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Vladimir

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Everything posted by Vladimir

  1. except killed rs problem and by 1/3 more data for grading and other purposes. And still smaller than bazooka - i handled both) And even smaller thanks to ken's comment- now its just regular ana with additional front ana glass. So now the sizes are almost equal. And for FF i know some amazing 100/2.8 lens that fits sankor perfectly and thats combo will be very compact and astonishing in terms of IQ. Gonna do proper footage to clear that question ) btw here is my current build, its shorter than previous but with way bigger glasses
  2. Just getting excited about this one: http://www.zyoptics.net/product/zhongyi-lens-turbo-for-sony-e-mount-cameras-sony-nex-a7/ for 120fps a7sII (make it atleast APS-C and one stop of light which is very usable in HFR mode) but turns out "It cannot be used in Sony A7". Whats that mean?.. Only A7 or whole A7xx series? Or they mean that their adapter don't turn FF into MF for A7?) So why payin more? It they both suggest manual calibration)
  3. i'm amazed that it has no big response - fixing rs issue for some cameras and using whole sensor (avoiding silly 1.33x solutions) is awesome. Also amazed that is so quiet here. Really like to see what he made but i'm tired of scrolling that FB group) The only thing close to that ive seen was post on some personal blog about using 4x for really wide panoramas. At that time im already have my first prototype and idea of rotated camera was so obvious that im waiting that it comes to publish somewhere day by day)
  4. Man, i'm freakin love ya! I'd never believed that anamorphic glass gonna work simple as diopter, but since u mentioned it, i tried just now and got 2.2:1 (for 3:2 stills) ratio on 1.5m focus with much better IQ and possibilities than previous build. Ive stacked two identical front glass together and just one rear glass. Its dark outside so ill test infinity tomorow, but for now i got 3.25 coef. at 1.5m focus (i think at infinity its gonna be close to 4x). Here's some stills (sorry for a lack of creativity : ) shot on FF with 85/1.4 wide open (diameter of rear ana glass is resolve it).
  5. Here's screengrab from what i have for rough IQ reference (far from perfect aligning and its 135mm with vignetting). Definitely there is some CA, but i've seen more with just one ana. Ill try add some achromat diopter when get one, maybe that will help. Thank you for info. Here's some other recipe i got while experimenting (trying to get more compact but end up with different result): if u double the amount of front and rear glasses - ull get a really short 2x ana lens that can allow taking lens wider than 50mm on FF.
  6. Of course stack of anamorphics need to be calibrated/aligned very well and can be used only with vari-diopters in front to focus. As i can remember my setup dont suffer from CA much (or maybe i'm not so sensitive to it), but seems i need to present some footage) For a small sensor benefits is to achieve shallower DOF and wider FOV.
  7. Im not sure, its easy to clear that - FB accounts have a persons name thats why that topic was started - to get more setups and results to share) im not thinking - i know, already tested it as i state earlier Here is what my prototype look like: Jupiter37A / D.O.Industries 16F / Rectimascope48 and housing made of 7 step-up rings, 2 empty filters, 2 lens hoods and one inner filters thread to assemble it altogether
  8. So does anyone have 4k external recorded footage to compare it with some 10bit material? And can anyone say whats the max DR that camera can deliver?
  9. im using my sony a7s for two years and havent any issue since the moment of buying. And worth to mention im no carefull user) Sometimes when i needed to charge two batteries at once ive used a usb port to. No problem with that.
  10. since there's a two ana its all about aligning now) u can try, but for proper test need to build some housing, i dont have any machinery skills so i build a housing from bunch of lens hoods and step-up/step-down rings and one clamp to hold sankor inside that housing. Luckily rectima had standard thread on the back and i've used that why not? let it be a new standard ratio) im anyway gonna use it without cropping yep, with small a7s on a back it feels more like telescope)
  11. Since all i got was focus at infinity and macro with some simple diopter, its hard to judge, but it looks like normal 2x. Id like to see proper footage from system like that myself) really want to see) did u saw an "optical coverage" difference between crop of usual 2x and 4x ?) (i made up that termin just now, dont judge me) i think u got what i mean)
  12. Its just i really like wide anamorphic frames and 2x/1.5x combo ends up almost in regular 16:9 ratio. Theres no problem with big front element of taking lens - smaller diameter of ana works like diaphragm. For FF im using Jupiter37A 135mm/3.5 - wonderfull lens with 12 diaphragm blades its vignetting on infinity but when using a close focus its getting more tele (like 150mm), then i fix a infinity with a shorting a flange distance (needed to mod e-mount adapter for that). For APS-C/s35 u can use some 100mm/2.8 - its perfectly fits with sankor. I had that idea in mind for like a half-year, just cant afford proper varidiopter, so i decided to share it as it is. And that idea come from shooting vertically still photos to get some MF look. Later im gonna post my prototype and some other info i get from my experiments. For now im asking someone who had Rangefinder and several ana - pm me and repeat my scheme to get some tests.
