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  • Hey all, just changed over the backend after 15 years I figured time to give it a bit of an update, its probably gonna be a bit weird for most of you and i am sure there is a few bugs to work out but it should kinda work the same as before... hopefully :)

30MM Lens on the SCARLET

E

Eric-taner

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Will my 30mm Lens i use on my canon 60D, act wider on the scarlet because scarlet is 4k instead of the 60D that is 1080?

Or will it be the same?

Thanks.
 
J Davis said:
at 4k it will be the same field of view as your 60d
Click to expand...

Thanks davis, but i remember Jim mentioned that lenses on 5 will act wider then the do on 4k, so why isn't it acting wider on 4k then on 1080 ?
 
Eric-taner said:
Thanks davis, but i remember Jim mentioned that lenses on 5 will act wider then the do on 4k, so why isn't it acting wider on 4k then on 1080 ?
Click to expand...

Because it has everything to do with physical sensor size - and not resolution. Theoretically the sensor on my iPhone has a resolution of 1080, but the sensor size is ¼ of the nail on my pinky finger. So set aside the idea of 5k, 4k, 1080 for now and first look at what size the Scarlet sensor will 'window' to in relation to the sensor / film size you are accustomed to.

There are some great references elsewhere here on REDUSER and elsewhere on the web - abel cine - .

G.
 
1080p on your 60d is the full 18 megapixel sensor being downsampled
red can't / won't downsample because they are committed to delivering RAW, hence 2k and 3k are windows on the sensor
 
thanks guys, but it is right that the Epic in 5k mode will act wider then the scarlet in 4k mode on the same lens right?
 
On an Epic or Scarlet... it will be wider at 4k than 1080. But, 4k will be about the same fov as your 60D... lens wise. The crop is what changes this and your 60D doesn't crop in the same mannor as the RED's do.

In short... two completely different cameras. Just remember that your lenses will act about the same at 4k as they do on your 60D. 5k will be slightly wider and any res 3k and down will be longer. Look at these excellent charts to get a better idea. http://www.reduser.net/forum/showthread.php?66210-Scarlet-X-Data-Sheet
 
The long version! :

A sensor sized at 1920x1080 pixels would be quite small. The 60D sensor is large with many more lines of pixels than 1080. Therefore to get a resolution of 1080 pixels tall, it's using about one in every three lines and throwing away the rest, known as 'line skipping'. This is good in that you get the same field of view from your lenses (the sensor is still 'large') but bad in that it is the cause of a lot of artifacts (problems with the image, such as moire).

The Scarlet sensor will not line skip to get it's 1080 lines of pixels from it's sensor with many more lines. Instead it will take just the middle of the sensor like looking through a window, to the value of 1920x1080. However, because the bit of the sensor being used is technically making it the same as having a 'small sensor' to begin with, your lenses will behave differently - the field of view will be narrower.

To get around this the Scarlet can record in 'Quad HD' which is basically FOUR 1920x1080 frames forming a larger rectangle, with an overall resolution of almost exactly 4k. The idea behind this is that if you ultimately want 1080 video, you can just scale it down in post t exactly 25%. This is ESSENTIALLY what your 60D is doing in-camera, but obviously with a much larger image like Quad HD you can choose after shooting to 'zoom in' to any area of it, and as long as you don't scale past 25% you will have enough information to make up your desired 1080 image!
 
Eric, the Epic and Scarlet have the same sensor. The pixels will be the same size. In 5k mode you will be using more pixels over a larger surface area, and will therefore have a wider angle of view from any given lens.
 
Good answer Ben.

The scale factor to get QuadHD to HD is 50% because although it's 25% of the area, each length is 50% of the larger length. Because you do the scaling in post, properly, you get higher quality output with negligible aliasing, whereas if it's done poorly in-camera like on the vDLSRs that line skip, you get a mess. And the nice thing is, if you want the 4k (or Quad HD) to zoom in on, you've got that handy too.

Graeme
 
J Davis said:
I'm guessing its the sigma 1.4 you have?
Click to expand...

thats correct Sir, i hoped it will be wider on the scarlet, but you cant have everything i guess.

Any recommendations on wider lenses between 18mm and 25mm at a t stop of 1.4 or faster? but in the price segment between 500$ and 2000$?
 
Eric-taner said:
thats correct Sir, i hoped it will be wider on the scarlet, but you cant have everything i guess.

Any recommendations on wider lenses between 18mm and 25mm at a t stop of 1.4 or faster? but in the price segment between 500$ and 2000$?
Click to expand...

I can only think of two in the Canon EF mount at f1.4 (not T1.4). The sigma 30mm f1.4 and the canon L 24mm f1.4, both are going to be awesome to do portraits (portrait fov) at 2k overcrank. Because of the price, I predict that a lot of people will be buying the sigma
 
I own the sigma f/1.4 . It's definitely nice for achieving low DOF, BUT I should warn you it's very 'soft' at 1.4 ... VERY. I still like using it though...
I've been told that the canon is somewhat sharper, though havent tried it myself.

And of course, 30mm isn't within your range of 18-25.
 
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