Fotodiox Green Screen
It’s not a like-for-like substitute for a Leica M10-R, of course, and there are compromises. But most importantly, it checks all the right boxes in what you want in a very compact camera. PCMag is obsessed with culture and tech, offering smart, spirited coverage of the products and innovations that shape our connected lives and the digital trends that keep us talking. It focuses fast, with stabilization and tracking that make it a viable tool for photographing action. It doesn’t have the cobbled-together feel and bulk of a modular SLR system, and costs much less than your average sedan, while still offering a 100MP sensor. If you do opt for JPG capture, be aware that in-camera noise reduction does a disservice to photos shot above ISO 1600.
For swing, you add the same amount of shims to both left or right side screws. If you have corrected for both swing and tilt, there will always be one screw that gets shims from both corrections. Then run Photoshop’s Find Edges (or GIMP’s Edge Detect Sobel filter) and desaturate the result. The filter picks out in-focus edges with dark outlines, allowing you to see field curvature with ease. From this, you can also observe any asymmetry/de-centering of the lens, detect astigmatism, resolution falloff and observe for swing and tilt .
The Sony design doesn’t seem to have the holding springs like the GFX 100 does to prevent flop. I’ve never taken apart a Sony IBIS assembly so I’m not 100% sure, but it’s not visible in any teardown pictures I’ve studied. For what it’s worth, I was not able to notice this flopping in my own tests so far, but I’ll just highlight it in case.
The camera chews through batteries too, so I recommend buying some spares and a power bank for recharging in the field. It’s bright, with quick access to adjust its backlight available via the Q menu screen. And with 2.36 million dots of resolution, it’s sharper than similar displays on other cameras, helpful for manual focus and image playback. You may struggle a bit if you’re thinking about adding the GFX to your kit, but don’t want to give up your 50S or 50R. The previous entries in the GF family use physical dials, a different control philosophy than what we see at work here with the GFX100.
Fotodiox Pro Collapsible Background Kit
The other unmarked top button sits ahead of the display toggle. It’s slightly larger, and flatter, so you can feel it out by touch. It toggles the shooting mode by default, via the standard P, A, S, and M options. You will need to set your on-lens aperture control ring to its A position to access Shutter Priority in the camera, though. A long press of the control button locks your shutter speed so it can’t be changed, with a second long press disengaging the lock. Display options include an information screen that shows exposure data, the shooting mode, white balance, file format, and the film emulation mode, along with number of shots left on your memory card and battery life.
This is a Canon EF70-200mm f/2.8 L IS II USM @ 105mm and f/2.8. The amount of swing shown here is about 200 microns and can wreck a picture even after stopping down a lot. The B&W illustration is what you get when running Photoshop’s Find Edges filter on the top photo, desaturating and then enhancing the contrast a lot.
My situation and local availability prevented me from doing the same. This is a necessary process to objectively pick the best examples of each lens we would like to have. Every lens we have looked at is usually more than a little different from each other. I’ve not yet encountered a single design where I could not tell apart the optical behaviour of individual copies with the right kind of test subject.
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I also positioned a stainless steel metre ruler where the focus plane will fall, for additional subject matter to read off from. I used all possible cues together with Photoshop’s Find Edges filter to assist in determining the plane of focus. The camera’s sensor was positioned directly above the zero-point on the tape measure, guided by a weighted piece of twine. The centre of the sensor measured 135cm off the ground and the diagonal distance to the tape measure was calculated and used, rather than merely reading off the ground distance. Here’s a handy spreadsheet so you can plug in the two focus distances for a flipped-camera pair as you determined in step #4 and the focal length of the lens you used, which will give you two lens extension amounts. So hang on, this is not yet the true sensor swing and/or tilt amount.
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These look OK at Instagram sizes but upon enlargement, betray many quality issues. The brightest stars are usually overexposed and clipped, appearing harsh. Meanwhile, the entire image is grainy due to high levels of noise, which is worse in the light-starved image corners from strong lens vignetting. Finally, the pixel resolution is never quite enough for a large print. I can sometimes notice these issues even at Instagram sizes. The GFX100’s autofocus is, bar none, the best available on any medium format camera.
The sensor mounting screws likely use a smaller thread pitch for finer control. So it is possible to make very fine adjustments to the screws, finer than the intervals that shims come in. How did we arrive at something like 10 microns as our requirement, you might ask? An f/2.8 aperture gives a depth of focus of 24 microns for a CoC of 4 microns (close to the a7R II’s pixel pitch), which does not vary by focal length. Any tilt less than what is covered by the depth of focus should not matter.
