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Search: Posts Made By: stephenB
Forum: Insects, Dragonflies, Arachnids, Beetles & More Friday 13th July 2018, 20:52
Replies: 10
Views: 846
Posted By stephenB
Fascinating and tantalising record! Adam - did...

Fascinating and tantalising record! Adam - did you get any more info at all?

There is a photo on Flickr - see here (https://www.flickr.com/photos/[email protected]/42311275584) - ID looks good, but where...
Forum: Vacational Trip Reports Sunday 22nd August 2010, 14:41
Replies: 3
Views: 1,747
Posted By stephenB
I stand corrected! For some reason I just assumed...

I stand corrected! For some reason I just assumed they were Little's and never looked at things like the leg colour closely enough. I've changed the page and thanks for pointing out the...
Forum: Vacational Trip Reports Sunday 22nd August 2010, 09:10
Replies: 3
Views: 1,747
Posted By stephenB
Triplet of northern birding reports: Finland, Sweden and Scotland

I had a busy May and June earlier this year, with short birding trips to three different places. There are now illustrated trip reports on my website for the following:

1. Oulu area of Finland...
Forum: Canon Sunday 1st November 2009, 10:41
Replies: 0
Views: 790
Posted By stephenB
Resolution measurements: 50D redeems itself!

In July I posted a thread (http://www.birdforum.net/showthread.php?t=147765)showing results of quantitative measurements of noise levels on raw images from the 50D, 40D and 350D. Amongst other...
Forum: Canon Sunday 16th August 2009, 07:57
Replies: 49
Views: 6,457
Posted By stephenB
I didnt intentionally underexpose! The first few...

I didnt intentionally underexpose! The first few shots just came out like that. But surely it is interesting to see if something reasonable can be recovered from them?

For the 50D shots, I used the...
Forum: Canon Saturday 15th August 2009, 16:20
Replies: 49
Views: 6,457
Posted By stephenB
By popular request, I have also added to my...

By popular request, I have also added to my website page (http://www.stephenburch.com/noise/noise.htm) the Yellow-legged gull example, to illustrate that the effects seen on the graphs can also be...
Forum: Canon Saturday 15th August 2009, 15:53
Replies: 49
Views: 6,457
Posted By stephenB
I'm afraid I disagree! Its the per pixel noise...

I'm afraid I disagree! Its the per pixel noise that determines the inherent quality of the image, not some measure that happens to depend on the magnification you want to use on any particular image....
Forum: Canon Thursday 13th August 2009, 20:22
Replies: 49
Views: 6,457
Posted By stephenB
Just to let readers of this thread know that I...

Just to let readers of this thread know that I have written a fuller account of my measurements of noise level on raw images from the 350D, 40D and 50D, together with the methods used. These were the...
Forum: Canon Sunday 2nd August 2009, 08:30
Replies: 49
Views: 6,457
Posted By stephenB
Yes there does seem to be quite a lot of...

Yes there does seem to be quite a lot of contradictory stuff on this subject on the web. The respected(?) DP review has a page which supports my contention that the raw images from the 50D are...
Forum: Canon Saturday 1st August 2009, 21:35
Replies: 49
Views: 6,457
Posted By stephenB
I wouldn't call ISO 400 raised! In fact with the...

I wouldn't call ISO 400 raised! In fact with the 350D and 40D it was my standard setting given the usually less than brilliant light levels in the UK. With the 40D and even the 350D, ISO 800 often...
Forum: Canon Saturday 1st August 2009, 17:41
Replies: 49
Views: 6,457
Posted By stephenB
Got almost my first field shots with the 50D...

Got almost my first field shots with the 50D today at Farmoor - my local reservoir, despite the dismal conditions. There was a distant Y L Gull, and an underexposed ISO400 raw pic provides an...
Forum: Canon Saturday 1st August 2009, 09:20
Replies: 49
Views: 6,457
Posted By stephenB
Tim It seems a shame to remove all your...

Tim

It seems a shame to remove all your interesting contributions Tim. Nothing wrong in my view to having several contrasting views expressed in one thread. Isnt a heathly debate what these forums...
Forum: Canon Friday 31st July 2009, 19:54
Replies: 49
Views: 6,457
Posted By stephenB
I had no idea that this post would stir up quite...

