They are used particularly in highquality lenses allowing for the use of fewer lens elements so that a high luminous intensity is attained. Extra-low dispersion ED lens elements Normal glass lenses tend to divide the incident light into its various colour components, as a prism would do. This happens particularly at the edges, adding unwanted colour fringing to the photo. The longer the focal length of the lens the more apparent is the fringing effect.
ED glass is an exceptionally highquality special glass that prevents this socalled chromatic aberration to a very great extent. Inner Focusing Each lens is composed of several groups of lens elements. With an Inner Focusing design only one of these groups is moved. Telephoto macro prime lens Pentax KAF Pentax smc DA mm F Telephoto zoom lens Pentax KAF Telephoto prime lens Pentax KAF3 Tweets by dpreview.
Nikon Z9 initial review. Sony a7 IV initial review. Nikon Nikkor Z mm F2. Sigma mm F Discover more challenges ».
Nikon Z9 3. Popular interchangable lens cameras ». Popular compact cameras ». Since both aberrations are addressed with in-camera corrections neither would be an issue.
Autofocusing was a mixed bag and hunting occurred frequently in the AF-S mode when focusing on close subjects and with low-contrast scenes. The lens often lost focus in the AF-C mode while following moving subjects when shooting video. Backlit subjects were mostly handled well, partly because the K-3 III can record a relatively wide dynamic range. However, bright areas in backgrounds caused frequent problems with the AF system, leading to a second or two of hunting.
As usual, bokeh in close-ups at wide aperture settings depended a lot on background lighting. We found some odd-looking donut-shaped highlights in some shots, while highlight outlining was relatively common.
The 50 cm close-focusing limit of this lens restricts its use to larger subjects, even at the mm focal length, where the maximum magnification is roughly one fifth life size. Conclusion Please Login or Register to access the Conclusion. Picture angle : Rectilinear distortion at 28mm. Rectilinear distortion at 35 mm. Valeriu 64's gear list: Valeriu 64's gear list. Reply Reply with quote Reply to thread Complain.
If your lens leaks, Pentax will claim that you misused it. Valeriu 64 wrote: Dear Ari , how could I explain to you better , this to understand? Regards, Valeriu Thank you Valeriu. Ari -- hide signature Joseph Tainter wrote: If your lens leaks, Pentax will claim that you misused it.
Joe This is what I fear. I met this, very often. LaRee's gear list: LaRee's gear list. Ari Aikomus wrote: Water-damaged Z: not covered by warranty?!?! Ari Condensation is not the same as water leakage.
Ditto - no sign of a problem here but I've never submerged one You're not supposed to of course -- hide signature Regards Dean - Capturing Creation N. All my Images are Protected by Copyright. Ari Aikomus wrote: I really hope that the camera manufacturers not only Pentax define exactly what Weather proof means, and how they guarantee WR!
As the saying goes, resistance is futile;- -- hide signature As the saying goes, resistance is futile;- That's what I think about this too, unfortunately so. Ari Aikomus wrote: peterpainter wrote: Ari Aikomus wrote: I really hope that the camera manufacturers not only Pentax define exactly what Weather proof means, and how they guarantee WR!
Ari To be fair, though, from other people's experience with Pentax gear it seems that there is weather-proofing of varying degrees provided, so it is a bit more than marketing and promises. But, for example: how effective? F Forum M My threads. You may also like. Latest sample galleries.
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