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Auto Sears 2/50mm Pentax K
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PostPosted: Wed Jul 24, 2013 10:36 am    Post subject: Auto Sears 2/50mm Pentax K Reply with quote
Does anyone know anything about this lens? Is it any good?
Thank you.



PostPosted: Wed Jul 24, 2013 3:08 pm    Post subject: Reply with quote
Should be a clone of Pentax bayonet RICOH Rikenon. Seems like late plastic version. Seems to be good performer: http://forum.mflenses.com/viewtopic.php?t=47230
http://www.pentaxforums.com/forums/pentax-slr-lens-discussion/51999-new-arrivals-xr-rikenon-50-2-second-three.html


PostPosted: Wed Jul 24, 2013 5:22 pm    Post subject: Reply with quote
I had one for a couple of years.
Very sharp, excellent value for its usual low price.
They sell for very little on US ebay and are a great bargain.

I couldn't detect any difference vs the Pentax-M 50/2

I donated it some years ago, along with a lot of other Ricoh gear, to a local high school photography lab.


PostPosted: Wed Jul 24, 2013 6:35 pm    Post subject: Re: Auto Sears 2/50mm Pentax K Reply with quote
uddhava wrote:
Does anyone know anything about this lens? Is it any good?
Thank you.


It's a very nice lens. I think I paid under $40 for it. I have some sample images taken with it in my review here: http://laurphoto.blogspot.com/2013/03/sears-502-and-5017.html - click the link at the end.


PostPosted: Wed Jul 24, 2013 7:24 pm    Post subject: Reply with quote
Thanks for the information everyone. Sounds like a nice lens. Would it be any improvement or variety over a Helios 44-2, Zenitar 1.8/50 or Pentacon 1.8/50 for example?


PostPosted: Wed Jul 24, 2013 8:19 pm    Post subject: Reply with quote
No.


PostPosted: Wed Jul 24, 2013 8:34 pm    Post subject: Reply with quote
Attila wrote:
No.


So I don't have an excuse to buy another lens? Sad

Anyway, I want to buy lenses that will add to the quality of my collection. For example buying a Jupiter 21M as an improvement over a Pentacon 4/200. I just get attracted to buy inexpensive lenses that might be special.

What do you think?


PostPosted: Wed Jul 24, 2013 9:22 pm    Post subject: Reply with quote
uddhava wrote:
Attila wrote:
No.


So I don't have an excuse to buy another lens? Sad


Not for buying this one. But I can provide excuses for these other 50mm lenses: Volna 9 50/2.8 (1:2 macro, great bokeh, and star aperture shape), Industar 50-2 50/3.5 (compact and sharp Tessar clone), Voigtlander Nokton 58/1.4 (great build, fast and sharp). Hope this helps Wink


PostPosted: Wed Jul 24, 2013 9:27 pm    Post subject: Reply with quote
uddhava wrote:
Attila wrote:
No.


So I don't have an excuse to buy another lens? Sad

Anyway, I want to buy lenses that will add to the quality of my collection. For example buying a Jupiter 21M as an improvement over a Pentacon 4/200. I just get attracted to buy inexpensive lenses that might be special.

What do you think?


No harm to take it and share your experience Smile Nike ... Just do it Laughing


PostPosted: Wed Jul 24, 2013 9:42 pm    Post subject: Reply with quote
Laurentiu Cristofor wrote:
uddhava wrote:
Attila wrote:
No.


So I don't have an excuse to buy another lens? Sad


Not for buying this one. But I can provide excuses for these other 50mm lenses: Volna 9 50/2.8 (1:2 macro, great bokeh, and star aperture shape), Industar 50-2 50/3.5 (compact and sharp Tessar clone), Voigtlander Nokton 58/1.4 (great build, fast and sharp). Hope this helps Wink


Thanks I will keep my eyes open, although I already have the Industar 50-2. Smile


PostPosted: Wed Jul 24, 2013 9:48 pm    Post subject: Reply with quote
Attila wrote:
uddhava wrote:
Attila wrote:
No.