  13. I really like to shoot anamorphic and i spend a lot of time doing little researches, which leads me to invention that i want to introduce. I've learn a lot of information from this subforum, so i want to share my idea here. I believe it gonna be a second breath to independent anamorphic solutions. So I came up with what anamorphic lenses was originally created for: using whole image sensor area with benefits. Back then there was a film and now we have a 16:9 standart for video and to use it properly id suggest a simple technology: stack together two anamorphic lenses and rotate a camera 90 degree. And then applied 4x coefficient to 9:16 sensor area that results in 2,25:1 ratio: Of course if u shoot 4K RAW loosing some data is'nt a problem: u're still end up with proper resolution, color and details and even have nice possibility to recompose frame horizontally. But for 1080p recording cameras or 8-bit codecs loosing some data from sensor not the case, is'nt it?) So what do we have: - 4320x1920 (for 1080p) and 8640x3840 (for 4K) de-squeezed interpolated image that can be downscaled to 1920x850(840) with some color and sharpness benefits - stack of two anamorphic lenses required longer focal (about 150mm for sankor16f/rectimascope48 stack for FF) but with 4x it comes to pretty the same FOV as 85mm/2x on FF. It also requires smaller aperture to get same DOF. So it results in sharper image with same DOF (multiplied by lack of loss resolution in the camera). Of course increased number of glasses results in some lights losses, about 1 stop i think, maybe less. - one of the nicest feature of my scheme: it kills rolling shutter effect. I develope idea of that anamorphic solution with a7s model in mind, it's a great camera which suffer from well knowed issue: terrible RS. But when you rotate sensor and applied 4x stack of anamorhic you decreased RS effect in the final image by 4 times (since RS effect appears on horizontal which is became vertical). From now on forget about RS) - and one issue: its getting even harder to look at monitor: now its 4 times squeezed image. Honestly i always like to shoot anamorphic without desqueezing function that gives me some abstraction and somehow another vision of composition and im not suffering much from 4x squeezing to. Its hard to use monitor to nail a focus but easier with viewfinder. Actually i send a letter to atomos with asking for some cooperation here but got no respond (maybe a reason is my broken english, who know : ) Of course stack of two anamorphots is loosing any ability to focus, but it working well with diopters like usual combo of taking lens and ana - just set them all to infinity. And im asking here for some help. Im already tested my prototype (later im gonna do post about it) with usual diopters and it worked. But to use it properly i need some variable diopters and for now i can afford only SLR Rangefinder, which have not very high perfomance. But since aperture at my taking lens starts with 3,5 it may work. I know here's a guy, Tito, with a lot of anamorphic stuff, i will ask him for test, but maybe anyone have opportunity to try it to? PS I know my English is bad so i provided some pic for u guys)
  14. Of course i understand that. I just need to see the gap with my own eyes and decide to sacrifice mobility over color or opposite.
  15. Enjoy it) And now its time to find out that u need a positive diopters to focus closer than 4-5 meters. So give u another tip how to place it on rectima: unscrew front outer metal ring and u can use that thread - its standard diameter, dont know exactly number but i have 82mm lens hood that perfectly fits on that thread with front. And then u can easily screw 82mm diopters on a back of placed lens hood or use step-down (actually step-up ) rings to use any diameters u like
  16. here's even a bit wider fov on FF (no signs of vignette), its stills photos shot with 50mm Helios81H + Lomo NAS 35mm without cropping anything (and i can go 35mm/2.8 e-mount zeiss with 2.40 crop):
  17. also thinkin about getting mobile as much as possible, but my calculations included all the gears for shooting and edtiting. So i'm thinkin about a smartphone that can be used as additional video recorded device and also small monitor. There is software that allowed to use it wireless. But is there any phone with good enough screen for cg reference?)
  18. Here's some tips for u, maybe it will be helpfull: take some long focal lens and set it in focus (as much as possible in current condition) with rectimascope, u can use page with small font text as a focus target, loose the screws on a back lens of rectimascop, put rubberglove and place two fingers on opposite sides of a glass so there is space in between so u can see a result of your rotations in liveview (of course set it to max zoom). When u get a best sharpness press a glass tightly so it cant rotate anymore, put rectimascope vertically and tighten it. Then check sharpness again using liveview. Thats how i set sharpness with my d.o.industries 16f, things were easier for me because i rotate front glass, but i hope that scheme will work for u to)
  19. Just decided to upgrade to a7sii and then meet this thread (things will never be simple again ). Now i cant go any further before ill compare downscaled 4k 8bit 4:2:2 and 10bit from F3. Can anyone help me and provide some footage from F3? Google it but have no results. If someone has 60fps footage that would be totally great...
  20. also thinkin about getting mobile as much as possible, but my calculations included all the gears for shooting and edtiting. So i'm thinkin about a smartphone that can be used as additional video recorded device and also small monitor. There is software that allowed to use it wireless. But is there any phone with good enough screen for cg reference?)
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