Sigma 17-70 or Pentax 16-45?

Started Oct 10, 2006 | Discussions thread
Hythloday Senior Member • Posts: 2,032
I had to make the same choice

and I chose the Sigma 17-70mm.

Why?

The Pentax 16-45mm f/4.0 has a range which is a bit limited. The 16mm is very nice but the 45mm is too short to use it as a walkaround. When you also buy the Pentax 50-200mm you have to change lenses quite often which may be the cause for a dirty sensor.

The Sigma 17-70mm f2.8-4.5 DC Macro is in the range 17-45mm a f/2.8-4.0 lens. You you get two bonuses:

1. faster at the wide angle range
2. the range 45-70mm

When you also buy the Pentax 50-200mm you don't have to change your lenses so often. The sensor will be cleaner.

The Pentax K100D and the Sigma 17-70mm are a good combination. But Photoshop Elements 5.0 indicates that the Sigma 18-50mm f3.5-5.6 lens is used instead of the Sigma 17-70mm lens. PTLens cannot detect the lens, so I had to disable the "Select Lens" option. Everything works fine now.

It is a matter of taste. It also depends on what kind of photographer you are. If you mainly use the wide angle range the Pentax 16-45mm is a good choice. With my Canon 300D I had a Sigma 18-50mm f2.8 EX DC lens. The range was too short for me: too little wide angle and too little tele.

njdevil1 wrote:

Hey Gang,

Trying to decide between the two. Anyone one have any thoughts
which would perform better optically? My other lens, for now, is
going to be the Pentax 50-200. Both will be used with the 10D.
Thanks!

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