Carl Zeiss Jena Biotar 58mm f/2.0 (M42) On Flowers

With inputs from others, my copy Carl Zeiss Jena Biotar 58mm f/2.0 that I recently gett is similar to the Russian lens Helios 44-2. I manage to get some test shots on small flowers today. The lens is quite decent and I use a cosina 1:1 matched 49mm close up filter on the test shots as the lens don't get close to subjects -- minimum focusing distance is about 1.65 feet

f/5.6


f/2.0 + 1Ev



f/2.0 + 0.7 Ev


f/2.0 cropped 0Ev
without diopter

I am pretty happy with the bokeh and color. At f/2.8 and f/2.0, I seem to see darker picture in Av mode, hence I dial in +Ev


Impressions & Notes

• Sharpness is very decent in wide open aperture
• Filter size is 49mm
• Minimum focusing distance is at 1.65 feet
  
• My copy has a letter 1 overlapped with letter 'Q' denoting export version
• 10 blades, very circular diaphragm opening in many f/stops
  
• All chrome color, very well made
• Aperture ring in front that has a hidden preset ring when pulled down towards camera
• Continuous aperture setting with no click stop between half and full stops -- I like it
• At wide open aperture, a bit darker in the metering in Av mode
• Bokeh is outstanding, no degradation on bokeh is noticed when used with diopter
  

Related:

• Carl Zeiss Jena Biotar 58mm f/2.0 (M42) Purchase
• Carl Zeiss Jean Biotar 58mm f/2.0 (M42) On Portraits
  
• Cosina 1:1 matched macro adapter
  
• Genuine Pentax M42 t K Adapter
• Hin's Camera Gear