3 days ago — Focal length definition: the distance from a focal point of a lens or mirror to the corresponding principal plane. Symbol.

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I’ve been doing ok so far whilst building 1:35 armor. However the Takom Hetzer full interior kit has me thinking about more help to see the tiny parts which challenge these 91 year old eyes… I currently use one of those magnifiers thats on a huge boom and can swivel… etc. It doesn’t give me room to work under it when I really really need it. Perhaps a set of magnifying eyeglasses. that focus at 12-14". That’ll let me see and still swing tools around.

After determining the hyperfocal distance, we can point the camera at this distance. The resulting depth of field starts from halfway of the hyperfocal distance ...

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@corsutton Hits the mark here. I have reader magnifier eyeglasses from +2 to +6 that I use for all my modeling. I keep them lined up at the back of my bench and just switch among them when I need more or less magnification. They are much lighter and less claustrophobic than a visor and you can easily look over them to locate tools / read instructions. They let in more light. They’re cheaper than an Optivisor, too. You can order a whole set online from any number of sources or find them at the dollar store.

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2013824 — Eyepiece / Ocular Lens • Magnifies the specimen image • It is where you look through.

The FOV of a camera depends on the focal length of the lens as well as the size of the camera’s image sensor. The relationship between FOV, focal length, and sensor size is complex and can vary depending on the specific camera system.

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Once you get used to wearing them, you’ll never work without them again. First thing I do when I walk into my workroom is to put them on and taking them off is the last thing I do before turning out the lights.

Screenshot_20240223-0830011080×2460 137 KB Have the this pair. $15.95. + shipping. They have bright led lights that are rechargeable. Work great with my reading glasses . interchangeable. Lens.

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However, they’re cheap because their lenses are plastic. My problem with them was that I either wound up scratching them (always in a spot directly in front of my eyes!) or I splashed a drop or two of some solvent-based paint, glue, filler, etc. on them which etched permanent defects.

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Use your experience with the magnification and working distance you get with the cheap ones to select and buy the appropriate ground-glass magnification power lens plate (or plates). You don’t need to buy the entire Optivisor boxed set with all of the available lens plates at once. You can buy them individually, as needed.

I finally pulled the trigger on a pair of genuine Optivisors with a couple of different magnification power lenses. As @flatfour observes, the lenses are glass and so are nearly impervious to scratches and anything I’ve every splashed on them has wiped and cleaned away with no problems.

Having said all of the above, I do have a number of modeling friends who really like the inexpensive drug-store magnified “reading glasses.” These might be worth checking out (especially since you can just walk into the drug store and try them on).

If you wear glasses, then ones like SableLiger recommended are great, as they fit down over your prescription glasses. If you don’t wear prescription glasses then look for “cheaters”, “readers”, whatever you want to call them. The higher the number, the more magnification. I use 1.5 for reading and computer work. I use 3.5 for model working. I think you can get them as high as 6.0, check Amazon.

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But I manage to get by with my 4x Opti Visor, two 1.7x ring-light magnifiers, a 5x hand loupe, a 10x jeweler’s loupe and a 17x geologist’s magnifier, and lots of light.

I have one similar to SableLiger’s; I think mine is an Optivisor or a knock-off. It came with a set of different magnification inserts depending on your needs.

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Comments Section ... 50mm to 85mm are used for portraits since it's approximate to how humans see, so it appears more natural and has a good ...

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I never found myself using the smaller lens on the swivel, and it in fact eventually broke off from being rammed into my work light when leaning forward.

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Focal Length is the distance between the lens and the image sensor when the subject is in focus, usually stated in millimeters (mm).

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