UV Filter needed???

Mark Johnson

Mark Johnson

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Different lenses may produce different colour casts, particularly if the camera is set to auto white balance. I believe that most sensors also have a UV filter built in.
 
Sorry if I have loused up the number of photos uploaded. Only supposed to be two!

Are you saying we don't need any filters? the short lens has one and is a much better photo?
 
all digitl sensors have a UV filter built in. You don't need one on the lens as well (to filter UV) as it will add (or filter) nothing.

There could be a million and one reasons number 2 is a better photo
 
I think that the issue is to do with there being a light haze present and the image taken with the wider lens has a much reduced exposure compared to the tele image. At this small size I can still see there's little shadow detail in the same section of the image as the tele picture, but everything is much darker because the exposure is compensating for the intensely bright sky. If you darken the tele image and increase contrast a little then it will come out looking just like that section in the wide image.
 
The shorter lens could well be better than the telephoto which could account for the extra apparent clarity of colours. If possible, reshoot with the shorter lens with and without the UV filter fitted.

Possibly a silly question but the images are from a digital camera, aren't they?
 
Yes Camera is a Olympus EPL5..

And I have resized so they seem to have lost their properties...

Mj
 
View attachment 33371

More contrast and a bit darker, using Windows 8 photo. Also full size photo.

Much better, but still not as crisp as I would hope. However the photo was handheld, and the subject is almost a mile away.

Thanks for info re filter, that will save a few squids.

MJ
 
I was always led to believe that you only needed two kinds of filters for digital photography - polarising and neutral density. The solar eclipse last week taught me that for certain specialist uses you need a third - a solar filter.

Some photographers use UV filters to 'protect' the lens. This has led to one of the all-time great debates on photography forums the world over - to UV, or not to UV?

The answer, of course, is not to UV. :exit:
 
Mark Johnson said:
View attachment 33371

More contrast and a bit darker, using Windows 8 photo. Also full size photo.

Much better, but still not as crisp as I would hope. However the photo was handheld, and the subject is almost a mile away.

Thanks for info re filter, that will save a few squids.

MJ
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Try enlarging that same area on the wide image to the same size & compare mistiness. :)
 
Phil V said:
ooh! a UV filter thread, is it that time of year already?
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Oh Gosh, I hope I have not opened some old sores!!:):)

Been a amateur Photog for many years, but new to this sort of forum.

Learning loads, so thanks for the patience.

As a land surveyor, who used to use telescopes a lot, I can concur that high magnification just magnifies everything, haze etc and not just the hoped for image.

So my expectations are too high. Especially looking over the sea.

Mj
 
Whilst lighting is not ideal, assume the blue haze will be cut out by a UV filter.
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I think you've just answered your own question.... you used to be able to get a 'Haze' filter - slightly pink. Re-adjust your white balance so the darkest shadow is black instead of dark blue and you'll be half way there.

Haze is blue, UV is err, violetty!
 
Mark Johnson said:
Oh Gosh, I hope I have not opened some old sores!!:):)

Been a amateur Photog for many years, but new to this sort of forum.

Learning loads, so thanks for the patience.

As a land surveyor, who used to use telescopes a lot, I can concur that high magnification just magnifies everything, haze etc and not just the hoped for image.

So my expectations are too high. Especially looking over the sea.

Mj
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It's not old sores (twas just a joke), these threads do have a history of kicking off though.

The forum is ace, I learn something new most weeks here.
 
haze isnt UV though. its just light refraction in the atmosphere. You can tweak it by use of the blue slider in whatever image editor you like. Ive an "anti haze" filter from lee which has a pinkish tint to it, supposed to counteract the blue tint of haze a little. You might find a polariser helps cut through it a little as well. But a UV filter wont do anything, its just a piece of clear glass.
 
AshleyC said:
haze isnt UV though. its just light refraction in the atmosphere. You can tweak it by use of the blue slider in whatever image editor you like. Ive an "anti haze" filter from lee which has a pinkish tint to it, supposed to counteract the blue tint of haze a little. You might find a polariser helps cut through it a little as well. But a UV filter wont do anything, its just a piece of clear glass.
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My three UV filters are all a very pale yellow. Hard to see unless you put the light through them twice, as happens when you place it onto a piece of white paper. Doubles the apparent strength of the filter. Whereas I do have a lens protection filter, not a UV filter, which is absolutely clear plain glass (with anti-reflective coatings).
 
A UV filter does do something.... It filters UV. We can't see UV light innately but when everybody was using film it had a profound effect on emulsions/dyes to such an extent it exaggerated blues, hence everybody was buying UV filters.
 
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chuckles said:
A UV filter does do something.... It filters UV. We can't see UV light innately but when everybody was using film it had a profound effect on emulsions/dyes to such an extent it exaggerated blues, hence everybody was buying UV filters.
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And for digital the uv filter is on the sensor. Hence adding a second one of the lens does nothing
 
UV filters do nothing at all. Nada. Useless for digital.

These were invested for the film age where UV light had the potential to affect the film.
 
boyfalldown said:
And for digital the uv filter is on the sensor. Hence adding a second one of the lens does nothing
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And the only reason it is on the sensor is not that it affects the image on a digital sensor, it's there to protect the sensor from UV which can damage it.
 
Wow, we are learning fast. UV is violet, but a very special violet I gather. Just a lens protector then.........

Mj
 
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