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 






Tuesday, December 24, 2019

Initial photographs with a SIGMA 75-250mm f4-5

I discovered this SIGMA ZOOM 75-250mm f4-5 'multi-coated' lens at a pawn shop in Phoenix for $15. Research of SIGMA's production shows this lens to be of 1981-vintage.  With the only issue being a slightly 'sticky' axial barrel movement to zoom the lens mechanically and optically were in very good condition.

The photographs below are untouched initial images to get a first impression on the performance and operation of the lens.

The mount is Konica (KR) and it was secured to the NX1 with a KR-to-NX mount adapter.

My initial impressions of these first photographs were very positive for sharpness and I wasn't even using a tripod for  the 250mm images.

SIGMA ZOOM 75-250mm f4-5 [SN 913147]







Monday, September 16, 2019

Test drive...Zoom-NIKKOR 35-105mm f3.5-4.5 MACRO


First introduced in January, 1983 the Zoom-Nikkor 35-105mm f/3.5-4.5 MACRO lens was popular due to the pull-and-slide zoom design that covered a 35-105mm range.  The Macro setting is a 1:4 size reproduction.



           Zoom-NIKKOR 35-105mm f3.5-4.5 adapter to the NX1 

I adapted this lens using a Fotasy NK to NX mount to the Samsung NX1. The following photographs were test shots to see the lens imaging characteristics. 

So far I am really impressed with this lens the color, contrast and sharpness result in very good imaging and creative potential.

Reference source: https://www.mir.com.my/rb/photography/companies/nikon/nikkoresources/zoomsMF/35105mm.htm

Note: The first three photographs were 'adjusted' in post (exposure, contrast).  No adjustments were made to the remaining photographs in this post.










 

 FL-105mm f8  ISO-100  1/320s  EV+0.3

FL-90mm f8  ISO-100  1/320s  EV+0.3

FL-80mm f8  ISO-100  1/320s  EV+0.3

Sunday, August 25, 2019

Photo title: "Theater"


NX1 camera with Samsung 16-50mm S-Lens / f5.6 / ISO 1600 / 1/25sec / EV +1step. Tripod mounted.  Unedited JPEG from camera.

Wednesday, August 7, 2019

Yashica 42-75mm ML Lens


I have in my collection this excellent condition Japanese made Yashica 42-75mm (ML) f3.5-4.5 zoom lens.

The designation 'ML' on the lens denotes multi-coated optics and signifies placement of the lens above consumer grade, yet below professional optics standards.  More on the general background of this Yashica lens below.

I wanted to share some of my initial photographs with this lens, but first some interesting history and background:

Contax/Yashica (C/Y) manual-focus lenses have a common bayonet mount were introduced in 1975 simultaneously on the Contax RTS and Yashica FX-1 camerasl; but also marked by Zeiss. 

Manufacturing of these lenses originated and evolved from Yashica's purchase of Tomioka in 1968 and changed its name to Tomioka Optical Co., Ltd. in 1969.  The Tomioka plant made German Carl Zeiss licensed optics under license for use on some Japanese cameras - like the Contax.   Yashica lenses, manufactured by Tomioka Optical, benefited from this licensing and manufacturing relationship with Carl Zeiss.  While not up to the top Zeiss standards, the "ML" designation on the lens is part of a range of Yashica lenses included in their premium line-up for the more serious photographer.

Note that consumer SLR cameras by Yashica or Contax were usually equipped with 'DSB' lenses, which had single-coated optics.  All these interchangeable lenses can be used with any Yashica or Contax camera equipped with the C/Y bayonet lens mount.




All photos as shown as-photographed.  No adjustments or cropping were performed.
42mm_f11_ISO100_1/400sec_-0.3EV

 42mm_f11_ISO200_1/320sec_EV-0

 42mm_f11_ISO200_1/640sec_-0.3EV

60mm_f8_ISO100_1/400sec_-0.3EV

75mm_f8_ISO100_1/250sec_-0.3EV

75mm_f11_ISO100_1/400sec_-0.3EV


Sources and references for this post were obtained from the following website links:

http://camera-wiki.org/wiki/Contax/Yashica_lenses#zoom
https://www.photo.net/discuss/threads/yashica-slr-lenses-vs-zeiss.366554/
https://camerapedia.fandom.com/wiki/Tomioka

http://allphotolenses.com/lenses/item/c_438.html
http://cargocollective.com/yashica/About-Yashica-ML-Prime-Lenses

Finally, A third-party video showing this Yashica 42-75 ML lens in video can be found via this link: https://www.youtube.com/watch?v=XVzPlkd_rhU

Yashica 42-75mm (ML) f3.5-4.5 lens (SN A7802724)