhide wrote:
I noticed a yellow tint to the front element. does anyone know if this lens is thorium coated and hence radioactive? (A good number of wide aperture lenses of the same period were quite radioactive). Thanks |
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kds315*
Joined: 12 Mar 2008 Posts: 16497 Location: Weinheim, Germany
Expire: 2021-03-09
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Posted: Sun Jan 08, 2017 7:58 pm Post subject: |
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kds315* wrote:
madtigerhide wrote: |
I noticed a yellow tint to the front element. does anyone know if this lens is thorium coated and hence radioactive? (A good number of wide aperture lenses of the same period were quite radioactive). Thanks |
"Thorium coated" does not exist, it was used as an add on to the glass mix to achieve a higher refaction index. _________________ 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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madtigerhide
Joined: 26 Jul 2014 Posts: 15
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Posted: Sun Jan 08, 2017 8:13 pm Post subject: |
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madtigerhide wrote:
Thanks for the technical clarification. Is it radioactive though? Thanks |
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y
Joined: 11 Aug 2013 Posts: 304 Location: EU
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Posted: Sun Jan 08, 2017 8:51 pm Post subject: |
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y wrote:
madtigerhide wrote: |
Thanks for the technical clarification. Is it radioactive though? Thanks |
Bell & Howell apparently used Thorium in their production. There might be a mention of 51/1.2's radioactivity on the net. However, the safest bet is to buy yourself a geiger counter and simply measure it |
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madtigerhide
Joined: 26 Jul 2014 Posts: 15
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Posted: Sun Jan 08, 2017 11:09 pm Post subject: |
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madtigerhide wrote:
Yeah seems the case from what I read, hoped I could find some golden nuggets of info in here about this specific lens though |
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pdccameras
Joined: 23 Aug 2009 Posts: 826 Location: Putnam, CT
Expire: 2014-08-11
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Posted: Sun Jan 15, 2017 3:16 am Post subject: |
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pdccameras wrote:
HI all,
Here are two from my copy of the B&H 2 in. F/1.2 shot on a Sony A7II. This is a fun lens!
#1
#2
_________________ Canon 5D Mii, Canon 40D, Canon 350D IR, Sony A7 Mii, Sony Alpha-6000, a ton of lenses: AF & MF and too many cameras to count, all formats: 110 - 4x5. |
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