sgblade + hv20
- Thread starter astigmatic
- Start date
astigmatic
Well-known member
Too bad nobody explained it before on forums here and it should be sticky , you should be able to zoom in all the way into the SLR lens without losing focus ,then you wont get any vignetting cause you will be able to zoom in.
Its really matter of milimeters and not lazy job,i had my adapter set in wrong distance just today i decided to do something about it and i found the perfect distance where i can zoom into lens with focus ,previously i couldnt and with less light i had more vignetting.Spacers are helpful but still its really matter of milimeters ,focusing screen distance has to be perfect and camcorder distance from screen has to be perfect too ,then youve got properly working adapter without vignetting cause you can zoom in to the maximum into your SLR lens.
OF course in front of the camcorder you need achromat or macro lens but with macros youll get chromatic abberations.
Its really matter of milimeters and not lazy job,i had my adapter set in wrong distance just today i decided to do something about it and i found the perfect distance where i can zoom into lens with focus ,previously i couldnt and with less light i had more vignetting.Spacers are helpful but still its really matter of milimeters ,focusing screen distance has to be perfect and camcorder distance from screen has to be perfect too ,then youve got properly working adapter without vignetting cause you can zoom in to the maximum into your SLR lens.
OF course in front of the camcorder you need achromat or macro lens but with macros youll get chromatic abberations.
astigmatic
Well-known member
personally I don't like zooming in, and I hope that's not what the spacer is for. Because if the solution to get rid of vignetting is to zoom in, then one will ruin proper framing. Like your wide angle lenses will become standard and your standard will be like telephoto..
Wayne Kinney
DVXUser Sponsor
Yes, you should not simply 'zoom in more' to remove vignetting, this will loose FOV and reduce the benifit of using an adapter in the first place.
I investigated much more today and you guys are right ,i was losing huge amount of view field ,then i tried to put DCX lens in front of the camera but quite far and i had almost the same FOV as my focusing screen from old camera.
Is it better to get as big DCX as possible ? Or it doesnt change the thing that much ? And focal lenght? Which one is the best if i would want to get 70mm DCX cause i cant zoom in to get 4:3 ,i can only get 16:9 cause i just crop to not have corners of DCX on screen.
Also if you move camera back you will get less vigneting but also less field of view unless its done really perfect.
Sorry for spam.
Is it better to get as big DCX as possible ? Or it doesnt change the thing that much ? And focal lenght? Which one is the best if i would want to get 70mm DCX cause i cant zoom in to get 4:3 ,i can only get 16:9 cause i just crop to not have corners of DCX on screen.
Also if you move camera back you will get less vigneting but also less field of view unless its done really perfect.
Sorry for spam.
astigmatic
Well-known member
hmm, do they make dcx lenses with filter threads? how are you mounting it?
I wonder if placing one after the flip achromat will fix the vignetting.
I wonder if placing one after the flip achromat will fix the vignetting.
I wonder why the stock lens should be of any influence on the quality of the picture because the only function left for the stock lens in this "35mm configuration" is to focus on the ground glass or not? IMO the picture you get is created by the slr lens in front of the adapter. The other players are of course the achromat, the flip module and the groundglass, but if the stock lens is ok, the picture on the ground glass is ok, then everything should be ok or not????????????????????????????????????
I dont think its about stock lens but about low light sensivity of the sensor and stuff like that ,also resolution of sensor ,youre losing some amount of resolution with adapter,especially home made ,so if you have something recorded in 1080 then if you scale it down to 720 it would look sharper,and if you will record it in 720 and compare it to scaled down 720 then original 720 would be softer too.Scaling down help with sharpness,its better to record in 1080 and scale to 720 than record in 720 from beginning.
Ahh.. but maybe some stock lenses are better on zooming cause i know that youre losing some sharpness when you zoom in on some camcorders.
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I dont have threading for DCX and you wouldnt want to see how i mounted it :-Laugh(DBG):
But seriously you can adjust things by hand but it takes whole day,and i mean that ,i was testing and adjusting adapter yesterday more than 12 hours.Moving camcorder and moving DCX,checking where field of view is smaller and where vignetting starts...then hotglue everything in place.
Ahh.. but maybe some stock lenses are better on zooming cause i know that youre losing some sharpness when you zoom in on some camcorders.
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I dont have threading for DCX and you wouldnt want to see how i mounted it :-Laugh(DBG):
But seriously you can adjust things by hand but it takes whole day,and i mean that ,i was testing and adjusting adapter yesterday more than 12 hours.Moving camcorder and moving DCX,checking where field of view is smaller and where vignetting starts...then hotglue everything in place.