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Lenstip has reviewed the Sigma S 500 mm f/5.6 DG DN OS. It is optically great, being virtually diffraction limited. What is additionally interesting is that this very careful and reliable site explains how they coped with the problems from a long focal length. I suspect certain other sites are...

I had intended to use the RF 100-500mm for photoing insects close up because it focusses so much closer than the RF 200-800mm and it has much better magnification. RF 200-800mm mfd is at 800mm is a very long 3.2m, and the highest magnification is 0.25x at 200mm with an mfd of 0.8m. The RF...

https://www.bbc.co.uk/news/uk-68534359

I have a business trip to Seattle mid-August and will take the opportunity for a birding holiday for both of us afterwards. Any advice on places to visit for birds and nature would be much appreciated.

I have now taken a couple of thousand images with charts and birds in the wild to test the RF 200-800mm on the R5 and some on the R7. This was both from sheer interest and for me to decide whether to keep the lens and if so which lens to use in various circumstances. Much has been posted in two...

I have been testing the RF 200-800mm with bird shots to see whether the 500-800mm range justifies the extra weight and bulk over the RF 100-500mm with the R5. @docsmith has provided some good exchanges in other threads and we seem to be in agreement with how focal length affects IQ and...

I have been asked to post my tests comparing the RF 200-800mm vs RF 100-500mm. Unfortunately, I had only a few minutes with it at the local dealers and couldn't put it through my usual extensive tests but I do have some useful results on the relative resolution on the R5 and R7 vs the RF...

I have been invited to Istanbul at the beginning of March and want to stay on for some days for birding. Any information, advice or a recommended birding guide would be most welcome. I know there is migration towards the end of the month but my experience of that elsewhere is that the birds are...

How many preordered I wonder?

According to the Canon MTF charts the RF 800mm f/11 and RF 100-500mm + 1.4xTC @ 700mm are nearly identical. This means the 800mm should outresolve the 700mm because of the extra 100mm. I find this with my copies. Others have reported the opposite. It could be that I have a poorer copy of the...

Double Rainbow this afternoon in a short break between showers.

Nikon has announced the latest PF lens. Weighs the same as the 500mm f/5.6 PF at 1.47 kg without hood. Its minimum focus distance is longer at 4m. 95mm thread. It will be a winner for Nikon among birders and wild life photographers. Not cheap at £5000/$4800. Pity it doesn’t have the 3m mfd of...

https://www.birdpoty.com/bpoty-2023-winners Some rather good images in all categories.

Just how much extra resolution do you get using a telephoto on the 32 Mpx APS-C vs the 45 Mpx full frame R5? The answer is not 1.6x, the crop factor. The upper limit will be the ratio of the lengths of the pixels, in this case 4.39/3.2, = 1.37. But it will be lowered by various factors...

A bit of geek from me about the RF 100-400mm. I do a lot of semi-macro photographing of dragonflies and butterflies with it at 1 to 3m (3-10') and wanted to know what the magnification is at those distances and for amusement how the focal length drops as you get closer to the target. Here is a...

Just got a message from Adobe to try PS Beta with Generative Fill, which uses AI. So, I tried and within 2 or 3 minutes removed a Reed Bunting from a photo and prompted the program to place a Humming Bird there. I can now sell all my gear and stop chasing rare birds.

ePhotozine has just reviewed the Leica 100-400mm https://www.ephotozine.com/article/leica-vario-elmar-sl-100-400mm-f-5-6-3-lens-review-36495 and I thought it would be interesting to compare it with their review of the RF 100-400mm...

It has been proposed that less than 10% use CRAW in the recent cameras that have this facility. So, what is the reality?

https://www.bbc.co.uk/news/entertainment-arts-65296763 Do we need cameras any more?

Opticallimits is an excellent review site, making careful assessments based on measurement rather than histrionics. It seems it's a struggle to keep going financially, and so they now have a deal with Patreon whereby you pay a $ a month to become a patron to get earlier access to their reviews...