Confused?
Derek Smith • 15 July 2020
The Circle of Confusion

Confused?
We all “know” that a blurred background behind a subject is hard to obtain with a crop sensor camera, and that macro photography is easier with a micro four third sensor camera because of the “increased” depth of field. Well actually both of these statements are “fake news” often touted on YouTube, or in photographic articles.
Professor Bob Newman wrote on this topic in his Amateur Photography article 11th July 2020 entitled “The Great Leveller”.
In camera optics, a circle of confusion is an optical spot caused by a cone of light rays not coming to a perfect focus (also known as the disk of confusion, circle of indistinctness, blur circle, or blur spot). In other words, Depth of Field.
Professor Newman asserts:
“For macro photography, provided we keep the focus distance, the angle of view and aperture the same, and choose the same disc of confusion, then we’ll get the same results whatever the sensor size”
This appears to be borne out by the Wikipedia article on this subject, with the Circle of Confusion diameter limit based on d/1500 of 0.015mm (micro four thirds) to 0.029mm (full frame), and I challenge anyone to see that difference on an 8x10 print!!
I find macro photography as challenging with my Olympus micro four thirds camera, as I did with my full frame Sony A7. As an example, the Depth of Field for a 120mm lens, at f/5.6 = 0.13m on the Sony A7, and with the Olympus 60mm macro lens (2x crop factor = 120mm) at f/2.8 (2x crop factor = f/5.6) my Depth of Field = 0.14m - not much of an advantage there then!!
In conclusion sensor size should not be the determining factor when choosing a camera. Ergonomics, controls, how the camera “feels” in the hand, size, weight, and lens availability, are perhaps far more important in choosing a camera.
Always remember the image is everything, what camera the image was taken on is immaterial. I recall one of our members producing stunning high-quality images in competitions with his diminutive Sony A5100 APS-C camera.
The above photo was taken on a Nokia Lumia 635 Windows phone and was placed 1st in a recent PDI competition – the image is everything.
Article, and photo: Derek Smith
We all “know” that a blurred background behind a subject is hard to obtain with a crop sensor camera, and that macro photography is easier with a micro four third sensor camera because of the “increased” depth of field. Well actually both of these statements are “fake news” often touted on YouTube, or in photographic articles.
Professor Bob Newman wrote on this topic in his Amateur Photography article 11th July 2020 entitled “The Great Leveller”.
In camera optics, a circle of confusion is an optical spot caused by a cone of light rays not coming to a perfect focus (also known as the disk of confusion, circle of indistinctness, blur circle, or blur spot). In other words, Depth of Field.
Professor Newman asserts:
“For macro photography, provided we keep the focus distance, the angle of view and aperture the same, and choose the same disc of confusion, then we’ll get the same results whatever the sensor size”
This appears to be borne out by the Wikipedia article on this subject, with the Circle of Confusion diameter limit based on d/1500 of 0.015mm (micro four thirds) to 0.029mm (full frame), and I challenge anyone to see that difference on an 8x10 print!!
I find macro photography as challenging with my Olympus micro four thirds camera, as I did with my full frame Sony A7. As an example, the Depth of Field for a 120mm lens, at f/5.6 = 0.13m on the Sony A7, and with the Olympus 60mm macro lens (2x crop factor = 120mm) at f/2.8 (2x crop factor = f/5.6) my Depth of Field = 0.14m - not much of an advantage there then!!
In conclusion sensor size should not be the determining factor when choosing a camera. Ergonomics, controls, how the camera “feels” in the hand, size, weight, and lens availability, are perhaps far more important in choosing a camera.
Always remember the image is everything, what camera the image was taken on is immaterial. I recall one of our members producing stunning high-quality images in competitions with his diminutive Sony A5100 APS-C camera.
The above photo was taken on a Nokia Lumia 635 Windows phone and was placed 1st in a recent PDI competition – the image is everything.
Article, and photo: Derek Smith
Louth Photographic Society

