I have several versions of the Vivitar 70-150mm f/3.8 made by Kiron and I like the two touch zoom the best out the three that I have owned in the past. I sold all but kept the last one in M42 mount in 2 touch zoom design as I like Av mode with M42 lens without the extra step in stop-down metering.

• Vivitar 70-150mm f/3.8 in K mount -- one touch zoom
• Vivitar 70-150mm f/3.8 in K mount -- two touch zoom
• Viviar 70-150mm f/3.8 in M42 mount -- two touch zoom is my current one

It is relatively smaller and should not be considered as a big lens when compared to the DA* zoom or the Vivitar series 1 zoom. It covers a useful range for portrait and candid shots that require a longer reach. Combined with the 2x Kiron multiplier, you have a range of 70-150 in f/3.8 and 140 to 300mm with lost of 2 stops close to f/6.3 to f/7.1. I have not used the multiplier on this lens as I find the focal length 70-150mm really fit my needs as in DA* zoom. It is smaller and lighter than DA* making it an easy candidate to bring along.

I tried it out over the weekend with some candid shots in f/3.8 indoor, results are quite reasonable and when stopped down to f/5.6 and more, the lens is really sharp and the 1:4 close up in the 70mm is quite useful for flowers











Impressions & Notes

• Lens is relatively small with a good focal range from 70-150mm.
• With multiplier, it can go to 140 to 300mm
  
• Constant aperture in f/3.8 is quite useful
• Wide open aperture is a touch soft but which lens is NOT at wide aperture. With the candid test shots on my boys, I am very impressed already, more use will tell.
  
• Very sharp overall for this lens
• A great street performer that is not intimidating and heavy to bring as an alternative to bigger lens as in DA* 50-135mm.
• Close up focus happens in 70mm end and it is roughly 1:4
• Filter size is 52mm
• The built in hood is not nice but I find it too small to be reall useful
  
• Color tend to have a blue cold tone
• I like the two touch zoom design, as any focusing will less likely move the zoom position
• Very nice and decent lens to get on a budget
  
• Best strength in this lens is all the sharpness and smooth and quick focusing ring that is good with fast action shot. I would love to get back focus trap, I will experiment on slipping a piece of aluminum foil in between the K-mount and the lens rear to enable focus trap
• A value and inexpensive lens not to be missed

Related:

• Kiron 2x matched multiplier
• Vivitar 70-150mm f/3.8 in m42 mount initial test shots -- 2-touch zoom
  
• Vivitar 70-150mm f/3.8 in K-mount -- 1-touch zoom
  
• Pentax DA* 50-135mm f/2.8
• Genuine Pentax M42 adapter
• Hin's Camear Gear
  

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