Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
11-30-2014, 03:50 PM   #16
Senior Member
Pixel-8's Avatar

Join Date: Jan 2014
Posts: 265
Sears 55/1.4 lens (same as Rikenon 55/1.4 actually; don't think either are Tomioka made) shows slightly distracting bokeh in complex backgrounds. So, IMO not the best for out of focus areas or highlights. On the other hand, this lens has moderate overall contrast and extremely good micro-contrast. All of these traits are visible in the maple leaf shot immediately above.

The other lens I own that has these qualities is the slightly rare Yashinon ds-m 35mm 2.8. Have to be really careful with grass blades or linear features in the out of focus areas. But the level of fine details in close up to near distances is amazing. Nether lens is particularly great at infinity.

12-02-2014, 12:44 PM   #17
Otis Memorial Pentaxian
Loyal Site Supporter
stevebrot's Avatar

Join Date: Mar 2007
Location: Vancouver (USA)
Photos: Gallery | Albums
Posts: 41,553
QuoteOriginally posted by boriscleto Quote
The Ricoh 55mm was made by Tomioka.

Auto Rikenon 55mm f1.4 (Tomioka)

In the US they were sold under the Sears brand.
Yes, the Sears 55/1.4 is a rebadged Rikenon 55/1.4. Both the Rikenon and the Sears versions were sold in the U.S. and Canada attached to Ricoh (Singlex TLS, TLS 401) and Sears (TLS) cameras respectively.


Steve

---------- Post added 12-02-14 at 11:47 AM ----------

QuoteOriginally posted by Piotrek K Quote
Wow when it is really Tomioka, then I rate bokeh twice as good!
Reputedly, both the Auto Rikenon 55/1.4 and Auto Rikenon 50/1.7 were made by Tomioka for Ricoh. I own both lenses as well as a mint Singlex TLS to mount them to. Tomioka was an OEM maker of lenses for several Japanese SLR companies in the '60s and early '70s. The bokeh on both my Rikenons is distinctive with no huge faults. Performance of the 55/1.4 is a notch below market contemporaries Asahi Super Takumar 50/1.4 (no longer owned) and my Minolta MC Rokker 58/1.4 (The MC denotes mount series, not coatings). My only real caveats are that the lens is prone to a center "hot spot" with digital sensors due to the large, protruding, flat rear element and that the rear element lacks a protective cowl.


Steve

Last edited by stevebrot; 12-02-2014 at 01:20 PM.
12-02-2014, 01:44 PM   #18
Senior Member
Pixel-8's Avatar

Join Date: Jan 2014
Posts: 265
Steve - Hate to say this but in the examples shown I can't agree that the 55/1.4 Rikenon/Sears lenses have either great bokeh (look at the double line effects) or are that good at infinity (look at the night shots of buildings). Where these lenses shine is with extreme micro-contrast in near- to mid-distances. Bokeh deteriorates quickly when there is any linear feature in the background. Also the lenses produce more "grainy" images (that's the extreme micro-contrast kicking in I think) than the true Tomioka designs, and they appear to me to be highly "overcorrected" which is what may make them somewhat poorer at distance. I like the nostalgic look of images taken with them, but they are not as all around perfect a design as any of the Takumars, which to my eye outperform them at nearly all distances, and have smoother bokeh.

Also, while I have heard the rumor about Tomioka producing these lenses, I wonder if that's all it is. I think it is still possible, but it has, to my knowledge never actually been documented.
12-02-2014, 09:01 PM   #19
Senior Member
Pixel-8's Avatar

Join Date: Jan 2014
Posts: 265
O.K. I guess it's time to post some photos in an attempt to back up what I am saying : )

So here goes Sears branded Rikenon 55/1.4 on Pentax K-7 -- so-so bokeh, good micro-contrast and middle ground detail. These images are pretty typical of my copy of this lens. Enjoy and comments welcome. (not meant to be particularly interesting photos, but indicative of what this lens produces).

In the first photo - find the bug!

In the second - notice the fine micro-contrast detail in the sign, also the background bokeh is o.k. because very distant. I never shoot this lens with complex backgrounds that are close-in to the plane of focus.

In the third - this is about the best "bokeh" I get from this lens, at around f3.0

In all cases, if I were to shoot the same image with my SMC Takumar 50/1.4 lens, I feel the results would have been a bit better, with one exception. I think that at short to middle distances, the Sears/Rikenon resolves more micro-detail in the portions of the image that are intentionally in focus. I attribute this to the fact that the lens is optimized for portrait distances (these lenses were computed by hand, and may vary).

