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:

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.






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

Finally, A third-party video showing this Yashica 42-75 ML lens in video can be found via this link:

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

Sunday, June 23, 2019

50mm Minolta MC ROKKOR-PF f1:1.7 on the NX1

This 50mm Minolta MC ROKKOR-PF f1:1.7 (SN 2181401) was manufactured in April of 1973 and was a regular standard lens with very good optics. 
I found this lens at a thrift store for $15. The lens was attached to a Minolta 35mm film camera of that era.

Info Source:

The PF in the lens name is a designation code designating the number of groups and elements within a lens, with details as follows:
First Letter (no. of groups): T=3; Q=4; P=5; H=6; S=7; O=8; N=9.
Second Letter (no. of elements): C=3; D=4; E=5; F=6; G=7; H=8; I=9; J=10; K=11; L=12.

Therefore, for this lens designation (PF) means 5-groups with 6-elements.
f8   ISO200   1/250sec   0EV

f5.6   ISO100   1/250sec   0.3EV

f5.6   ISO100   1/250sec   0.3EV

 f8   ISO100   1/200sec   0EV

f5.6   ISO100   1/200sec   0EV
 In this photo above, I optimized a RAW image in Adobe Lightroom
The coating materials on these early MC (meter coupled) lenses comprised magnesium fluoride, plus “other ingredients”, and the actual coatings were double coated in a process Minolta called “Achromatic Coating”, giving superior colour rendition and light transmission when compared to competing manufacturers.

Another term commonly seen in relation to Minolta lenses is the term “Rokkor”. Like many other manufacturers, Minolta employed a separate name for its lenses, in this case the name “Rokkor” was chosen by Minolta founder, Kazuo Tashima, as a reference to Mount Rokko in Japan, which is adjacent to the Minolta Factory 

(Above information Reference site:

Links for additional information on this Rokkor lens and Minolta lenses in general - see: