Saturday, May 2, 2020

Auto SEARS 50mm f2


This 50mm distributed by Sears, but is the same lens as the Ricoh P Rikenon 50mm F2.  The Aperture of this lens ranges from F2.0 to F16. It has a 6-blade diaphragm and a 5mm filter since.  My particular lens is in excellent condition, has a Pentax mount (easily adaptable to the NX1 with suitable lens adapter) and is stamped with S/N: 309399.

I will post some links to other online reviews and photos, but in general this is a sharp vintage lens at greater than f5.6 with good color saturation. Minimum focus distance is about 2ft.

The mount is metal with a plastic barrel; however the lens feels solid and focus adjustments are smooth.  This lens can be found online for around $15-$25 depending on condition.  For that price the lens if totally worth it.




All photos below were taken hand-held on a bright-sunny day.  No 'post' effects except that the 28MP photos were re-sized to 1920x1080.

Yellow flower is a Mariposa Lilly photographed in southern Arizona near the Mexican border.


 PIC52_f11_ISO200_1/500sec_EV-0.6

 PIC54_f8_ISO100_1/320sec_EV-0.3

PIC55_f8_ISO100_1/320sec_EV-0.3

PIC62_f5.6_ISO200_1/16000sec_EV-0.3

(Hedgehog Cactus Flower) f5.6_ISO200_1/1600sec_EV-0.3

 PIC58_f2.8_ISO100_1/320sec_EV-0.3

PIC62_f5.6_ISO200_1/16000sec_EV-0.3


Read more at on the AUTO SEARS 50mm f2 here:

https://www.pentaxforums.com/userreviews/sears-auto-50mm-f20.html

https://blog.bkspicture.com/review_Auto_Sears_50mm_f2.html

https://www.pentaxforums.com/userreviews/sears-auto-50mm-f20.html#ixzz6LKf2dbhA


Thursday, January 16, 2020

PROSPEC 28-200mm ZOOM f3.8-5.6 Test Photographs

This len a PROSPEC 28-200mm MC AUTO ZOOM  f3.8-5.6. It has a Nikon mount adapted to the Samsung NX1.  The focal range adjustment given the the NX1's APS-C sensor crop make this lens a 42-300mm equivalent.

The photos below are initial photographs for the purposes of examining the lens for its mechanical and optical properties. 

The photos in this set have not been altered and were shot handheld.


There is very little about PROSPEC lenses on the Internet, but I haven't researched too deeply yet.

125mm  f8  1/125s  -0.3EV  ISO100 



FL 90mm  f3.5  1/250s  -0.3EV  ISO100 


FL 50mm  f11  1/250s  -0.3EV  ISO200 

FL 50mm  f11  1/250s  -0.3EV  ISO200