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Kiron 28MM F2 on Sony A7
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PostPosted: Thu Mar 31, 2022 8:45 am    Post subject: Reply with quote
Wonder are these out of focus due to a none flat focus field, or are some of the exit pupils very close to the sensor?

The sony sensor thickness, hits some < 35mm lenses, but I think it is mostly colour smearing.


PostPosted: Thu Mar 31, 2022 4:26 pm    Post subject: Reply with quote
Arutemu wrote:

Wow, the Vivitar one is just embarrassing...


The Nikkor Ai/AiS 2/24mm is just as embarassing ... and so is the Vivitar 2/24mm. Or the Nikkor AiS 1.4/35mm (which is better than the original pre-AI!!). Nothing unusual for fast vintage wideangles. Heck, even the common 2.8/35mm from the 1960s were pretty lousy!

Doc Sharptail wrote:

Wonder if it needs a cleaning... I don't usually see them that bad unless a cleaning is required- at least out of the 28mm Vivitars I've had. Might be sample variation too.

-D.S.

No, this sample is perfectly clear. I have a second sample (actually the first one I bought) which is somehow fogged. "Sharpness" is the same; thus I would say it's not sample variation. Maybe there were different computations ??


Slalom wrote:
Wonder are these out of focus due to a none flat focus field, or are some of the exit pupils very close to the sensor?
The Sony sensor thickness, hits some < 35mm lenses, but I think it is mostly colour smearing.


Some years ago I ran a series of trials using both the A7RII as well the Leica M (240). The latter has a very thin sensor stack. There were obvious differences in corner performance with classic symmetrical wideangles (Leica 1.4/35 ASPH and Zeiss C Biogon 4/21mm). However no differences were seen using retrofocus wideangles or fast normal lenses; their exit pupil isn't close enough to the sensor to cause problems with the A7 series.

S


PostPosted: Fri Apr 01, 2022 2:01 am    Post subject: Reply with quote
stevemark wrote:


No, this sample is perfectly clear. I have a second sample (actually the first one I bought) which is somehow fogged. "Sharpness" is the same; thus I would say it's not sample variation. Maybe there were different computations ??



Highly likely with vivitar lenses. I recall something odd with slower wide-angles being different, but that's a heck of a long ways back.

-D.S.


PostPosted: Fri Apr 01, 2022 11:32 am    Post subject: Reply with quote
The Komine Vivitar isn't a bad lens. This was shot at F8 or so and the corners look fine to me. It is a bit narrow for F2 (49mm filters) but longer than most 28mm lenses (partly due to it;s close focusing ability, which is the real boon of the lens). At F2 it has less softness than the Kino version also made by Vivitar. I think Robin Parmar who created the Vivitar 28mm Bestiary calls it he best one. Bokeh can be very wonky though.

Sprikkenburg View by The lens profile, on Flickr


PostPosted: Fri Apr 01, 2022 1:15 pm    Post subject: Reply with quote
D1N0 wrote:
The Komine Vivitar isn't a bad lens. This was shot at F8 or so and the corners look fine to me. It is a bit narrow for F2 (49mm filters) but longer than most 28mm lenses (partly due to it;s close focusing ability, which is the real boon of the lens). At F2 it has less softness than the Kino version also made by Vivitar. I think Robin Parmar who created the Vivitar 28mm Bestiary calls it he best one. Bokeh can be very wonky though.


When reading your "49mm filters" I knew something was wrong, since my Vivitar had a larger filter thread. Turns out it was the Vivitar (Komine) 2/24mm I had tested, and NOT the Vivitar (Komine) 2/28mm!!

Sorry for this grave mistake. I have corrected my previous postings.

Interestingly. the small house shown in the 100% crops of my test seems to be as big in the image taken with the 24mm Vivitar as with 28mm Kiron & Minolta ... !! That probably did contribute to my error ...

S


PostPosted: Fri Apr 01, 2022 1:16 pm    Post subject: Reply with quote
stevemark wrote:
D1N0 wrote:
The Komine Vivitar isn't a bad lens. This was shot at F8 or so and the corners look fine to me.
It is a bit narrow for F2 (49mm filters) but longer than most 28mm lenses (partly due to it;s close focusing ability, which is the real
boon of the lens). At F2 it has less softness than the Kino version also made by Vivitar. I think Robin Parmar who created the Vivitar 28mm
Bestiary calls it he best one. Bokeh can be very wonky though.


When reading your "49mm filters" I knew something was wrong, since my Vivitar had a larger filter thread. Turns out it was the
Vivitar (Komine) 2/24mm I had tested, and NOT the Vivitar (Komine) 2/28mm!!

Sorry for this grave mistake. I have corrected my previous postings.

Interestingly, the small house shown in the 100% crops of my test seems to be as big in the image taken with the 24mm Vivitar
as with 28mm Kiron & Minolta ... !! That probably did contribute to my error ...

S


PostPosted: Fri Apr 01, 2022 2:59 pm    Post subject: Reply with quote
stevemark wrote:
D1N0 wrote:
The Komine Vivitar isn't a bad lens. This was shot at F8 or so and the corners look fine to me. It is a bit narrow for F2 (49mm filters) but longer than most 28mm lenses (partly due to it;s close focusing ability, which is the real boon of the lens). At F2 it has less softness than the Kino version also made by Vivitar. I think Robin Parmar who created the Vivitar 28mm Bestiary calls it he best one. Bokeh can be very wonky though.


