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Re: Lens Hood question
You couldn't be more on-course if you had a GPS and compass.
Yes, the little door on the underside of Pentax plastic petal-style lens hoods is to allow access to adjusting polarizing filters without removing the entire hood.
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The polarizer filter is comprised of two rings. One screws into the threads on the front of the lens and the other turns freely. Look at the filter closely, then grasp the ring closest to the lens and turn that one counterclockwise to unscrew it from the lens. If it's on too tight or you can't get a good grip on it, try wrapping a rubber band around it.
The lens error is due to failure of the lens control system. You can remove battery and card replace battery and while switching on tap the lens hood on your hands so as to disengage any dirt or mechanism being struck. Use some air to blow between the lens to dislodge any sand particles struck inside. If none of these works then you can think of taking consensus with the service centre as it canbe failure of the control/drive unit. get estimate before you decide. It will be good to have it checked at the Pentax service as you do not have to run around for spares.
If it's a DG UV (ultraviolet) filter, it cuts reduces the ultraviolet light reaching the lens. UV light scattered from particles in the air is what produces much of the haze that can obscure distant objects like mountains. Other than that, it has little visible effect. Some photographers like to keep an UV filter on their lenses at all times, on the premise that it's cheaper to replace the filter instead of the lens should it bash into something.
If it's a DG Circular Polarizer filter, that's something completely different. A polarizer cuts light waves bouncing in a particular orientation. You get this kind of light in reflections from glass and water, for example. Try looking out a window through the filter. By turning the filter (it has a rotating ring on it), you should be able to accentuate or reduce reflections and glare. It can also darken the sky, reduce reflections from leaves, and has other effects. The best way to explore its uses is to go out on a relatively sunny day and look at things through it. Try taking pictures with and without the filter and compare the results.
Since the D60 meters through the lens, you don't have to do anything to compensate for either filter. Just put it on and take the picture.
If you have any other questions, please feel free to ask.
I had the same problem the lens wouldn't retract and it would only stay on long enough for the logo to show...I found out my lens changed slightly cooked to oneside I gently moved the lens to center and now it works great...look at the lens and see if this helps
Skylight filters don't generally block UV, they change the colour tint optically, which you can do without danger of image degredation in post-processing, so I woudn't really recommend using a skylight filter for digital cameras.
I haven't tried a UV filter on my fz10, only my circular polarizer. From what I've heard however, a uv filter may act as lens protection (or use the lens hood), and might in some circumstances reduce haze (rarely), and there are unconfirmed rumours of possibly reducing purple fringing. If anyone could ever confirm this, I might consider one. Otherwise, UV filters also seem peripheral for digital photography.
Probably the most important optical filter you can use is a polarizer. This can cut a lot of excess scattered/polarized light and reduce excess contrast, increase sky colour saturation, etc. It's effects are extremely difficult or impossible to get in editing.