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By biglog
Another shot taken at Gosport during the P1 Superstock racing .Here we have Arran Scott and Gavin James Feldt in boat 99 overtaking boat 11 driven by Nick Williams and navigator Martin Robinson.

This was probably at the edge of the lens capabilitys distance wise as it was probably nearly, complete guess but 600 metres away in poor was taken with a Uv filter on..i later took this filter off as it was smeared with seawater and lens was having difficulty on auto focus..To my surprise the quality of the photos after I took off the filter and left it off for remainder of day appear to be better, even though conditions stayed more or less the same..

Does this mean UV filters can effect quality of pictures and hinder the auto focus on the camera.? The filter used was a Sigma own brand.



Tags: Sports and action Gosport Speedboats

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dark_lord Plus
16 2.7k 734 England
16 Aug 2015 4:38PM
A well timed capture. The drama is provided by the boat that's out of the water.

This image is more letterbox than the camera's normal frame so I suspect a crop. This is close in on the action but if you've only cropped top or bottom that's fine - if you've cropped frm the side you may consider an alternative with a bit more space for the boats to 'move into'. Not essential and it's good as it is.

However it's on the washed out side a little less exposure is required - 1/1250 or even 1/1600 would have been the order of the day and that's help with freezing th eaction too.
I've just darkened the image down a bit in my mod and warmed the colours slightly but not so much as to remove the look of the poor conditions.

biglog 7 42 2 United Kingdom
16 Aug 2015 6:28PM
Thanks Keith for the in a lot of the boat photos the letterbox format does seem to work best as you have done ..also agree about being washed out.

dudler Plus
17 1.4k 1774 England
17 Aug 2015 11:32AM

I normally avoid filters completely. In these conditions, I might well have put one on, as salt water attacks the coating on lenses. I hope you cleaned the lens thoroughly (including a 'rinse' with clean water!) afterwards.

The answer is yes - every piece of extra glass you put in the path degrades the image - but, usually, only very slightly.

Did you clear spray from the lens more often than from the filter? Or, maybe, the filter was significantly further forward than the front element of the lens? (I don't know about long lenses: some of the kit I use almost has built-in hoods, because the front element is recessed behind the filter ring. In such cases, even with a lens hood on the front of it all, adding a filter puts the front piece of glass further forward, and more prone to catching non-image-forming light if it is dirty or wet.
dark_lord Plus
16 2.7k 734 England
17 Aug 2015 7:33PM
I forgot to answer your question, which John has done.

I haven't tested critically for myself but after removing a filter from my lenses there seemed to be an improvment in some shots. Mind you I use(d) top of the range Hoya filters. The issue only became apparent with the high pixel count cameras. I still keep one in the bag for the really inclement conditions as you had here. Treat it like any other accessory, like a flash or cable release, there if and when needed but not for every shot.

And after all that I've never used a filter on my long lenses - I don't think you can get one and if you coule I'd hate to think what the price would be!
biglog 7 42 2 United Kingdom
17 Aug 2015 8:36PM
Thanks John and Keith..interesting to hear your thoughts on the filters.

The lens did have a fairly long hood which I was using and I did try to keep wiping the filter and the lens..i think the biggest factor which seemed to improve the quality of the shots was due to speed of the boats the auto focus needed to work quickly without searching and it did so much better without the filter. Have to say slightly worried about the salt water and the lens coating as I have not rinsed with water yet. Was constantly wiping with rag and mixture of fresh rainwater hoping my lens will be ok,,fingers crossed.

For now going to leave of filter and see how the results go which is a shame as filter was over £100. however sure a Hoya would have been even more..but maybe results would have been better.



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