It may well be that some units will be more floppy than others. The cheaper grade types are typically still under a micron of perfectly round and they seem inexpensive after a cursory check online, so cost is not likely a deterrent factor. Silicon Nitride is very hard-wearing and has high thermal stability.
Green Screen Gingham Checks
You search for the Misumi shims by part number using their system, which I will explain. So don’t assume spring-tensioned sensors are always perfectly aligned, even if they can be in theory. Read inspiring stories on other active agers and ﬁnd information on health, ﬁnance & products to help seniors live healthier and happier. “Take the analogy of road traffic as an example – consider brain regions as destinations, while the connections between brain regions are roads. When a road system is better organised, the movement of vehicles and passengers is more efficient and uses less resources. Similarly, when the connections between brain regions are more structured, information processing can be performed more efficiently,” explained Asst Prof Feng.
Beware the wide range of temperatures one may have to operate in. Consequently, due to expansion or contraction, the infinity stop won’t necessarily be infinity. The recent development of many fine wide-aperture lenses, probably accelerated by the extraordinary progress in high-resolution image sensors, was encouraging for what we wanted. Not so long ago, a lens that gave you sharp corners at f/11 to f/16 was considered decent, and sharp by f/8 was very good indeed.
You would never dare to dream of one that is great at f/5.6, let alone f/2.8. It would have been too bulky and too expensive to be practical, and they simply didn’t exist anyway. But now, several designs appear to reach their peak sharpness on-axis at f/2.8 and in the corners by f/4 to f/5.6 without breaking the bank or your back.
Green Screen Honeycomb Pattern
I say ‘appears’ because we did not have enough time to make sufficient measurements to properly verify this. I was told by the Keyence representative that the silicon wafers and CMOS sensors he has measured are all warped. He thinks that the warping usually doesn’t exceed 10 microns for camera sensors, but he didn’t have actual data on that.
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Focus is performed using the image sensor, using a hybrid system that incorporates both the phase and contrast detection points. Focus is available over most of the sensor’s area, with only the very outer edges and a narrow strip at the top and bottom left without coverage. Face and eye detection are available, so you can more reliably nail focus on your subject’s eyes, even when working with a shallow depth of field. My Sony CMOS sensor at the bayer CFA surface appears to be warped.
This would be all fine assuming the lens’ field curvature is flat rather than curved, which very few are. So requiring that the entire system is straight to under 10 microns is better assurance. In addition, my experience is I can make out a focus tilt of 10 microns with a very sharp lens—depth of field does not mean everything is equally sharp. In practice, I try to adjust my lenses to under 5 microns of perfect relative to the camera. Zoom lenses tend to exhibit more tilt and swing issues than primes on average.
- We did wonder for a time if IBIS systems introduce enough variation to render our efforts meaningless.
- In addition, my experience is I can make out a focus tilt of 10 microns with a very sharp lens—depth of field does not mean everything is equally sharp.
- If I look between the bayonets using a window or something bright like my computer display as the background, I see that there is a gap between the bayonets on one side which changes.
- If you find yourself caught in iterative adjustments, know that it’s normal.
- You might think field curvature has increased by stopping down, but in fact it hasn’t.
- We need to measure the combined thickness of the Novoflex plus the rotating part of the Mirex.
The cost of these sensors are pretty substantial compared to the Mirex adapter, though they are only about 5% of the cost of a $225,000 ZYGO Verifire MST laser interferometer. Such a table will easily exceed the cost of the confocal white light sensor. It’s not something the average photographer would bother with. For a 150mm lens focused at 9 meters, a 1cm focus shift represents 2.9 microns shift at the sensor. But I find can’t make out the line markings well enough at 9 metres.
A presence of a fully articulating screen also means that selfies are on the menu (we’re not judging). Someone forgot to tell Fujifilm that medium format cameras are supposed to be slow. Oh, and they’re supposed to cost a bundle, somewhere between a Volkswagen and a Mercedes, depending on how much resolution you want. With file sizes like these, it’s not hard to fill up a memory card. I always shoot Raw+JPG when testing cameras, which made it much too easy to fill a 64GB card during a morning outing to the local zoo. You may want to budget for a big external RAID drive along with your camera.
After some estimates of the various angles of view of potential compositions and a lot of reading of Roger Clark’s articles, I arrived at a similar conclusion. I initially preferred the Canon EF 35mm f/1.4L II USM over the Sigma in my own tests. Alas, after evaluating multiple copies and purchasing two, I never found one that was sufficiently optically centred.