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Mistral75 · 06-13-2016, 06:49 AM

Originally posted by clackers

Yep, because that's FA31 territory.

It would probably be odd if someone owned both those lenses, IMHO, with less than a stop between them.

It would, wouldn't it?

Bu the way, there is a bit more than one stop between f/1.2 and f/1.8: f/1.2 ÷ √2 ≈ f/1.7.

panoguy · 06-13-2016, 06:54 AM

Originally posted by clackers

Yep, because that's FA31 territory.

It would probably be odd if someone owned both those lenses, IMHO, with less than a stop between them.

When I had the FA 31mm, I never shot it at 1.8 because it also "glowed" and had tremendous CA wide open (but IIRC didn't fringe as bad as the 77). Of course, the FA = AF (palindrome) and smaller and lighter.

The Kerlee 35/1.2 has aperture click-stops (when enabled) at 1.2, 1.4, 1.6 (unlabeled, but midway), 1.8, 2, 2.4 (unlabeled), 2.8 etc. so "stopping down" to 1.8 is easy enough. Honestly, I wouldn't use this lens wide open unless I really had to, just like the FA Ltds. The DA 35 Macro Ltd is an exception to that... and an unfair comparison for any 35mm IMHO.

**clackers** · 06-13-2016, 07:08 AM

Originally posted by Mistral75

It would, wouldn't it?

Exactly. LBA is an illness listed in the DSM, Mistral!

Originally posted by Mistral75

Bu the way, there is a bit more than one stop between f/1.2 and f/1.8: f/1.2 ÷ √2 ≈ f/1.7.

Yes, you're right ... it's significant.

Edit: I really mean that ... a doubling of any quantity in photography usually is!

**BigMackCam** · 06-13-2016, 07:13 AM

Originally posted by clackers

Yes, you're right ... it's significant.

leekil · 06-13-2016, 10:13 PM

The question is, how close to the f1.2 do you get with a DSLR? A couple years ago there was some discussion about how the various camera manufacturers kind of fudged the exposure at the very large apertures; you don't really get f1.2 worth of light at the sensor due to the angle of the light hitting the sensor. I did a couple tests with f1.2, and it seemed to indicate the same thing. Will you really get the light-gathering advantage of f1.2 from this lens, not on a film camera?

Lee

Mistral75 · 06-14-2016, 01:24 AM - **1 Like**

Some 1.5 Mpix pictures from the official website.

Nikon D800

http://www.dzoptics.com/uploads/yp/yp10.jpg

http://www.dzoptics.com/uploads/yp/yp15.jpg

http://www.dzoptics.com/uploads/yp/yp20.jpg

Sony Alpha 7R

http://www.dzoptics.com/uploads/yp/yp24.jpg

http://www.dzoptics.com/uploads/yp/yp25.jpg

http://www.dzoptics.com/uploads/yp/yp28.jpg

http://www.dzoptics.com/uploads/yp/yp29.jpg

Na Horuk · 06-14-2016, 05:26 AM

Originally posted by leekil

I did a couple tests with f1.2, and it seemed to indicate the same thing. Will you really get the light-gathering advantage of f1.2 from this lens, not on a film camera?

But that is an industry problem, not a manufacturer problem. Its just something you have to accept if you want f1.4 or faster.
In general, the f-numbers have become a convention rather than accurate representations. T-numbers might be more accurate, but they are not as useful for photographers.

CarlG · 06-14-2016, 11:21 AM

Any information on availibility and price for us ordinary mortals?

Judy1111 · 06-16-2016, 01:52 AM - **1 Like**

found some comparison between pentax 31 and kerlee 35
left

entax 31; right:kerlee 35
???4?K1+?? 35 1.2 ??--????????
???5?K1+?? 35 1.2 ??--????????
???6?K1+?? 35 1.2 ??--????????

hinman · 06-16-2016, 03:46 AM - **1 Like**

Originally posted by Mistral75

Some 1.5 Mpix pictures from the official website.