Good Morning All Last week at the club we held a local PDI competition, Wildflowers and Open, there were some very good entries and especially well done to Keith Rossington who was placed first in both categories. The results are on our website. Thank you to Dave Turner who judged the Open, the first time he had judged live, and he did an excellent job with plenty of helpful comments and some good advice as regards processing our images. That was the last meeting at Church House until September as we now begin our summer break. There is however an LPA Battle, third round at Cleethorpes camera club next Tuesday, It is at 7.30 in their clubroom which is between 49 and 51 Reynolds Street DN35 7TU. Parking is best by the tennis courts. Regards Graham

Last night we held our last competition before our summer break. The PDI (Projected Digital Image) competition had the categories of "Local Wildflowers", and "Open". As this was a members competition, Dave Turner judged the "Open" category, this was his first time judging a competition, he had previewed the images, and made notes, and he gave some excellent critique, which will help members when submitting images in future competitions. After the break, Graham Harrison judged the "Local Wildflowers", a couple of the submitted entries were excellent, but unfortunately did not meet the category criteria so lost some points, flowers always make a good subject for a competition, and Graham had quite a task in judging the images. It was a superb evening with some amazing images, Keith Rossington took first place in both categories, the images he submitted show how much time, and effort he takes with his photography, well done Keith.

Good Morning All Last Sunday I went to the Armed forces day at Cleethorpes, there were not so many people about as I think most wanted to see the Red Arrows on Saturday. There was an excellent display from a group of first world war re-enactors who were mounted and in the uniform of the Lancers as well as a limited air display the highlight been the Spitfire. Last week was also the run for life in Louth, Sam from Colorgrafix did the run in memory of Paul Malley and raising money for cancer research. Sam asked the club for sponsorship so we sent her a donation from us all. Last Friday 21 members and partners enjoyed a meal at the Royal Oak, Cawthorpe, it was good to be able to socialise with each other with a few drinks and a very good meal. I hope everyone had a great night. This week, Wednesday 9th July, we are holding a PDI (Projected Digital Image) competition, with the categories of "Local Flowers in Their Environment (25 miles limit)" and "Open". I am going to judge the Flowers with Dave Turner judging the Open. Regards Graham

Most people are aware of “writers block”, where a writer sits staring at a blank page, and can’t think of a story to write, well photographers suffer from a similar affliction, with a camera sitting on a shelf, and we can’t think of anything to photograph. I believe that change in one way or another can invigorate our photographic creativity, one of our members renowned for his seascapes, has begun taking photos of birdlife, creating some stunning images. My favourite photographic genre has been in fashion and portraiture for the past 6 years, but I’ve lost the “joy” in the genre, so now I want to take more landscape, and macro photography, varying my style. I have just changed my camera system, and now I’m excited to try out the new lenses and watching endless YouTube videos to learn about the new camera system, as well as getting out, and trying the new techniques, these are some of the images from my new camera system. Another method of invigorating your photography is to start a project, think of a subject, and build a portfolio of images, watching how your photography improves as you take each image over time. Joining a camera club is another way to invigorate our photography. Many of our members have stated that their photography has improved since joining, being inspired by the talks, workshops, and regular competitions. The competitions are important both from a learning perspective, but also from the challenges in the subject matter. Recently I was dashing around trying to photograph “Wildflowers in the Environment” for our next competition, a lot of the roadside verges had been mowed reducing the wildflowers locally. Next, I tried some churchyards, there was some “Ladies Bedstraw” flowers in Scrivelsby churchyard, but it didn’t make for a convincing photo, I found some wildflowers along a footpath that did work. I did find another convincing photo in a local church yard, but still I had only two out of three photographs, and the deadline for competition entry submission was fast approaching. Driving out of Horncastle I spotted an ideal wildflower candidate, so quickly turning the car around, parking on the verge, and laying flat on the ground I was able to take one of the best images of the three, and with a lens that I wouldn’t normally associate with this style of photography. In conclusion, dust off that camera, take some photographs, and rediscover the simple joy of photography.