12-02-2014, 09:09 PM   #20
Senior Member
Pixel-8's Avatar

Join Date: Jan 2014
Posts: 265
Attachments for Sears Rikenon 55/1.4 lens
Attached Images
View Picture EXIF
PENTAX K-7  Photo 
View Picture EXIF
PENTAX K-7  Photo 
View Picture EXIF
PENTAX K-7  Photo 
12-03-2014, 01:34 PM   #21
Senior Member
Pixel-8's Avatar

Join Date: Jan 2014
Posts: 265
The apertures used for the above shots were:

~f8 - leaves with bug
~f4 - stop sign, note the slightly hexagonal highlights off in distance
~f3 - tree leaves - can just see the straight aperture blades at right of image - actually the blades are slightly curved
12-03-2014, 01:38 PM   #22
Veteran Member
aleonx3's Avatar

Join Date: Jul 2007
Location: Brampton, Ontario
Photos: Gallery | Albums
Posts: 3,996
No question that these Rikenon 55/1.4 m42 lenses are capable to delivering great quality image... try using them with aperture wide-open at f1.4.

12-03-2014, 10:49 PM   #23
Otis Memorial Pentaxian
Loyal Site Supporter
stevebrot's Avatar

Join Date: Mar 2007
Location: Vancouver (USA)
Photos: Gallery | Albums
Posts: 41,553
QuoteOriginally posted by Pixel-8 Quote
than the true Tomioka designs
You phrase that as if Tomioka was some sort of boutique lens maker. They were not. They made some very good product, but their output was fairly generic and their designs, as with most Japanese product of the time, were essentially derivative. After all, most of the lenses they made went to market under another brand's label. What distinguishes them is consistent build quality and optical competence.

When I said the bokeh is "distinctive with no huge faults", I meant just that. Good with character...not excellent, not creamy, not dreamy, not fruity, not assertive, and with no hint of oak or smoke.


Steve

---------- Post added 12-03-14 at 09:55 PM ----------

QuoteOriginally posted by Pixel-8 Quote
Also, while I have heard the rumor about Tomioka producing these lenses, I wonder if that's all it is. I think it is still possible, but it has, to my knowledge never actually been documented.
I believe the documentation is as strong as the assertion that the Yashica contracted with Tomioka for their SLR lenses. My understanding is that they were one of a handful of companies in Japan at the time capable of providing high quality lenses in quantity and were in the business of doing so as an OEM supplier. It is assumed that Yashica and Ricoh contracted with them because it was the obvious thing to do and because the physical characteristics (build and assembly details) of the lenses in both lines is consistent with Tomioka product.


Steve

---------- Post added 12-03-14 at 10:14 PM ----------

I don't have any particularly impressive photos taken with my copy. I have used it mostly for camera porn and that sort of thing.






Yes, I have a Rikenon infestation.





The last one illustrates the rather poor flare resistance I have noted with this lens. I will try and find a few showing the center hot spot caused by reflection off the rear element.


Steve

Last edited by stevebrot; 12-03-2014 at 11:16 PM.
12-04-2014, 10:20 AM   #24
Senior Member
Pixel-8's Avatar

Join Date: Jan 2014
Posts: 265
Steve, I hear you, and think we agree that the Rikenon 55/1.4 is a good lens all around. Love the wine analogy. What I really meant is that the Rikenon 55/1.4 is not in the same class as for ex, the Tomioka made 55/1.2 which is a famous lens. Also, you are right that Tomioka made other less well regarded lenses for others as well as other really excellent lenses (for ex the 60mm macro). The build and design of the 55/1.4 does seem like some other lenses made by Tomioka. But I've always thought it was Mamiya Sekor that made the 55/1.4's. I could be wrong.

I haven't had the center hotspot problem yet with mine, but see how it could easily happen with that flat rear element. Folks who have never held this lens in hand may not appreciate what a hand grenade it is (very big hunk of glass).

Heck it's 55mm and f1.4 so even chunkier than the takumar 50/1.4s.

Sometimes I walk around with this lens, the large Super Takumar 35/2 and the Super Takumar 85/1.9. These lenses all have a distinctive old school cachet (not exactly smoky) but weigh a ton (not very fruity), so a well padded shoulder strap is essential.
12-11-2014, 03:05 PM   #25
Senior Member
Pixel-8's Avatar

Join Date: Jan 2014
Posts: 265
What I've learned by googling and looking at photos of the 55/1.4 lenses is that there are at least 4 versions of the Rikenon or Sears branded 55/1.4 lenses. That doesn't even count the Mamiya, Porst, Cosinon, Revuenon etc...versions.

The oldest Auto Rikenon and Sears 55/1.4 lenses have a silver ring (narrow band) around the rear portion of the lens barrel -i.e., where the aperture stop down lever is located. Also, the earliest ones have diaprhagm blade tips that face forward towards the front element of the lens. And the blades are slightly curved. The OOF highlights remain somewhat circular until around f3.5. Mine is Sears branded and is this version (version 1). These lenses lack contrast wide open up to about f4.0 but are sharp in the center from f2.0 and very evenly sharp from corner to corner at f4.0 and above with good microcontrast. They are not the best wide open from f1.4 to f2.0.

The next oldest ones that are branded Ricoh or Sears have a black banded ring not a silver one, and the diaphragm blade tips face the rear of the lens, not the front. Also, the blades are straight edged not circular. In the leaf photo in the above thread the blades are clearly straight so I'm guessing it is a Rikenon version 2. These lenses may sharpen up a bit more before f4.0, but the highlights will be hexagonal earlier on (shown in the leaf shot posted here).

