4K and Lenses qestion

anatusa

anatusa

Veteran
Hello

I am kind of lost ..... everybody talking about 4k, and even locally, but i dont understand something - some says regular lenses are ok, some says its not ok..
Could some one plz explain about it! I am thinking about getting the new fs700, but want to be ready..... if i lets say will use it with current sony glass or canons - will it covers 4k?

same question for PL glass, or there are 2k PLs and 4k PLs, i am kind of confused...

just want to be clear about that, before sticking my fingers there....... so i could see if my budget will survive with future 4k option....


and 1 more thing not related to 4k - i always thought that i could use any pl lens with the pl adopter, but i ve been told recently that PL adopter and Nature pl mount is not the same, and that I will not be able to use just any PL lens with PL adopter is it true?
 
The sensor is 4k, but the same size as the FS100 is, so all lenses that will cover Super-35 will cover the sensor. Super-35 is essentially the same size at APS-C sensor, so practically any SLR lens or even the Nikon DX or Canon EF-s will cover the sensor fine.
 
considering stills have been 4k for ages I dont see the problem with stills lenses

if you want data on a specific (stills) lens there are millions of geek tests online that will outline the performance..

S
 
All stills lenses will handle resolution well beyond 4K. For example canon 7D produces images over 5K in resolution. Also the physical size of FS100/700 sensor is small enough to be covered by all stills lenses.
 
thats what i thought , but then i look at new canon lenses for their c300 and its says 4k ready..... so others are not ready?
 
morgan_moore said:
I guess some old SD television lenses are not 4k - maybe some cine lenses too - but I doubt that

(and the centre portion of medium format lenses)

But I think that phrase is really scaremongering

DP review has some nice info on stills lenses for example.. http://www.dpreview.com/lensreviews/sony_24_2_m15/3

S
Click to expand...

I love DP review.com

Wish there was a cinema lens version of the site. I'd do one if I worked in a rental house and had the time/resources. It's pretty amazing in regards to the visual vignetting information and other technical info.
 
Well... since most still cams are past 20mill pix, one would assume that the lenses build for those cams have enough resolution to utilize the 20mil decently. (newer lenses that is... I have no idea how much resolution old FD and C/Y lenses have fx)
 
Serious nerd alert..

One consideration is the angle the light hits the chip

Some digital sensors have a sensor well that does not react well to light hitting it at obtuse angles

This has created a difficulty in creating wide angle lenses for digital - it held up nikon from presenting DX (full frame) sensors for a few years

Now most still lenses are designed retrofocal due to the need to clear a flapping mirror, this implies that the light tends to hit fairly square on to the chip yeilding a good result

Some TV/Cine lenses may be less retrofocal and therfore induce CA etc (caused by the 'well problem')

A true 4k ready lens would account for this - some older film lenses may not..
 
It really boils down to a particular lenses ability to project an image circle large enough to cover a given surface area, the sensor. Many early cine lenses were designed to cover a 35mm film size frame and will vignette on larger sensor sizes, as many of us have found out shooting with the Epic. If you don't have access to a lens projector, shooting a white screen will show any edge fall off with your lenses for the aspect ratio you are shooting.
 
So any modern lens that was designed for full frame is ok for 4k...... good to know

what about my 2nd question about the PL adopters?
 
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