Panasonic GH4K

[mcmxcii]

Using manual lens focusing.

Touch screen is the worst focusing method IMO. Maybe good for those OTOT personal short film.

But how to use manual focus on fast-moving subjects
such as hyperactive kids and animals? I find it very challenging!

 

[Deunamist]

But how to use manual focus on fast-moving subjects
such as hyperactive kids and animals? I find it very challenging!

Ahahaha.. that type you should be shooting at a smaller aperture, less depth of field!

Using manual lens focusing.

Touch screen is the worst focusing method IMO. Maybe good for those OTOT personal short film.

if OTOT should just use manual focus pulling lah. I think all these new and gimmicky AF features don't really match up to the precision and beauty achievable with manual focus pulling.

 

[mcmxcii]

Thanks, XsenseX and Deunamist, for answering my questions.

 

[XsenseX]

But how to use manual focus on fast-moving subjects
such as hyperactive kids and animals? I find it very challenging!

Haha ... I started video with 5D2 + 24mm f/1.4

I'm used to focus pulling ... and f/1.4 on Full Frame is no joke.

To me the GH3/4 mirrorless type cameras with 2x crop is very forgiving to focusing but i still hate the electronic focusing ring on the lumix 12-35 and 35-100.

 

[XsenseX]

if OTOT should just use manual focus pulling lah. I think all these new and gimmicky AF features don't really match up to the precision and beauty achievable with manual focus pulling.

No lor ... I see some of those Nafa students doing their own project on the streets and i'm sure i saw them pushing the LCD at different positions and looking at the focus.

I think they were using 70D on a tripod.

Film students already so lazy ... how singapore film industry grow sia ...

 

[Deunamist]

No lor ... I see some of those Nafa students doing their own project on the streets and i'm sure i saw them pushing the LCD at different positions and looking at the focus.

I think they were using 70D on a tripod.

Film students already so lazy ... how singapore film industry grow sia ...

that's quite sad, but film students seldom end up as DPs or cameramen.. Lol should give them manual lenses to play with see how they tackle it

 

[astrocom]

Ryan will be happy with this. Something nice for GH4 owners.
http://nofilmschool.com/2014/09/slr...ght-be-perfect-wide-angle-prime-panasonic-gh4

 

[RyanKhoo]

Thanks astrocom,

10mm/T2.1

The Aperture is F2.1 ?

Thanks

Ryan will be happy with this. Something nice for GH4 owners.
http://nofilmschool.com/2014/09/slr...ght-be-perfect-wide-angle-prime-panasonic-gh4

 

[Bamboopictures]

T-stops vs F-stops
http://blog.mingthein.com/2012/03/26/the-confusion-between-t-stops-and-f-stops/

 

[RyanKhoo]

T-stops vs F-stops
http://blog.mingthein.com/2012/03/26/the-confusion-between-t-stops-and-f-stops/

Thanks Bamboo ...

But after reading it, I am even more confused ... hahaha

:embrass:

 

[Bamboopictures]

Thanks Bamboo ...

But after reading it, I am even more confused ... hahaha

:embrass:

T stop cannot be less than f stop of a lens
F stop is derived from aperture dimension and focal length but does not factor in quality and design whereas t stop is a better indication of light loss as it travels through the lens elements

 

[kandinsky]

My own basic understanding: While F-stops are calculated mathematically, T-stops are a calibrated measurement of the actual light transmission through a lens.

E.g. In the context of a film set, if a scene is lit for T2.0, you can easily swap different types of lenses (prime/zoom), and even across manufacturers, as long as it's set at T2.0. The exposure will be consistent.

A T-stop (for Transmission-stops) is an f-number adjusted to account for light transmission efficiency (transmittance). A lens with a T-stop of N projects an image of the same brightness as an ideal lens with 100% transmittance and an f-number of N. For example, an f/2.0 lens with transmittance of 75% has a T-stop of 2.3. Since real lenses have transmittances of less than 100%, a lens's T-stop is always greater than its f-number.[6]
Lens transmittances of 60%–90% are typical,[7] so T-stops are sometimes used instead of f-numbers to more accurately determine exposure, particularly when using external light meters.[8] T-stops are often used in cinematography, where many images are seen in rapid succession and even small changes in exposure will be noticeable. Cinema camera lenses are typically calibrated in T-stops instead of F-numbers. In still photography, without the need for rigorous consistency of all lenses and cameras used, slight differences in exposure are less important.

http://en.wikipedia.org/wiki/F-number#T-stop

In practice, even the best lenses exhibit light absorbance, effectively “stealing” some of the light going through them. This means that if you calculate the exposure based on the f-stop of the lens, you will end up underexposing the image, because less light is reaching the film plane than is expected in theory. T-stops are the f-stop of the lens corrected for its absorbance and reflectance. The T-stop is the true speed of the lens, calculated by compensating for its light absorbance and reflectance, and will result in accurate exposure.

http://www.lavideofilmmaker.com/cinematography/f-stops-focal-length-lens-aperture.html

 

[Deunamist]

Haha.. basically..

when light shines into a dark room from the outside, the measured amount of light at the opening of the room is the F-Stop, while the measured amount of light at the opposite end of the room is the T-Stop.

 

[RyanKhoo]

Haha.. basically..

when light shines into a dark room from the outside, the measured amount of light at the opening of the room is the F-Stop, while the measured amount of light at the opposite end of the room is the T-Stop.

Ok so basically, F-stop is the amount of light entering the shutter and T-stop is amount of light touches the sensor ? Correct boh ?

 

[Deunamist]

Ok so basically, F-stop is the amount of light entering the shutter and T-stop is amount of light touches the sensor ? Correct boh ?

yes correct. Lol.

 

[RyanKhoo]

yes correct. Lol.

Hahaha ... so F-stop and T-stop are almost the same lah, just splitting hairs only ... :dunno: :bsmilie:

Deunamist, u r d best, simple analogy for layman like me :thumbsup:

 

[Deunamist]

Hahaha ... so F-stop and T-stop are almost the same lah, just splitting hairs only ... :dunno: :bsmilie:

Deunamist, u r d best, simple analogy for layman like me :thumbsup:

no problem bro... I wrote a blog post on my super dead blog abt this earlier this year... Lol u can check it out in my signature

 

[RyanKhoo]

no problem bro... I wrote a blog post on my super dead blog abt this earlier this year... Lol u can check it out in my signature

Wow, nice blog you have there, bro ! :thumbsup:

 

[RyanKhoo]

Lotsa nice videos here:
http://panasonic.net/avc/lumix/dslm/gh4_special/


http://www.youtube.com/watch?v=Us7LLO9iI1g

 

[JacePhoto]

nice. thanks for sharing.