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Auto Rikenon 55mm f/2.8
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PostPosted: Mon Oct 03, 2016 8:28 am    Post subject: Auto Rikenon 55mm f/2.8 Reply with quote
A normal lens with unimpressive performance, it might be misaligned. But stopping down solves most of it.
The most interesting thing about it is how the aperture ring works.







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PostPosted: Mon Oct 03, 2016 8:32 am    Post subject: Reply with quote
Very nice photos. I think it is a triplet by Cosina.


PostPosted: Mon Oct 03, 2016 9:28 am    Post subject: Reply with quote
You should see the f1.8 version :)


PostPosted: Mon Oct 03, 2016 1:59 pm    Post subject: Reply with quote
Yes, very nice stopped down.


PostPosted: Mon Oct 03, 2016 3:13 pm    Post subject: Reply with quote
Yes, I have one in Sears brand.
Unusual among SLR lenses of the era, a front cell focusing triplet.
I have gotten better results wide open though.

This was the cheapest kit lens supplied with the Ricoh TLS.


PostPosted: Mon Oct 03, 2016 8:45 pm    Post subject: Reply with quote
Pancolart wrote:
Very nice photos. I think it is a triplet by Cosina.



uddhava wrote:
Yes, very nice stopped down.


Thanks!

buerokratiehasser wrote:
You should see the f1.8 version Smile

I'm guessing it's better Wink

luisalegria wrote:
Yes, I have one in Sears brand.
Unusual among SLR lenses of the era, a front cell focusing triplet.
I have gotten better results wide open though.

This was the cheapest kit lens supplied with the Ricoh TLS.


Build quality is nice though. And the focusing ring is super smooth and well dampened. Makes me wonder what kind of grease they put in there Smile


PostPosted: Mon Oct 03, 2016 8:51 pm    Post subject: Reply with quote
Two bonus shots at f/5.6 or 8.





PostPosted: Sat Jun 22, 2019 1:46 am    Post subject: Re: Auto Rikenon 55mm f/2.8 Reply with quote
I have been longing for such a lens for a long time. It is Cosina made. Yes, interesting aperture ring. What I found is: probably it can have the bubble bokeh effect, similar to that of a Meyer Trioplan 100mm f/2.8, more similar to Fuji 55mm f/2.2.


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PostPosted: Sat Jun 22, 2019 10:29 am    Post subject: Reply with quote
Nice shots, i had forgot about this lens.


PostPosted: Fri Jul 05, 2019 5:05 pm    Post subject: Reply with quote
Picked up a new one branded Universar.

What I found unusual is that the bokeh shape is not like other triplets, and the focus plane is relatively flat. Sharp details can be found in the corners at 2.8 unlike on the Trioplan and Domiplan. It also has a halo effect or glow.

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PostPosted: Sat Jul 06, 2019 11:04 am    Post subject: Reply with quote
There is also a Vivitar version of the lens: https://www.pentaxforums.com/userreviews/vivitar-55mm-f28-auto.html I've also seen Porst and Revuenon. All of them probably made by Cosina.


PostPosted: Fri Jul 12, 2019 3:11 pm    Post subject: Reply with quote
blotafton wrote:
Nice shots, i had forgot about this lens.


Thanks. It is under other brand as well. From Flickr, a guy (who might also be a member here) said he put the lens focus to infinity and used a helicoid to focus, that gives the dramatic effect of bubble bokeh.


PostPosted: Thu Jun 18, 2020 10:17 pm    Post subject: Reply with quote
Mine displays pretty low contrast, This is wide open. I've boosted it a bit.

Ricatnon by The lens profile, on Flickr
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