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03-24-2012, 09:06 PM   #1
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K-01 with big lenses:

Just added a new photo to the review:

Pentax K-01 Camera Review - Construction and Handling -

I'm not sure why I forgot to add it originally, as it's some great lens porn!

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03-25-2012, 05:40 AM   #2

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As pictured above, big lenses, such as the F* 250-600mm F5.6, can be used with the K-01. The only issue when mounted on a tripod is that the AF isn't stellar, and that the screen can be hard to see at times. You'll notice this trend with most long telephoto lenses, as they're simply not meant for use with CDAF.
The LCD is easy to see with a LCDVF and focus peaking makes focusing with large MF lenses very easy to do.

03-25-2012, 07:10 AM   #3

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I personally have observed only minor issues with a lens that is rated starting below f4.5 to about f5.0 depending upon the lens. For instance...

Sigma 50-500mm F/4.5-6.3 APO DG OS HSM Lens for Pentax 738109

I do not yet own the above mentioned Sigma, but... It would in fact work effectively while at it max opened aperature at the minimum focal length, but... One may have an issue as it gets towards the 6.3 aperature range, but it would also still be usable to some extent. Also please note how most lens' in general might be effected by a teleconverter - and also most cameras (even outside of the K-01) as well.

Also noting...

Pentax Zoom Telephoto 60-250mm f/4 ED DA* SDM Autofocus 21750

I do own this Pentax lens - with a constant aperature range across the zooming focal length. Most lens' do not in fact keep a continual aperature across their zoom range - which is unfortunate, but it also helps to keep a lens within certain size and weight factors - as well as cost.

But I've never run into any issues with this lens - as it is indeed an f4.0

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