Nikon D800

Sony Alpha 7R

Try to show images

i5_david · 06-16-2016, 09:45 AM

Originally posted by Judy1111

found some comparison between pentax 31 and kerlee 35
left

entax 31; right:kerlee 35
???4?K1+?? 35 1.2 ??--????????
???5?K1+?? 35 1.2 ??--????????
???6?K1+?? 35 1.2 ??--????????

Impressive. Like the Bokeh a lot!!! thanks for sharing

aurele · 06-16-2016, 01:08 PM

the rendering is quite good.

**Clarkey** · 06-20-2016, 08:29 PM

No pics from me - I think I was using the K-1 or Panoguy's body to shoot. For the record, I thought the lens balanced quite nicely on the end of the K-1, and was quite tactile to use. It was nice to have full 35mm semi-wide value back, the colour rendering seems more Sigma, than Pentax. That said, it seemed quite contrasty across the light from F4 onward.

I am surprised that we got anything in focus, given how hard it was blowing that day!

**Digitalis** · 06-20-2016, 09:14 PM

I see a contender for another test against my FA31mm f/1.8 - CA doesn't seem to be too bad, however the lower contrast @f/1.2 masks a lot of it. From the front focused f/8 "infinity" shot, resolution looks lower than that of the FA31.

**Clinton** · 06-23-2016, 05:45 PM

Well expletive, where do I buy this thing?

06-13-2016, 07:08 AM	#18
clackers Otis Memorial Pentaxian Join Date: Jul 2013 Location: Melbourne Photos: Albums Posts: 16,397	Originally posted by Mistral75 It would, wouldn't it? Exactly. LBA is an illness listed in the DSM, Mistral! Originally posted by Mistral75 Bu the way, there is a bit more than one stop between f/1.2 and f/1.8: f/1.2 ÷ √2 ≈ f/1.7. Yes, you're right ... it's significant. Edit: I really mean that ... a doubling of any quantity in photography usually is! Last edited by clackers; 06-13-2016 at 08:48 PM.

06-16-2016, 01:52 AM - 1 Like	#24
Judy1111 New Member Join Date: Jun 2016 Posts: 3	found some comparison between pentax 31 and kerlee 35 leftentax 31; right:kerlee 35 ???4?K1+?? 35 1.2 ??--???????? ???5?K1+?? 35 1.2 ??--???????? ???6?K1+?? 35 1.2 ??--????????

06-16-2016, 09:45 AM	#26
i5_david Veteran Member Join Date: Feb 2016 Posts: 332	Originally posted by Judy1111 found some comparison between pentax 31 and kerlee 35 leftentax 31; right:kerlee 35 ???4?K1+?? 35 1.2 ??--???????? ???5?K1+?? 35 1.2 ??--???????? ???6?K1+?? 35 1.2 ??--???????? Impressive. Like the Bokeh a lot!!! thanks for sharing

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06-13-2016, 06:49 AM	#16
Mistral75 Pentaxian Join Date: Feb 2009 Location: Paris, France Posts: 7,527 Original Poster	Originally posted by clackers Yep, because that's FA31 territory. It would probably be odd if someone owned both those lenses, IMHO, with less than a stop between them. It would, wouldn't it? Bu the way, there is a bit more than one stop between f/1.2 and f/1.8: f/1.2 ÷ √2 ≈ f/1.7.

06-13-2016, 06:54 AM	#17
panoguy Pentaxian Join Date: Sep 2007 Location: Washington, D.C. Photos: Gallery \| Albums Posts: 3,327	Originally posted by clackers Yep, because that's FA31 territory. It would probably be odd if someone owned both those lenses, IMHO, with less than a stop between them. When I had the FA 31mm, I never shot it at 1.8 because it also "glowed" and had tremendous CA wide open (but IIRC didn't fringe as bad as the 77). Of course, the FA = AF (palindrome) and smaller and lighter. The Kerlee 35/1.2 has aperture click-stops (when enabled) at 1.2, 1.4, 1.6 (unlabeled, but midway), 1.8, 2, 2.4 (unlabeled), 2.8 etc. so "stopping down" to 1.8 is easy enough. Honestly, I wouldn't use this lens wide open unless I really had to, just like the FA Ltds. The DA 35 Macro Ltd is an exception to that... and an unfair comparison for any 35mm IMHO.

