Pentax 560mm lens now listed on Adorama...any takers!

Started Nov 5, 2012 | Discussions thread
viking79 Forum Pro • Posts: 14,149
Re: Overpriced product - just buy Sigma 500/4.5

temama wrote:

Alex Sarbu wrote:

temama wrote:

Pentax 560mm is clearly not designed for sale. Buy Sigma 500/4.5, I think you get a better lens for much less money.

Why do you think the Sigma is a better lens?


Sigma 500/4.5 is well build fast 500mm lens, IQ wide-open (at f/4.5) already good and very sharp at f/5.6. Excellent sharpness at F8.0. Weight only 3.15kg.

I'm also pis*ed off that pentax is playing with us with such a marginal BS product.

Iit seems like an 100 mm aperture telescope is maybe $400 for a cheap one, but I think those are only 2 elements or so.  The better designs with 4 elements seem to be $1000 to $2000, so the Pentax with 6 elements is probably a more expensive design, and I imagine the extra elements are related to autofocus?  But it has nearly 20 feet minimum focus distance.  I don't know that I could use it for much of anything.  Hopefully they put a good focus motor in it, I think it is one of those newer DC motors which is good, but lets hope it is also very fast or something.


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