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iangreenhalgh1
Joined: 18 Mar 2011 Posts: 15685
Expire: 2014-01-07
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Posted: Mon May 30, 2022 5:04 pm Post subject: Epson f1.85 16.6mm projector lens of Olympus OM-D E-M5 |
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iangreenhalgh1 wrote:
I removed this lens from an Epson DLP projector, and to be honest, the results are rather poor. It's sharp in the centre but has smeary edges and the whole frame is veiled by a strong diffuse glow. This makes the images produced somewhat characterful but also poor in technical quality.
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_________________ I don't care who designed it, who made it or what country it comes from - I just enjoy using it! |
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iangreenhalgh1
Joined: 18 Mar 2011 Posts: 15685
Expire: 2014-01-07
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Posted: Mon May 30, 2022 7:46 pm Post subject: |
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iangreenhalgh1 wrote:
The barrel could be unscrewed into two halves, so I fitted a crude cardboard aperture disc, roughly f4 I think, to see if it improved the IQ by much.
It did, the diffuse glow is gone, it's now a decent lens.
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_________________ I don't care who designed it, who made it or what country it comes from - I just enjoy using it! |
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eggplant
Joined: 27 May 2020 Posts: 516
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Posted: Mon May 30, 2022 8:40 pm Post subject: |
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eggplant wrote:
I bought a box of ten identical digital projection lenses with a practically identical focal length, but abit faster (f1.6) - but turned out to be almost distortionless, and completely consistent across APS-C frame and barely any vignetting to boot. Sharpness is good when focus is nailed but undercorrected spherical aberration appears if you miss it.
I hadn't posted about it yet because I hadn't perfectly centered the mount (mask on front lens causes vignetting), but for proving the point that you can get good luck, I'll post anyway:
100% corner crop shows sharpness:
The bokeh on this lens is buttery smooth, way better than the 35mm SLR ultrawides I've tested. The low optical vignetting makes for nice, clean rendering.
Here is a background crop, first off Tokina AT-X 17mm f3.5 wide open
Now this projection lens
The mask:
It's long, all metal and glass which means it weighs 1kg(!) - I haven't taken it out since testing it once adapted. I should probably get some more samples... |
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kiddo
Joined: 29 Jun 2018 Posts: 1101
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Posted: Mon May 30, 2022 8:54 pm Post subject: |
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kiddo wrote:
Taht cardboard did really improve a lot, I've always wanted to do that to the colorplan ,just had no time yet , and still ,can't recall seeing anyone do it before |
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iangreenhalgh1
Joined: 18 Mar 2011 Posts: 15685
Expire: 2014-01-07
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Posted: Mon May 30, 2022 9:07 pm Post subject: |
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iangreenhalgh1 wrote:
The cardboard disk trick usually works.
Nice work on that ultrawide, I've got an 8mm and a 9mm I removed from data projectors and they work as you say - distortionless, plenty of sharpness, no vignetting, the only issue is a bit of uncorrect SA and some CA on the highest contrast edges, but a bit of PP ccan fix both issues.
Here's a couple of shots taken this weekend with the 9mm on my OM-D E-M5.
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_________________ I don't care who designed it, who made it or what country it comes from - I just enjoy using it! |
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kathala
Joined: 13 May 2022 Posts: 128
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Posted: Tue May 31, 2022 9:27 am Post subject: |
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kathala wrote:
I really like the rendition of the lens. It should be perfect for scenic portraits - also in focal length.
And it seems to clean up nicely in post:
[url=http://forum.mflenses.com/userpix/20225/big_12143_4077_P1010146_1_1.jpg][img]http://forum.mflenses.com/userpix/20225/12143_4077_P1010146_1_1.jpg[/img][/url] _________________ Photography Reference Tables:
drive.google.com/drive/folders/1aJ5F8XM6t5AK4bydthcDoiwhsh5CUx3N
My Art and Books: ChristianSchnalzger.de
My Exploration of Panoramic Photographic Storytelling:
flickr.com/photos/hach_und_ueberhaupt/
The better you look, the more you see (B. E. Ellis) |
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RokkorDoctor
Joined: 27 Nov 2021 Posts: 1250 Location: Kent, UK
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Posted: Tue May 31, 2022 1:18 pm Post subject: |
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RokkorDoctor wrote:
Surprised they work as well as they do; projector lenses are usually designed in conjunction with the condensor of the illumination system which (generally speaking) projects an image of the light source in or near the optical centre of the projector lens hence no adjustable aperture (it wouldn't do much really). The illumination when used as a photograpic lens is quite different to what they were designed for and therefore the addition of an aperture quite beneficial... _________________ Mark
SONY A7S, A7RII + dust-sealed modded Novoflex/Fotodiox/Rayqual MD-NEX adapters
Minolta SR-1, SRT-101/303, XD7/XD11, XGM, X700
Bronica SQAi
Ricoh GX100
Minolta majority of all Rokkor SR/AR/MC/MD models made
Sigma 14mm/3.5 for SR mount
Tamron SP 60B 300mm/2.8 (Adaptall)
Samyang T-S 24mm/3.5 (Nikon mount, DIY converted to SR mount)
Schneider-Kreuznach PC-Super-Angulon 28mm/2.8 (SR mount)
Bronica PS 35/40/50/65/80/110/135/150/180/200/250mm |
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iangreenhalgh1
Joined: 18 Mar 2011 Posts: 15685
Expire: 2014-01-07
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Posted: Tue May 31, 2022 3:29 pm Post subject: |
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iangreenhalgh1 wrote:
Indeed, the use as a taking lens is rather different to their original application, luckily used projectors cost next to nothing so it's not much of an investment to play around with these lenses.
BTW I made a small error, the lens is actual f1.44, not f1.85. _________________ I don't care who designed it, who made it or what country it comes from - I just enjoy using it! |
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iangreenhalgh1
Joined: 18 Mar 2011 Posts: 15685
Expire: 2014-01-07
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Posted: Thu Jun 02, 2022 9:43 am Post subject: |
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iangreenhalgh1 wrote:
Here's how I fitted the aperture disk, dead easy because the lens barrel is in two halves and can just be unscrewed. I used thick black plastic and then sanded it to remove the glossy surface and reduce reflections.
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