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calvin83
Joined: 12 Apr 2009 Posts: 7553 Location: Hong Kong
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Posted: Fri May 29, 2015 4:50 am Post subject: The Lomography New Petzval 58 Bokeh Control Art Lens |
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calvin83 wrote:
https://www.kickstarter.com/projects/lomography/the-lomography-new-petzval-58-bokeh-control-art-le _________________ https://lensfever.com/
https://www.instagram.com/_lens_fever/
The best lens is the one you have with you. |
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Snodge
Joined: 01 Jan 2015 Posts: 163 Location: Bristol, UK
Expire: 2016-12-27
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Posted: Fri May 29, 2015 7:32 am Post subject: |
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Snodge wrote:
It seems to me a bit pointless when we've got the Helios 44-2 range of lenses, a lot cheaper too...! _________________ Hugh
Camera bodies: Fujifilm X-E3 (digital), Praktika Super TL1000 (35mm film), Kershaw 450 (medium format 6x6 folder)
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ZoneV
Joined: 09 Nov 2009 Posts: 1633 Location: Germany
Expire: 2011-12-02
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Posted: Fri May 29, 2015 8:13 am Post subject: |
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ZoneV wrote:
I think this new lens could generate swirl easier than the Helios 44, and likely even easier than with the Helios 40 too.
For me this new lens is a good idea. I have thought about DIY building a dedicated lens for controlable swirling images too, but not much proceeded. I used a LOMO KO-120M petzval projector lens and changed distance between front and back group with those simple ectension tubes, this changed the image effects, but image quality got down to much too.
Other experiments where with additional iris on other lenses, this way I want to tst further. _________________ Camera modification, repair and DIY - some links to look through: http://www.4photos.de/camera-diy/index-en.html
I AM A LENS NERD!
Epis, Elmaron, Emerald, Ernostar, Helioplan and Heidosmat.
Epiotar, Kameraobjektiv, Anastigmat, Epis, Meganast, Magnagon, Quinar, Culmigon, Novotrinast, Novflexar, Colorplan, Sekor, Kinon, Talon, Telemegor, Xenon, Xenar, Ultra, Ultra Star. Tessar, Janar, Visionar, Kiptar, Kipronar and Rotelar.
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dan_
Joined: 05 Dec 2012 Posts: 1055 Location: Romania
Expire: 2016-12-19
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Posted: Fri May 29, 2015 8:27 am Post subject: |
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dan_ wrote:
Looking at the cross-section diagram it it's not a classical Petzval but a kind of reversed Petzval. If the color of the glass in the cross-section diagram reflects the type of the glass used then it's not a Petzval, but a kind of "Petzal type" lens.
Anyway, the swirl control obtained by enlarging the space between the 2 lenses in the front group is, IMO, a nice thing to have and the FL is very convenient for both FF and APS-C. formats. |
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dan_
Joined: 05 Dec 2012 Posts: 1055 Location: Romania
Expire: 2016-12-19
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Posted: Fri May 29, 2015 8:55 am Post subject: |
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dan_ wrote:
ZoneV wrote: |
I think this new lens could generate swirl easier than the Helios 44, and likely even easier than with the Helios 40 too.
For me this new lens is a good idea. I have thought about DIY building a dedicated lens for controlable swirling images too, but not much proceeded. I used a LOMO KO-120M petzval projector lens and changed distance between front and back group with those simple ectension tubes, this changed the image effects, but image quality got down to much too.
Other experiments where with additional iris on other lenses, this way I want to tst further. |
I did some Petzval experiments, too. In my experiments the conclusions were:
-Additional irises on the component lenses (cardboard openings), only decreased the swirl to some level (no swirl increase) and, sometimes, acted as a diaphragm.
-Changing the distances between the front and the rear groups changed, to some degree, the FL and the level of sharpness.
-Reversing one lens or the entire rear group changed the character of the Bokeh very much but at the cost of a lower IQ.
Anyway, I finally figured out a way to control and add to some extent swirly Bokeh to most lenses, not only Petzvals. If there is enough demand I could try, after further refining it (still a lot of testing to do), to post the project on Kickstarter for a limited production.
But I'm afraid the level of demand is not encouraging... |
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bernhardas
Joined: 01 Jan 2013 Posts: 1432
Expire: 2017-05-23
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Posted: Sat May 30, 2015 11:33 am Post subject: |
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bernhardas wrote:
edited
Last edited by bernhardas on Wed Apr 06, 2016 7:24 am; edited 1 time in total |
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fermy
Joined: 17 Feb 2012 Posts: 2877
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Posted: Mon Jun 01, 2015 3:27 am Post subject: |
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fermy wrote:
The wide angle Minolta with field curvature control is this one: http://www.rokkorfiles.com/24mm%20VFC.htm - W.Rokkor 24mm f2.8 VFC
This new Petzval lomography lens is unfortunately yet another fashion rather than photographic item from lomography. With rack focusing and Waterhouse stops it will be very inconvenient to photograph with, so it will mostly sit pretty on display shelves. _________________ Many lenses and some film bodies for sale here: http://forum.mflenses.com/canon-fd-minolta-md-c-mounts-m42-pentax-and-more-t50465.html
Flickr http://www.flickr.com/photos/96060788@N06/ |
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