Gregory Irwin

I couldn’t agree more. I have only one email account and I’m not on Twitter! In fact, I’m not on any social media. I refuse! I have only one phone number. Like I said in an earlier, separate post on this site, I keep it stupid simple! G

There’s a motto within my camera team that we believe in and is stated several times a day: “Keep it stupid simple!“ I believe that applies here. G

Please don’t sugar coat it Dom! Tell us what you really think! ? G

It’s not! The film plane/sensor is the right position for focus collimation. The whole concept of the entrance pupil is more related to the calculation of F-stops and exposure. It’s an actual virtual image magnified when viewed through the front element of the lens. This is as opposed to the diminished size of the aperture when viewing through the rear element of the lens, known as the exit pupil. There’s a lot more to this and this can be researched from here on so you can go as deep into it as you desire. I’m sure it’s a bit confusing. G

I respect Jay’s article but I do believe he’s a bit misleading with it. With regards to the entrance pupil of a lens, technically he is correct. Where he goes astray is in two places. Firstly, it is absolutely impractical to measure focus from the entrance pupil of different lens designs since lenses are commonly collimated to the film plane/sensor. This especially come into play where different camera manufacturers have different flange depth measurements to the film plane. We need a consistent standard here and not a moving target to complicate further a complicated practice. Secondly, where Depth of Field is referenced, he should be talking about Depth of FOCUS. There is a big difference between the two. Depth of Field refers to the range of focus IN FRONT of the lens where Depth of Focus measures the tolerance of focus BEHIND the lens. When you look at the rear element assembly from the lens’ flange to the tip of the rear element glass, the noticeable difference is how a wide lens’ rear element is a narrow torpedo shape that extends much further away from the lens flange. Longer lenses sport a rear element that is a much wider in diameter rear glass element and is much stubbier in length. The wide lens rear element measures much closer to the film plane/sensor than the longer lens’ equivalent thus making the wide lens’ Depth of Focus much more critical for the lens’ ability to achieve proper focus. Long lenses have much more forgiving Depth of Focus while having much less forgiving Depth of Field. The two physical properties are polar opposite of each other. If the Depth of Focus is off, the lens will simply not focus anywhere within the lens’ focus range. G

Of course!!! Mitchells do come in strengths of A-E. I should have known since I own two sets! Mitchell Diffusion A is the lightest diffusion in the set. G

Mitchell Diffusion? Don’t know what the A would stand for. G

Farewell maestro. You are a true gentleman. G

From our family to yours, Rosie and I wish y’all a very Happy Easter from stormy Georgia! Stay healthy and happy till this pandemic ends. G

That’s a great story! I love that. It is inspiring cinematography. Connie was one of a kind. I worked with Hanks on a picture called The Green Mile. What a gentleman he is. Enjoy the rest of the movie Justin! G

Tonight’s selection:

Congratulations Uli! That’s wonderful. Enjoy your family during this time. G

Since we are all catching up on our reading, this John Adams bio is outstanding. G

This is crazy. It’s the same here in Atlanta Georgia. Empty streets. I hope everyone stays home, safe, healthy and responsible. My wife volunteered to come out of retirement and go back into service as a Clinical Nurse Specialist in Public Health to aid COVID-19 screenings and testing. She just couldn’t stay on the sidelines. My oldest daughter is a hospital director for a major hospital and is absolutely exhausted trying to keep up with patient needs. So please, let’s all do our part and stay home. This too shall pass. G

Copy that Phil. My apologies. Call anytime. G

Keep them coming! What the hell else do you have to do? ✌️?? G

Did you think I would post anything else??? ? G

Can’t see your picture Phil! G

I’m feeling well David. Thanks for asking. When my doctor told me it would take an entire year to feel normal again, I thought he was crazy! As it turns out, he’s probably right. But getting stronger everyday!! Hope you and everyone here stays healthy and happy. G

C’mon all! This only works if you participate. Let’s have some fun during this challenging time.

I thought it would be fun to see what our members are doing these days! Post a selfie of where you are and what you’re doing! I’m spending this time at home with the family. This is today in my backyard! G

Everyone is entitled to their opinion... even Tyler! I’m totally kidding you buddy! I really appreciate and enjoy your posts! You are incredibly knowledgeable. G