Pentax’ new full-frame lenses

5 Feb

In along with announcing a new full frame camera, Pentax has given details of the two lenses first shown at Photokina that will also support full frame photography.

D-FA* 70-200mm f/2.8

HD Pentax D-FA* 70-200mm f/2.8

The 70-200/2.8 lens is constructed with Aero Bright Coating II in addition to HD coating. According to the press release, this is “a lens-coating nanotechnology that employs a super-low refractive film fabrication process to assure light reflectance lower than that of the conventional Aero Bright Coating”. In addition, it includes a number of sophisticated glass types to minimise aberrations, according to the press release, including “Super ED glass” with properties similar to fluorite.

Wikipedia has this to say about fluorite:

Optical elements made of calcium fluoride, namely of fluorite crystals, are used in some telephoto lenses, to correct color aberration. They are however being replaced with various low dispersion glasses, which have higher refraction index, better dimensional stability, and lower fragility.

Both lenses are weather-sealed to the AW specification (Pentax also maintains the WR label to indicate a lower degree of weather resistance).

Both lenses also have a new kind of focus motor that among other things offers improved quick shift control. Quick shift is Pentax’ name for seamless transitioning from automatic to manual focussing, which is a feature of all ultra/hyper/supersonic drive lenses of any manufacturer (to the best of my knowledge), but in more affordable screwdrive lenses is exclusive to Pentax.

Both of these new lenses are direct current motor driven, and Quick Shift can be set either to ensure autofocus completion, or to allow the user intervention at any point in the autofocus process, leading (if I understand correctly) the autofocus to fade out and relinquish control. Manual focus can also be set as a third alternative – apparently both on the camera body and lens (so MF would have to be disabled both places for any AF to take place).

HD Pentax D-FA 150-450mm f/4.5-5.6

HD Pentax D-FA 150-450mm f/4.5-5.6

Lens prices at launch will be:

  • D-FA* 70-200mm f/2.8 €1999 / $2299.95
  • D-FA 150-450mm f/4.5-5.6 €2199 / $2499.95

hd_lenses_composite2

It’s rumoured that three to four lenses for full frame will be released in 2015 (so perhaps one or two other than the above), then another “six or eight” in 2016.

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One Response to “Pentax’ new full-frame lenses”

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  1. Pentax announces full frame – get all the details | breakfastographer - February 5, 2015

    […] unnamed camera is rumoured to have in-body image stabilisation (IBIS/sensor stabilisation) as the two telezoom lenses announced with it do not come with their own image […]

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