These details of lens construction and other hints suggest that the earliest ones may have a stronger connection to Tomioka than the later ones, even though the lens optical design appears similar. It fits with the speculation or theory that the design was originally Tomioka but then was borrowed by other makers. In some cases the coatings were improved, so that the later versions may appear to be sharper or more contrasty.

Note: further evidence is that some early to mid series Yashinon lenses that are attributed directly to Tomioka* share many of the details mentioned above (including outward facing aperture blades that are slightly rounded). That doesn't make them necessarily better than other, later, Kyocera/Yashica made versions, but suggests a similar origin and close tie to Tomioka.

* Tomioka was bought out by Yashica and their designs were incorporated into and/or influenced many of the later Yashica lenses. There is a lot more information on the supposed origin of these lenses online. None of it is particularly conclusive.
03-13-2016, 10:08 AM   #26
Pentaxian
Jean Poitiers's Avatar

Join Date: Apr 2011
Location: Lost in translation ...
Photos: Gallery | Albums
Posts: 18,030
Some recent images of an Auto Rikenon 55/1.4 ...







03-13-2016, 02:48 PM   #27
Senior Member
Pixel-8's Avatar

Join Date: Jan 2014
Posts: 265
Jean, those are very nice images with the Rikenon, especially the first two. There's a bit of purple fringing and slightly nervous bokeh in the third image. My copy of this lens also suffers from those two problems wide open until around f3.5.
03-13-2016, 06:11 PM   #28
Otis Memorial Pentaxian
Loyal Site Supporter
stevebrot's Avatar

Join Date: Mar 2007
Location: Vancouver (USA)
Photos: Gallery | Albums
Posts: 41,553
QuoteOriginally posted by Pixel-8 Quote
There's a bit of purple fringing...
I clicked through and viewed the full-size original for the third image and while there was mild LaCA, I don't see the fringing. The only reason I say anything is that my copy has does not have any particular tendency toward PF. As for the nervous bokeh...yep, mine does that too at f/4, though much depends on background. Pretty much any lens will go nervous with playground bark or gravel in the background.


Steve

Last edited by stevebrot; 03-13-2016 at 06:38 PM.
03-14-2016, 05:22 AM   #29
Pentaxian
Jean Poitiers's Avatar

Join Date: Apr 2011
Location: Lost in translation ...
Photos: Gallery | Albums
Posts: 18,030
QuoteOriginally posted by Pixel-8 Quote
Jean, those are very nice images with the Rikenon, especially the first two. There's a bit of purple fringing and slightly nervous bokeh in the third image. My copy of this lens also suffers from those two problems wide open until around f3.5.
Thanks.

Here are two more images fro today's "Daily Challenge" thread ... first version in B&W is wide open and the color is at f/2 ... Cheers, J




03-14-2016, 05:26 AM   #30
Pentaxian
Jean Poitiers's Avatar

Join Date: Apr 2011
Location: Lost in translation ...
Photos: Gallery | Albums
Posts: 18,030
QuoteOriginally posted by stevebrot Quote
I clicked through and viewed the full-size original for the third image and while there was mild LaCA, I don't see the fringing. The only reason I say anything is that my copy has does not have any particular tendency toward PF. As for the nervous bokeh...yep, mine does that too at f/4, though much depends on background. Pretty much any lens will go nervous with playground bark or gravel in the background.


Steve

Thanks for your comment, Steve. I tried this shot to see what the background would be like ... I have to go "fast" sometimes(really, all the time) and that sometimes gives in interesting results for me ... fun to see after the "rush" what was accomplished. Salut, J
Reply

Bookmarks
  • Submit Thread to Facebook Facebook
  • Submit Thread to Twitter Twitter
  • Submit Thread to Digg Digg
Tags - Make this thread easier to find by adding keywords to it!
55mm, camera, designs, images, lenses, pentax lens, pictures, pm, product, quality, ricoh, ricoh rikenon, rikenon, sample photo, sears, steve, time, tls, tomioka, yashica
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
For Sale - Sold: Ricoh XR Rikenon 50 1.4 (non-Ricoh Pin) with Leather case. isb.deep Sold Items 4 05-19-2013 08:54 AM
For Sale - Sold: XR RIKENON ZOOM 1:4 70-150mm RICOH slawek Sold Items 11 04-04-2012 10:10 PM



All times are GMT -7. The time now is 12:57 AM. | See also: NikonForums.com, CanonForums.com part of our network of photo forums!
  • Red (Default)
  • Green
  • Gray
  • Dark
  • Dark Yellow
  • Dark Blue
  • Old Red
  • Old Green
  • Old Gray
  • Dial-Up Style
Hello! It's great to see you back on the forum! Have you considered joining the community?
register
Creating a FREE ACCOUNT takes under a minute, removes ads, and lets you post! [Dismiss]
Top