06-13-2016, 07:13 AM	#19
BigMackCam Digitiser of Film Join Date: Mar 2010 Location: North East of England Posts: 20,706	Originally posted by clackers Yes, you're right ... it's significant.

06-13-2016, 10:13 PM	#20
leekil Pentaxian Join Date: May 2016 Photos: Albums Posts: 2,003	The question is, how close to the f1.2 do you get with a DSLR? A couple years ago there was some discussion about how the various camera manufacturers kind of fudged the exposure at the very large apertures; you don't really get f1.2 worth of light at the sensor due to the angle of the light hitting the sensor. I did a couple tests with f1.2, and it seemed to indicate the same thing. Will you really get the light-gathering advantage of f1.2 from this lens, not on a film camera? Lee

06-14-2016, 01:24 AM - 1 Like	#21
Mistral75 Pentaxian Join Date: Feb 2009 Location: Paris, France Posts: 7,527 Original Poster	Some 1.5 Mpix pictures from the official website. Nikon D800 http://www.dzoptics.com/uploads/yp/yp10.jpg http://www.dzoptics.com/uploads/yp/yp15.jpg http://www.dzoptics.com/uploads/yp/yp20.jpg Sony Alpha 7R http://www.dzoptics.com/uploads/yp/yp24.jpg http://www.dzoptics.com/uploads/yp/yp25.jpg http://www.dzoptics.com/uploads/yp/yp28.jpg http://www.dzoptics.com/uploads/yp/yp29.jpg

06-14-2016, 05:26 AM	#22
Na Horuk Veteran Member Join Date: Feb 2012 Location: Slovenia, probably Photos: Gallery \| Albums Posts: 11,186	Originally posted by leekil I did a couple tests with f1.2, and it seemed to indicate the same thing. Will you really get the light-gathering advantage of f1.2 from this lens, not on a film camera? But that is an industry problem, not a manufacturer problem. Its just something you have to accept if you want f1.4 or faster. In general, the f-numbers have become a convention rather than accurate representations. T-numbers might be more accurate, but they are not as useful for photographers.

06-14-2016, 11:21 AM	#23
CarlG Veteran Member Join Date: Jul 2009 Posts: 417	Any information on availibility and price for us ordinary mortals?

06-16-2016, 03:46 AM - 1 Like	#25
hinman Veteran Member Join Date: Oct 2006 Location: Fremont, CA Photos: Albums Posts: 3,473	Originally posted by Mistral75 Some 1.5 Mpix pictures from the official website. Nikon D800 Sony Alpha 7R Try to show images

06-16-2016, 01:08 PM	#27
aurele Veteran Member Join Date: Jan 2011 Location: Paris, France Photos: Albums Posts: 3,217	the rendering is quite good.

06-20-2016, 08:29 PM	#28
Clarkey Site Supporter Join Date: Jan 2008 Location: Brampton, ON, Canada Photos: Gallery Posts: 2,456	No pics from me - I think I was using the K-1 or Panoguy's body to shoot. For the record, I thought the lens balanced quite nicely on the end of the K-1, and was quite tactile to use. It was nice to have full 35mm semi-wide value back, the colour rendering seems more Sigma, than Pentax. That said, it seemed quite contrasty across the light from F4 onward. I am surprised that we got anything in focus, given how hard it was blowing that day!

06-20-2016, 09:14 PM	#29
Digitalis Site Supporter Join Date: Mar 2009 Location: Melbourne, Victoria Photos: Gallery Posts: 11,695	I see a contender for another test against my FA31mm f/1.8 - CA doesn't seem to be too bad, however the lower contrast @f/1.2 masks a lot of it. From the front focused f/8 "infinity" shot, resolution looks lower than that of the FA31.

06-23-2016, 05:45 PM	#30
Clinton Site Supporter Join Date: Feb 2010 Location: Salt Lake City, UT Photos: Gallery \| Albums Posts: 1,915	Well expletive, where do I buy this thing?

Dongzheng Optics Kerlee 35 mm f/1.2

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