We had a really good turn out for the visit to Rimac last night and the weather was fantastic for taking wildlife photographs. There was plenty to photograph from moths and butterflies to many different birds, there were also plenty of wildflowers as well. I think we all took plenty of photographs so the competitions should have plenty of entries this year. We spent just over two hours photographing and walking round then some of us visited the Prussian Queen in Saltfleetby, where we were made to feel welcome and quenched our thirsts.

Paul Malley, a gentle, genial, giant of a man sadly passed away recently after a long illness. Paul had been a longtime member of the Louth Photographic Society, and had served in several roles, Treasurer at one time, and latterly as a stalwart active member on the Committee. Always ready with helpful knowledge, and advice, Paul was calm in a crisis, and insightful, able to understand both sides of a discussion, and suggest a compromise. An outstanding photographer, dedicated to his craft, he produced some excellent images, some of which are shared here. Rest in peace my friend, you will be much missed by Pam, family, friends, and members of the Louth Photographic Society.

Good Morning All Last week at the club we held our monthly print competition, there was a good entry of just over 40 prints and of a very good standard. Tony Gaskins won the subject, Britain's Coastline with an excellent photograph of Whitby and Dave Tuner was 1st in the Open with an excellent misty morning photograph at Buttermere. Thank you to all that entered, and all the results are on our website. This week, Wednesday 25th June, we are going to Rimac near Saltfleet, I have heard there is quite a bit of wildlife there at the moment, let's hope we are lucky. If we meet in the car park at 6.30pm and set of as a group though we usually get stretched out as we go. I have attached a map, but if you are on a corner and there is a track going towards the sea at the area shown on the map you should be ok. Regards Graham

Our print competition with the categories of “Britain's Coastline”, and “Open” was held last night. Gail Wrigg, the LPA President, was the judge for the evening, and there were some stunning prints submitted into the competition to review. The images were judged fairly, majoring on the technical imperfections of the images, depth of focus, composition, elements within an image that could have been removed, and improved cropping of an image. Gail always connects with the audience with her critique of the submitted competition entries. It's surprising how the print medium looks, and feels so different from an image viewed on a screen, just very alive, and tactile. The competition results have been updated on the Competition page of our website.

Good Morning All, I visited Welton-Le-Wold nature reserve the other evening, a bit like a small Red Hill, there were a lot more wildflowers there than Red Hill but again not many insects, it may be better in the daytime? It is only about two miles from Louth as well. Last week was the LPA battle at Scunthorpe, only Dave Turner went taking our prints with him, not a good result for Louth, 1st Grimsby 258, 2nd Scunthorpe 245 and 3rd Louth 236, quite a difference from the first round but that's LPA battles. The next round is at Cleethorpes, it would be good if a few more members could attend. It will soon be our annual dinner at the Splash, any more deposits this week please and menu choices by midnight Wednesday please, otherwise you may go hungry. This week, Wednesday 18th June, we hold our monthly print competition, with the categories of “Britain's Coastline” and “Open” there has been a good entry so should be a good night. Regards Graham

Good Morning All Last week we visited Red Hill nature reserve, a very good turnout, but the wildlife didn't seem to know we were going, it's quite worrying though the lack of any butterflies or any other insects of any sorts. Hopefully we all got some photographs before we visited the Three horseshoes at Goulceby. I did photograph an unusual caterpillar but couldn't manage to identify it? This week we are away in the LPA Battles at Scunthorpe, for anyone planning to attend it is at the Pavilion, Bramley Crescent, Bottesford DN16 35N this Wednesday 11th at 7.30pm. I don't think I will make it due to work but hopefully some members will attend. There will be no meeting at Louth this week as members will be a way at Scunthorpe. The following week, Wednesday 18th June, we are holding the monthly print competition, if you can email your titles to Dave Turner by midnight Wednesday 11th if you have not already and bring your prints in on the night by 7 pm as no one is there to collect them this week. There are still a few deposits for the meal to come in yet, but in two week's time will be ok. If you can send your menu choices to me if you are attending by midnight 0n the 18th June please, as they need typing out and sending to the Splash two weeks in advance. Well, I think that's all, Regards Graham