First a question to those who use the Canon EF 100-400mm F4.5-5.6 USM IS lens. Have you used a polarising filter with it? If so did it focus properly? I ask as I have a Fujiyama Digital P.L. filter. When it is on the lens the camera (50D) appears to focus, camera beeps and red dot lights up, but the photos are out of focus.It was tried in bright conditions where I was getting values of f8 and f11 so the image should have been bright enough. Is there something faulty with my filter or is it that the lens doesn't respond properly with a polarising filter? It behaves just fine with my UV filter.
Last night there were two different Hedgehogs visiting. Horace (should really have named him Horatio) was recognisable by his one shiny eye. (No soundtrack. Uploaded to Flickr for a change)
If you enjoy watching our night time visitors then you can see more Hedgehog activity on HOGBLOG and TWOSIE THE HEDGEHOG blogs.
Other updates:
Once again the Blue Tits have been conspicuous by their absence from the nestbox though they are still visiting the feeders.
A week after the frog spawn appeared I was pleased to see a second batch. Both are now in the nursery pond. Yesterday I saw that some of the first batch were changing from a full stop to a comma shape so things are looking much better than last year when none was fertilised properly and there were no tadpoles.
John have had the same problem on a Sigma 50mm-500mm. Traced to a thumb print on the inside of the filter. Also focus is dodgy in rain.
ReplyDeleteI don't use a filter of any sort on mine John.
ReplyDeleteI figure the lens hood is large enough to protect the front element, plus it's less 'glass' to shoot through.
Hello Adrian. Thought you had solved things there. Found a couple of prints I had missed before but a good clean made no difference.
ReplyDeleteHelo Keith. I was hoping to cut out some of the reflections when I'm photographing things in the pond.
ReplyDeleteJohn
ReplyDeletePolarizing Filters will reduce the amount of light reaching your camera's sensor by about 2-3 f-stops. This means that the risk of a blurred handheld shots are more likely. It also depends on the location of the sun in relation to your position. Polarisors are OK for reducing glare on say bright blue skies, but other than that I just wouldn't bother with them. I don't use them anyway. I have a basic UV filter on mine to give that extra bit of protection, considering how much I had to pay for it in the first place.
Thanks for that Roy. Yes they are rather dense. I just wanted to take out some water reflections on the pond. More experiments seem to show this filter just does not give a clear picture, even with manual focus.
ReplyDelete