Nidelva river through Trondheim Norway

Nidelva river through Trondheim Norway
by Saaru Lindestokke                

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0

When stopped down, does light still pass through all of a glass element behind the aperture blades? No (Assuming the rear element is large enough to pass through all of the light allowed through by the aperture when it is wide open). Does this mean that light only passes through the middle of each lens element behind the aperture blades? Yes. ...


1

The answer to the first part of your question is yes. The answer to the second part of your question is dimmer, increased flare, and poor focus if you use white material and with slightly less flare with darker material. The size of the hole will determine the amount of light fall-off and the annular size will determine the amount of focus degradation due ...


1

The older (50's-60's) large format Schneider Symmars that are "convertible" fit this description when used with the front group removed. My 135/235 isn't wonderful used as a 235 with the front group removed, but it's not awful either, at least by f16. Suspect there are other convertibles (Cooke?) that this is also true for.


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I eventually found out that MS SuperTriplet Perar 24mm F4 and MS SuperTriplet Perar 28mm F4 were objectives which I tried to recall. They are M-mount objectives meaning that they are not tied to a specific camera. I did not find any concrete words about iris placement but every photograph of these objectives suggests that iris is in front. Here is an ...


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In other words, a 50mm f/1.8 lens on an APS-C camera would act more like a 80mm f/2.8 (approx. 1.8 * 1.6x) lens in 35mm equivalent — for depth of field, not considering exposure. Yes, a 50mm f/1.8 lens on an APS-C camera would act more like a 80mm f/2.8 (approx. 1.8 * 1.6x for Cannon) lens in 35mm equivalent, as far as DOF and to some extent image noise ...


7

The actual focal length range of the lens on your G7X II is not 24-100mm, it is 8.8-36mm. Coupled with the smaller sensor (13.2 x 8.8 mm) of the G7X II the 8.8-36mm lens gives the same field of view as a 24-100mm lens does on a full frame (36 x 24mm) camera. Similarly, the aperture of f/1.8-2.8 will behave, in terms of Depth of Field, like an aperture of ...


0

Modern Pentax SLRs don't have stop-down aperture coupler on the body mount - mechanical linkage that links to lens aperture ring. Why? Because modern cameras communicate with the lens using electronic or digital signal protocol, thus rendering mechanical protocol unneeded. Because mechanical components have higher costs (more finely machined, moving parts) ...


2

It's an old question ( EG http://www.dpreview.com/forums/thread/2714173 ). The short answer is that it is most advantageous for Video, because when you zoom in everything doesn't get darker. For single frame Photos you can adjust ISO and Shutter speed (the automatic Setting will do it for you) on a shot by shot basis and get all Photos similar; in a Video ...


5

The whole point of Tv mode is that you don't adjust the aperture; the camera meters the scene and calculates the aperture based on the selected shutter speed and ISO setting. If you want to adjust the aperture, use Av or M mode. You might also need a tripod if your shutter speed is consequently too slow to hand-hold. As to the "milky water", I think what ...



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