Re: DA*16-50mm/2.8 and FA28-70mm/2.8

[P.J. Alling]

On 5/26/2016 2:02 PM, Mark Roberts wrote:

Stanley Halpin wrote:


However, as I recall the 28-70 had the reputation of being a very sharp lens 
that had a fatal construction flaw; one of the lens elements would delaminate.

That was the 28-70 f/4.0 not the 2.8.

  
I can vouch for that, I had an early 28-70 f4.0 that did just that. It 
appears that it was a composite molded plastic and glass aspherical 
element that failed to hold together.  The second copy that I acquired, 
seems to be holding together, though it's construction is well 
plastic-ey.  Sadly the plastic fantastic FA zooms don't seem to wear 
that well mechanically.


--
I don't want to achieve immortality through my work; I want to achieve 
immortality through not dying.
-- Woody Allen


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Re: DA*16-50mm/2.8 and FA28-70mm/2.8

[Mark Roberts]

Stanley Halpin wrote:

> However, as I recall the 28-70 had the reputation of being a very sharp lens 
> that had a fatal construction flaw; one of the lens elements would 
> delaminate. 

That was the 28-70 f/4.0 not the 2.8.

 
-- 
Mark Roberts - Photography & Multimedia
www.robertstech.com





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Re: DA*16-50mm/2.8 and FA28-70mm/2.8

[Stanley Halpin]

I had the 16-50 and enjoyed it. I Enjoy using primes more, and have 15, 21, 35, 
and 50mm lenses that cover that range adequately. But I never had any quality 
or mechanical issues with the lens.

I have never had the 28-70 so can’t do any sort of comparison. However, as I 
recall the 28-70 had the reputation of being a very sharp lens that had a fatal 
construction flaw; one of the lens elements would delaminate. If you believe 
the stories, it was not a question of whether your copy of the lens was going 
to delaminate, rather it was a question of when.

I was wandering through eBay recently and noticed a 28-70 for sale at a very 
reasonable price. In the fine print the seller noted that they had not gotten 
the sharp images from the lens that they expected and thought maybe one lens 
element was out of alignment. I think they had one of the infamous cases of 
delimitation. For which, AFIK, there is no cure.

stan

> On May 20, 2016, at 1:08 PM, Ken Waller  wrote:
> 
> Other than the obvious focal length difference and AF drives, I'm wondering 
> what list members think of the two - one better than the other etc.
> 
> Kenneth Waller
> http://www.pentaxphotogallery.com/kennethwaller 
> 
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Re: DA*16-50mm/2.8 and FA28-70mm/2.8

[mike wilson]

I had a loan of the 28-70 and an MZ-s body for about five months.  Apart from
being plastic-bodied, I couldn't fault it.

> On 20 May 2016 at 18:08 Ken Waller  wrote:
> 
> 
> Other than the obvious focal length difference and AF drives, I'm wondering 
> what list members think of the two - one better than the other etc.
> 
> Kenneth Waller
> http://www.pentaxphotogallery.com/kennethwaller 
> 
> 
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DA*16-50mm/2.8 and FA28-70mm/2.8

[Ken Waller]

Other than the obvious focal length difference and AF drives, I'm wondering 
what list members think of the two - one better than the other etc.


Kenneth Waller
http://www.pentaxphotogallery.com/kennethwaller 



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