**Any** news or even rumors on a WA DX lens?

Started Nov 19, 2010 | Discussions thread
_sem_ Veteran Member • Posts: 5,023
Re: Like this Pentax lens?

bgorum wrote:

I have the Nikon 12-24, but it does not focus close enough (I noticed the Pentax 15 gets down to 7.1 inches, much better than the 12 inch mfd on the Nikon 12-24).

There may be a workaround or two for close-focus at WA.

One is a very thin K5 extension tube, said to be useful with the AIS 20/3.5. Compatibility issues with modern lenses, especially G-style. Maybe also too thick for ultra-wide-angle.

The other is optical relay (made by reverse stacking a prime lens, just like one of the ad-hoc macro things) with the WA lens at a suitable distance in front. Not the most convenient setup around, likely affects IQ with all that glass, and limits the aperture, but may work for an occasional close-up, also for macro. Also, the Frazier patent says the relay may shrink the FL of the tip lens by a third (just about the crop factor).


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