I didn't meant to scare you. I wouldn't get rid of the 28-70 f4.0 for several reasons. In it's class it's a very well balanced lens, sharp but not tack sharp wide open at f4.0, very sharp stopped down to f5.6 and only gets better as you stop down to f11 or so. Optically it's better than pretty much any other Pentax "Normal" Zoom except for maybe the F 35-70 which is surprisingly good as well. It exhibits good Bokeh, It's lightweight, so your back won't pay a big price carrying it around with you. It's better corrected for CA than a lot of more expensive lenses. But, to that point it's just not very expensive. You won't get a lot selling one, of pay a lot buying one even in EX+ condition. If I were you I'd stop worrying and just enjoy using it. Just be aware that it could go bad at any time, and I do mean that, my first copy of this lens was perfect one day, and the rear aspheric element just came apart with the lens sitting on a shelf. Bottom line, is that if the dreaded separation did happen, I'd easily pay the going price for one in decent condition to replace it.

On 9/22/2013 12:53 AM, Bipin Gupta wrote:
Hello Folks, I am now shit scared of element separation on my Pentax
AF 28-70 f4 AL. It served me well on the Pentax ZX-5 since circa 2002.
Now I need your advice. I have the FA 28-80 f3.5-5.6 as well. Should I
keep this one and sell the 28-70??
Thanks in advance.
Regards.
Bipin - from that far away enchanting land



--
A newspaper is a device for making the ignorant more ignorant, and the crazy, 
crazier.

     - H.L.Mencken


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