Is it advisable to keep a filter screwed permanently to the lens for protection and if yes, would you recommend a UV or something else.
Also, can you use a UV and CPL filters together.
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Like Scott I keep a filter on at almost all times to minimize having to clean the front element of the lens. I'd rather get grit and munge on a filter than the front element. On paper adding another glass element will degrade the image, but in practice it seldom makes any discernible difference. Where it can is a flair situation and then it is easy to remove the filter to take the shot.
I know some folks who leave a filter (usually UV or Haze) on their lenses and some who do not. I have seen a filter save a lens from damage. If I were doing studio work or shooting at a particular location I would probably not have a filter on my lens. When shooting sports with all the potential impacts from weather - rain, snow, wind and dust, mud, etc. - I keep a filter on each lens for protection. Nikon actually shipped my 200-400 (which has a filter drawer) with an external filter to protect the front element. I doubt you will see any issues with image quality if you purchase a decent filter.
There are two situations when a filter can become a problem.
The first is when shooting against the light, where you can get veiling flare just as Scott warned.
The other is when shooting something well lit or a light source at night when the dark background turns the filter into a mirror and the light parts that have been reflected from the sensor bounces back into the lens again from the filter producing ghost images.
There are even better protective filters today when the UV protection is omitted. Hoya 67mm HD Protector Filter XHD67PROTEC B&H Photo Video
The UV protection made for better photos in the film days, but there is an UV cut filter in front of the sensor already.
i only keep my filter on to protect the lens when at home or out taking action shots or wildlife or portraits when elements will effect the lens. if in place where no elements around take filter off. since do not need. since i mostly do surfing, soccer paintball baseball and softball i have to leave filter on since action sports. if doing wildlife depends on place if in woods no but out in open yes. you find out when it best to have filter and when not need filter.