It’s just bokeh, IMO. The background is very busy with small spruce needles intertwined with cedar needles and dead branches, all of which were brighter lit than the cardinal. There’s not a lot of sharpening here, but it’s a considerable crop, so noise and other problems are magnified. This shot would have been a mess with my A 400/5.6. Thus far, the 150-450 seems to generate good bokeh, but with any lens, the look is largely a product of what is back there. In this example, it rendered the out of focus elements in a much nicer fashion: http://photo.net/photodb/photo?photo_id=18146695&size=lg > On Jan 6, 2016, at 7:10 PM, Igor PDML-StR <pdml...@komkon.org> wrote: > > > Paul, > > It is a nice picture, but I am curious about a certain aspect of it that > might be a characteristic of the lens: > The background (especially the green from the tree right in the middle of the > photo) seems to have some type of high-frequency "jitter". > I wonder what's the origin of that? > I could see a few different possible sources: > 1. strange bokeh in combination with the small features of the tree > 2. camera shake (motion blur) that is compensated for the in-focus items, but > not quite for the background. > 3. sharpening combined with one of the above > 4. ... (?) > > What do you think? > > Igor > > > > On Wed, Jan 6, 2016 at 2:10 PM, Paul Stenquist wrote: > >> Took a break and sat outside at noon today. This guy was too distant - the >> pic is only about 30% of frame - so it.s nothing special. But it's a nice >> example of lens performance. K-3 DFA 150-450, f5.6, 1/1250th, ISO 1250, >> handheld, 450mm. I like the way this combination locks in focus, but at this >> distance, about 70 feet I'd guess, finding the critter in the tree is a >> chore. But once I get a single point on him, it.ll lock right in. >> >> http://photo.net/photodb/photo?photo_id=18154948&size=lg >> > > -- > PDML Pentax-Discuss Mail List > PDML@pdml.net > http://pdml.net/mailman/listinfo/pdml_pdml.net > to UNSUBSCRIBE from the PDML, please visit the link directly above and follow > the directions.
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