The Sleeping Giant's Sea Lion

by Jakub

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0

This is kind of a hard head-to-head comparison, but basically, the EF-S 17-85 was an upgrade over the contemporaneous 18-55 kit lenses of its day (2004)--the non-USM, non-IS first version. The IS STM version of the 18-55 kit lens, however, is something like the eighth version of that lens, introduced in 2013, so it's a spanking new design, and probably ...


2

Agreeing with the answer in the thread you've linked, I don't believe there are hard limits for this. One day, one might invent a magical design or optical elements that would achieve unimaginable, super-large apertures. But, as mentioned in that thread, there are so many soft limitations. Since the size of the back element, and the distance between the ...


4

Yes, you can buy non-stabilized optics for a Pentax. In fact, very few stabilized lenses are available, because all Pentax digital bodies since the 2006 model K100D (excluding K110D) have provided the Shake Reduction sensor stabilization, so there's no need to have stabilization in lenses. Yes, image quality is comparable to optic stabilization since it is ...


-1

I have long explanation here: http://jtra.cz/stuff/essays/bokeh/index.html Note that Apodization filter may prevent to perform phase detection auto focus, the 56 APD only uses contrast detection AF. The (only) other well known photographic lens with apodization, the Minolta/Sony 135 STF f/2.8 t/4.5 was only manual focus for same reason. See also these ...


6

Bokeh is formed by many points of light spreading out, passing through the aperture and being projected onto the image plane as series of overlapping discs (assuming a round aperture). This can lead to harsh textures and effects when there are strong contrasts in the out of focus parts of an image, especially when lenses feature overcorrected spherical ...


1

Yes, the manual focus mode on lenses let's you manually change the point of focus. Actually what you're setting is the plane of focus, an entire plane, perpendicular to the optical axis, where the image is in focus. The distance to the plane of focus is not constant though, the larger the angle from the optical axis, the longer light has to travel to get to ...


1

I think you pretty much answered your own question, there's no hard limit as such. If you really wanted to, you could have a huge aperture and use corrective lenses to bring everything towards the sensors, but you run into two issues: price generally goes up to the square of the size of the glass, having this much would cost a lot image quality would ...



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