I had no idea that this post would stir up quite such strong emotions!

All I was trying to point out was that my quantitative and fully objective measurements appeared to show that the noise levels...
Forum: Canon Friday 31st July 2009, 12:03
Replies: 49
Views: 6,457
Posted By stephenB
Blimey! I seem to have hit a few nerves...

Blimey! I seem to have hit a few nerves here!

This isnt quite what I intended when I posted these quantitative results.

I would however observe that I'm not in full agreement with Tim's views on...
Forum: Canon Thursday 30th July 2009, 20:26
Replies: 49
Views: 6,457
Posted By stephenB
Tim You make some interesting points about like...

Tim

You make some interesting points about like for like areas, but with more pixels on a 50D there is a natural temptation to hope that you can push more, i.e. crop more severly to get a better...
Forum: Canon Thursday 30th July 2009, 19:35
Replies: 49
Views: 6,457
Posted By stephenB
Thats pretty conclusive! I wonder if the...

Thats pretty conclusive! I wonder if the difference between your images and my graphs can be due to your showing pictures at the same size, not on a constant pixel scale? If there are more pixels on...
Forum: Canon Thursday 30th July 2009, 19:09
Replies: 49
Views: 6,457
Posted By stephenB
Yes Tim they look pretty good and I'd agree there...

Yes Tim they look pretty good and I'd agree there isnt a big difference between the 40D and 50D in noise terms on your images.

Just to be sure, can you confirm you have set CF II -2 to a value of 3...
Forum: Canon Thursday 30th July 2009, 18:44
Replies: 49
Views: 6,457
Posted By stephenB
I am sure that with appropriate post processing...

I am sure that with appropriate post processing using NeatImage noisy images can be made to look quite acceptable. That wasnt quite the point of my original post! That was to try to make a like for...
Forum: Canon Wednesday 29th July 2009, 18:51
Replies: 49
Views: 6,457
Posted By stephenB
Quantitative image noise level measurements: Is the 50D really this bad?

I've recently acquired a 50D as a replacement for my 40D, as part of a complicated insurance claim/saga (another story!)

I have now made some initial quantitative measurements of the noise levels on...
Forum: Vacational Trip Reports Sunday 29th March 2009, 17:43
Replies: 3
Views: 790
Posted By stephenB
I do seem to be a bit unlucky with the scottish...

I do seem to be a bit unlucky with the scottish weather! As you say, maybe better luck next time, though I've no idea at the moment when that will be.
Forum: Vacational Trip Reports Sunday 29th March 2009, 15:20
Replies: 3
Views: 790
Posted By stephenB
Day in Aberdeenshire

I have just got round to writing up a days birding and photography in Aberdeenshire, from February.

Despite poor weather, I saw some reasonable birds, including plenty of Geese and a good flock of...
Forum: Vacational Trip Reports Tuesday 10th March 2009, 19:39
Replies: 1
Views: 802
Posted By stephenB
Long weekend in the Camargue Feb/Mar 2009

We have just returned from a successful 3-day visit to the Camargue area of France - the first time for us in winter.

The specialities of the region performed reasonably well for us, with the...
Forum: Canon Monday 27th October 2008, 18:15
Replies: 13
Views: 2,592
Posted By stephenB
Thanks to all those who have provided input to...

Thanks to all those who have provided input to this thread. I think I'll go with the consensus, and save my money for other things, by not going for a x2 converter, or even a second x1.4!
Forum: Canon Tuesday 21st October 2008, 19:03
Replies: 13
Views: 2,592
Posted By stephenB
Mike Have you considered using extension tubes...

Mike

Have you considered using extension tubes to get closer than 3.5m? These are relatively cheap, and contain no glass and hence result in no loss of image quality. I use them regularly for...
Forum: Canon Monday 20th October 2008, 18:13
Replies: 13
Views: 2,592
Posted By stephenB
Thanks Roy for the explanation. I might well...

Thanks Roy for the explanation. I might well investigate that option.

I note from above that loss of quality with TC's is a recurring theme. With my 400f4 DO, I have already tried a x1.4TC and am...
Showing results 1 to 25 of 66
 


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