The Pentax A lens will work with all metering modes. The Vivitar will 
meter only in manual mode with the green button workaround. Perhaps 
better than both, although slower, is the DA 50-200/4.5-5.6.
Paul
On Feb 11, 2007, at 7:50 AM, David J Brooks wrote:

> My experiences are the same as Bob's.
>
> Dave
>
> On 2/11/07, Bob W <[EMAIL PROTECTED]> wrote:
>> The SMC A 70-210/4 is a great lens. They are very good value for money
>> and worth having. I haven't used any of the Vivitars, so can't make
>> the comparison.
>>
>> --
>>  Bob
>>
>>
>>> -----Original Message-----
>>> From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On
>>> Behalf Of CHRISTOPHE GRYSPEERT
>>> Sent: 11 February 2007 11:31
>>> To: [email protected]
>>> Subject: 70 210mm
>>>
>>> I am looking for an additional lens to complete both my k100d
>>> and continue
>>> with my k1000 as well.
>>>
>>> I noticed that there is quite an availability for the pentax
>>> A SMC 70-210mm
>>> f4 on the internet at very reasonable prices.
>>>
>>> The other alternative I see is a vivitar 1 series (3rd) 70
>>> 210mm f2.8-4.
>>> Seems that this lens (according articles) delivers very good optics.
>>>
>>> Since I havenot use any of the two, I doubt on whcih one is
>>> the better
>>> choice.
>>> The pro for the vivitar seems to me the f2.8, but unsure if
>>> the comparison
>>> is correct. the Vivitar seems also a bit heavier...
>>>
>>> thoughts?
>>> chr
>>>
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>>
>>
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>
>
> -- 
> Equine Photography
> www.caughtinmotion.com
> Ontario Canada
>
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