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11-04-2013, 07:40 PM   #16
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QuoteOriginally posted by Merts Quote
almost expecting to have to do it with the 55-300 when I get it.
I did not with mine. The need is less with slower lenses as you will have more depth of focus to 'mask' any small error. It is also a lot harder with a zoom because the focus might be different at different focal lengths. That said, try yours with some accurate tests and if its good, don't mess with it.

One quick way to test is to set up on a tripod, using liveview focus and take a picture. Then turn off live view and use the PDAF see if the lens changes focus. If it does then there is a difference between CDAF and PDAF. Liveview (CDAF) should be accurate as you are using the sensor rather than the AF module. Do repeated tests before making a conclusion.

11-04-2013, 07:49 PM   #17
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QuoteOriginally posted by jatrax Quote
One quick way to test is to set up on a tripod, using liveview focus and take a picture. Then turn off live view and use the PDAF see if the lens changes focus. If it does then there is a difference between CDAF and PDAF. Liveview (CDAF) should be accurate as you are using the sensor rather than the AF module. Do repeated tests before making a conclusion.
Thanks again.

This forum really is a terrific source of information.


PS. OldNoob.
Apologies for hijacking your thread.....
11-05-2013, 04:40 PM   #18
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Personally - 'if' I could afford to - I'd have 3 lenses (note - I'm not a professional!)
My current lenses are: kit 'red' 18-55mm, Sigma 18-200mm DC f/3.5-6.3 (used 95% of the time) and a freebie Rokinon 85mm f/1.4 (nice lens, but limited in use).

My desired stack would be:

1. Pentax 18-135mm WR (because I use my camera outdoor a lot)
2. Pentax 55-300mm WR (similar to above reason - with more range)
3. Sigma 17-70mm f/2.8-4 C - because I'd like a faster lens for those times I need it - indoors/night)

The 18-250mm would be a great walk around lens - to cover most scenarios - just as my 18-200mm is.

I do find that I make use of the 200mm - however, it is a slow lens and lighting is key. The 55-300mm gives a little nudge - as its long end is 5.6 vs. 6.3

If you're looking for a single lens solution... I'd recommend either the 18-250mm Sigma or 18-135mm Pentax ( for the WR - specifically).
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