So I don't have an excuse to buy another lens? Sad

Anyway, I want to buy lenses that will add to the quality of my collection. For example buying a Jupiter 21M as an improvement over a Pentacon 4/200. I just get attracted to buy inexpensive lenses that might be special.

What do you think?


No harm to take it and share your experience Smile Nike ... Just do it Laughing


We shall see. It's tempting. I have to learn to how to sell my extra lenses. I would like to buy a lens that would be a definite improvement. Something sharper or with better color. How about Nikon lenses? I see those for not so high prices sometimes.


PostPosted: Wed Jul 24, 2013 11:50 pm    Post subject: Reply with quote
In inexpensive leaguage you will can't find better lens what you have already. If you wish to have better one buy a Carl Zeiss Contax T* lens.


PostPosted: Thu Jul 25, 2013 3:58 am    Post subject: Reply with quote
uddhava wrote:
I would like to buy a lens that would be a definite improvement. Something sharper or with better color.


Volna 9 provides very nice color and is truly a unique lens. The Nokton has both nice color and is very sharp.

Volna 9:


http://www.flickr.com/photos/laurentiucristofor/5972336337


http://www.flickr.com/photos/laurentiucristofor/8037442189

Nokton:


http://www.flickr.com/photos/laurentiucristofor/6182952098


http://www.flickr.com/photos/laurentiucristofor/9108789283


PostPosted: Sat Aug 17, 2013 8:40 am    Post subject: Reply with quote
Here are some images from Sears 50mm f2
The first is a cropped image and the second a 100% crop from the original image.




This is a very good lens and excellent value for money on the used market.
OH


PostPosted: Sun Sep 08, 2013 3:44 am    Post subject: Reply with quote
Sears 50mm f2 on Pentax K10-D






100% crop of above



100% crop of above


PostPosted: Wed Sep 11, 2013 11:11 pm    Post subject: Reply with quote
There have been some expressions of doubt over the quality of this lens.
I am led to believe that the Sears 50mm f2 is simply a re-badged XR Rikenon.
Whatever it is - it is an amazing lens.
I have posted above a full frame shot from a Pentax K-10D as well as a 100% crop.
Here is a 200% crop of the same image, and I am starting to see pixels - does this mean that the lens has out-resolved the sensor?



PostPosted: Thu Sep 12, 2013 1:26 am    Post subject: Reply with quote
"does this mean that the lens has out-resolved the sensor?"

Yes. Its not that hard to do with a lower res sensor like on the K10D.

Particularly when the lens is stopped down.
Though I consider that little Ricoh/Sears pretty darn good.

Some camera sensors are a real test. The 16mp 4/3 sensors seems to be excellent for comparing lens quality.

- my crude measure of a cameras ability to satisfy pixel-peeping curiosity, just fooling around on Excel - this is pixels per square millimeter.

Panasonic DMC-GH3 71,556
Sony Nex 7----------- 66,575
Pentax K5II----------- 44,173
Pentax Kx------------- 33,604
Pentax K10D--------- 27,100
Canon5DIII ----------- 25,810
Pentax K100D-------- 16,260
Canon5D-------------- 14,699


PostPosted: Thu Sep 12, 2013 2:05 am    Post subject: Reply with quote
luisalegria wrote:
"does this mean that the lens has out-resolved the sensor?"

Yes. Its not that hard to do with a lower res sensor like on the K10D.

Particularly when the lens is stopped down.
Though I consider that little Ricoh/Sears pretty darn good.

Some camera sensors are a real test. The 16mp 4/3 sensors seems to be excellent for comparing lens quality.

- my crude measure of a cameras ability to satisfy pixel-peeping curiosity, just fooling around on Excel - this is pixels per square millimeter.

Panasonic DMC-GH3 71,556
Sony Nex 7----------- 66,575
Pentax K5II----------- 44,173
Pentax Kx------------- 33,604
Pentax K10D--------- 27,100
Canon5DIII ----------- 25,810
Pentax K100D-------- 16,260
Canon5D-------------- 14,699


Thanks for that feedback luisalegria.
I am amazed by this little lens.
I can't believe that the XR Rikenons and these lenses sell for so little
Definitely a gem in my book.
OH
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