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03-02-2012, 02:12 AM   #1
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560 mm

A lot of debate is going on about this lens, but typically not in a dedicated thread.

What would you expect from this lens?
AF, size, ED glass, close up focus, performance

How does the lens fit in the Pentax porfolio?
There is currently no 2.8/300 in the Pentax portfolio, but a 5.6/560 would compete against a more versatile combo like the Sigma 2.8/300 + 2x TC or a Sigma 4.5/500.
Carrying a 4/300 and a 5.6/560 or a Sigma with TC - what would you prefer?

The 300 mm Sigma combo with TC costs aproximately $3500. Add a 1.4x TC as well to make it $3750. The weight is 2.4 kg for the lens only.

The Pentax lens should be superior in quality to the Sigma with dedicated 2x converter. DA* ED glass could help. SDM autofocus would be a feature not available from Sigma (for Pentax).
The weight should not exceed the weight of the Sigma combo. Less than 2.5 kg - the 4.5/500 mm from Sigma weighs 3 kg.
Pricewise $3000-4000 would be fair. The Sigma 500 is $5000, but offers f/4.5. Anything more expensive would not fit in the portfolio as the second most expensive lens would be to far away feature and price wise.

I think price and size are key factors here. A 2.8/300 from Penatx would costs $5000+ (check out Canon/Nikon pricing). There is no significant market among Pentax customer base for such an investment - used lenses, 3rd party options are too appealing. Make an appealing long lens and keep the price low at around $3000. Give the lens a nice form factor to separate it enough from 3rd party glass. That's your lens. Think about it, it's a smart move by Pentax.

...and make sure to provide a real good 1.4x TC. The performance of the Sigma with 2x and 1.4x TC should be beaten by a 560 mm plus a 1.4 TC from Pentax.

03-02-2012, 04:51 AM   #2
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Nice thought Zapp but this one is ALL about the 560 mm
03-02-2012, 06:44 AM   #3
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