When reading your "49mm filters" I knew something was wrong, since my Vivitar had a larger filter thread. Turns out it was the Vivitar (Komine) 2/24mm I had tested, and NOT the Vivitar (Komine) 2/28mm!!

Sorry for this grave mistake. I have corrected my previous postings.

Interestingly. the small house shown in the 100% crops of my test seems to be as big in the image taken with the 24mm Vivitar as with 28mm Kiron & Minolta ... !! That probably did contribute to my error ...

S


Interestingly I have a Komine 24mm 2.5 in Panagor. Could be the same as the Vivitar but misstating the aperture by .5 is rather much, even for Vivitar. It is soft wide open, but haven really done serious photography with it yet.

Panagor Auto Wide-Angle 24mm 1:2.5 (Komine) by The lens profile, on Flickr


PostPosted: Fri Apr 01, 2022 3:31 pm    Post subject: Reply with quote
D1N0 wrote:

Interestingly I have a Komine 24mm 2.5 in Panagor. Could be the same as the Vivitar ...


I don't think so. My Vivitar (Komine) 2/24mm seems to see a bit longer, and it's exit pupil is rather large (too big for a 2.5/24 I would say).

S


PostPosted: Fri Apr 01, 2022 8:04 pm    Post subject: Reply with quote
stevemark wrote:
D1N0 wrote:

Interestingly I have a Komine 24mm 2.5 in Panagor. Could be the same as the Vivitar ...


I don't think so. My Vivitar (Komine) 2/24mm seems to see a bit longer, and it's exit pupil is rather large (too big for a 2.5/24 I would say).

S


Must be a different version then. The Panagor takes 55mm filters not 52mm.


PostPosted: Sat Apr 02, 2022 9:21 pm    Post subject: Reply with quote
Arutemu wrote:
I have that lens too. Not too concerned about the corners, but flaring can be problematic, unless used creatively. Flaring at night is downright annoying. So are distortions, but that's to be expected from 28mm. Still can't bring myself to like this focal length, despite having several.


I like that creatively used flaring. It´s a great picture. Thanks for sharing!


PostPosted: Sat Apr 02, 2022 9:59 pm    Post subject: Reply with quote
stevemark wrote:


When reading your "49mm filters" I knew something was wrong, since my Vivitar had a larger filter thread. Turns out it was the Vivitar (Komine) 2/24mm I had tested, and NOT the Vivitar (Komine) 2/28mm!!


I have that Vivitar (Komine) 24mm f/2.
When you presented the images saying it´s the 28mm specimen of the Vivitar f2 wide angles, I was intrigued how similar it renders compared to the 24mm. Turns out it was the 24mm f2 all along Laughing
Btw I can confirm all said above is true for the 24mm as well. Nice bokeh, good colors, very prone to flare and performing rather bad in the corners when used wider open than f8.

That one was taken with low ISO and rather wide open aperture. Not f/2 though, probably 2.8 or 4.


Here´s a crop from the lower right corner.



PostPosted: Sun Apr 03, 2022 1:24 pm    Post subject: Reply with quote
My Panagor 24mm 2.5 is definitely different. Two corners at F2.5 and F8 100% crop on my 36mp K-1

2.5


8


PostPosted: Sun Apr 03, 2022 9:24 pm    Post subject: Reply with quote
ZuikosHexanonsandVivitars wrote:

I have that Vivitar (Komine) 24mm f/2.
When you presented the images saying it´s the 28mm specimen of the Vivitar f2 wide angles, I was intrigued how similar it renders compared to the 24mm. Turns out it was the 24mm f2 all along Laughing


The images from Swiss towns I presented earlier were taken with the Kiron 2/28mm, NOT with the Vivitar (Komina) 2/24mm. Only the 100% corner crops shown later in the thread were from the Vivitar 2/24mm (and from the Kiron 2/28mm and Minolta MD 2/28mm, of coure).

S


PostPosted: Wed Apr 13, 2022 9:45 pm    Post subject: Reply with quote
in normal daylight shooting i don't care for this lens over any other, but that f/2 at dusk is well dreamy




#1


#2


PostPosted: Thu Apr 14, 2022 10:07 am    Post subject: Reply with quote
It was a wonderful chance to visit this kind of site and I am happy to know all about it.


PostPosted: Sun Jun 05, 2022 10:04 pm    Post subject: Reply with quote
While looking for another lens in the attic, I stumbled upon three more Kiron made f2 wideangles I more or less had forgotten. Here they are, together with the two samples shwon earlier in this thread:



From left to right:

1) Kiron 28mm 1:2 (Minolta MD bayonet)
2) Kiron 28mm 1:2 (Minolta MD bayonet)
3) Vivitar (Kiron made, SN 22...) 28mm 1:2 (Canon FD bayonet)
3) Vivitar (Kiron made, SN 22...) 24mm 1:2 (Canon FD bayonet)
3) Vivitar (Kiron made, SN 22...) 24mm 1:2 (Konica AR bayonet)

Three things are interesing and remarkable:

* The Kiron 2/28mm does NOT have the same optical construction as the Kiron-made Vivitar 2/28mm (clearly different reflections on the lens surfaces!)

* the Canon FD mount Vivitar lenses 2/28mm and 2/24mm look nearly identical

* The two Vivitar 2/24mm lenses seem to have the same optical construction (judging from the reflexes), but their barrel is quite different (larger focus ring on the Konica AR version)
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