The coating on the Fuji lenses isn't what affects the image circle, it just happened to also change in the new design along with tweaks to the shape of the glass curves, which is why the coverage is different for the same focal length and aperture lens.

Thanks so much for doing these videos Matt...learning a lot. I thought I understood image circle but there’s a lot more to it.

Thanks for making this very clear. I need to figure out the image circle for a vintage lens that came with my B&J 4x5 press camera. It’s a Voigtlander Heliar 135mm.

Awesome content Mat! Finally picked up my first large format (4X5) camera this week. So much more to learn now so thanks for sharing!

matt good video, but one more point, this image circle concept is why the DSLR'S dump resolution (Dx mode) automatically when a crop lens is attached to a full frame camera, as it would vignette otherwise, and you would have to crop anyway!

Thank you for taking the time and trouble for making and posting this and you other videos. Thoroughly enjoyed it even if I can't afford that bloody lens. Loved the Sinar though.

Well done. Good takeaway for the effective IC being aperture and focus dependent.

Large format hair

Came for the photography, stayed for the Hair lol. Oh yeah, the Hair made me subscribe.

great to see the sinar out in the wild 🙂 you don't take it out often enough, on the channel, the tachihara gets more of the limelight, should do a studio session with Tariq and this P2 see how macro you can go, as the flash in that studio would mean no problems with light loss, so perfect for this test.

Good to see you stepping more in depth now. A Sinar P2 must be perfect for the current times 🙂

One of the best channels i have browsed for large format photography. Would like to understand swing and tilt movements as I am just going to buy a Sinar soon.

Loving these videos! Very useful. Reminds me that I need to get out and shoot more large format. Also reminds me that I need to get my hair cut!

Thank you!

I like your content, but you really must consider doing this one over. 1/4 wave anti-reflection coatings do not have any effect, direct or indirect on lens geometry, or image circle. The image circle (which is another way of describing the lens's angle of view, just as the focal length is another way of describing its magnification) is determined by the design of the lens, and its focal length. A longer focal length of the same design will have a larger image circle, but two lenses of the same design will have the same image circle, which is in no way related to the coating (which is there to control reflections, not geometry). Most more modern view camera lenses have larger image circles than their predecessors, but this is because they have been redesigned, and have different optical formulae. Coatings enter into this only by the fact that better AR coatings allow lens designers to use more lens elements, and improve performance, without suffering from as much loss from reflections.

nice video, but with lens selection for large format, you mainly concentrate on mono-rail cameras, could you do a video on how one would choose lenses, etc. for field cameras, like linhof Technikas, shen hao, ebony, Canham, intrepid, and for different formats, like 4x5" and 5x7" ( 9x12 cm and 13x18 cm respectively)- the imperial camera designation takes either, all that is specific, is the right film for the holders, eg. a 5x7" is technically 12.7 x 17.7 or near enough, as the difference is only in the non-image area, ie this extra is only a wider guide track for the film, BUT you put a 5x7" sheet in this holder, the film won't lie flat in the holder, it "puckers" as there is 2mm or so more film trying to fit inside the holder!

Another great video, Mat! I don't think I fully appreciated a deeper understanding of image circle until this video. Is there a rule of thumb for image circle:format ratio that's considered good for landscapes? Have you noticed a difference in the quality of your images between the single vs multi-coated lenses? The pro/con weighing of better edge-to-edge sharpness vs. smaller image circle almost feels overly simplistic - I feel like I'm missing something. Provided that image sharpness is better as you get closer to the center of the frame and less sharp as you move to the edges, wouldn't you still see some benefit to the single-coated lens because the larger image circle means you don't have to get as close to the outer edges of the image circle? Maybe this is an incorrect understanding but the way I am trying to understand is that it's like you're putting a full frame lens with softer edges on a crop sensor camera and comparing it with a modern lens meant for sharp edges. I would think because you only need a smaller portion of the image circle on the full frame lens, the weaknesses of the outer edges wouldn't really be felt on the crop sensor. Am I way off base?

You should compare image circles or something like a 150mm press lens and a wide 150mm studio lens

Hi mat this is Ainsley from Trinidad can you do a video on using a 6x17 film back on a 4x5 view camera, and what is the best lens that can be used on it.

Thank you very much for all the good input! I have this question That i cant really find an answer to.. if i would have a fujinon w 210 mm f5.6 lense, which is supposed to have an image circle of about 350mm at f22,- at which distance between lense and film plane does this imagecircle appear? From physic classes I remember the focal length to be the distance between the lenses plane and the focal point, as the point where all light is condensed into one point. I have the feeling that this definition does not apply to camera theory? Do I have to place the film roughly at the focal length? I want to build my own large format camera to shoot some paper negs. Thank you for any help..

What is the head that your Sinar is mounted on? It doesn’t look like any of the ones mentioned in your video on the subject.

Hi Matt. Thanks for the channel. I'm a new film and large format (4x5) and hoping you can point me in a direction to understand lens descriptions. I see lenses listed as Wollensak 12" Variable, or 7 1/2" 190mm f4.5 or 8 3/4 f4 or similar. I"m trying to understand what that means and how it might relate to my 4x5 . Thanks for your suggestion.

Yup, nice lens also nice price in eBay UK, US $6,899

Mat - as I understand it - the "spare" image circle available for movements can be a big deal with specific lenses i.e. if you stretch a lens to a slightly too big format. Is this really only a problem for bigger LF cameras or is it something you always need to consider when you're buying a lens for say a 4x5. In other words do 4x5 shooters normally have it easy and rarely bother about image circle?

strange question - if I have to determine the image circle of an unusual lens, like a projector or enlarger lens, what should I do?

there's no lens with an image circle big enough to capture all that hair !!!!! 🤣

Do i only need to worry about image circles if im using the camera movements?

Hey Matt! Hope you are doing well dude! Nice to see your videos! I haven't been able to do much LF in the last two years but hope to get back into it!

so in theory i am using medium format lenses with an adaptor on my digital camera...if i used a 6x7 lens i could use more of the digital sensor

That was the best description of how movements are accessing more of the image circle. I have the classic press camera lens, Raptar 135mm f4.7 on a 4x5 monorail and am interested in portraits of family members at the moment. Any affordable suggestions? I was looking at an old symmar 210 that is also a 370mm. I don't really get how these convertible lenses work. Also, what happens if your shutter has f 5.6 and your lens is f8. Does everything below f8 not matter?

you're not going to get clipped corners using lower f numbers. the larger the aperture, the larger but more unevenly illuminated your image circle gets. stopped down your image gets more even but the outer edges of the image circle get clipped.

May be? ..But looks what it's done to his hair.

lens coatings have ZERO effect on image circle or loss of sharpness towards the edges, and newer lenses tend to have better coverage as lens designs and manufacturing methods have improved.