E mount Lens for VG-30

[RyanKhoo]

Vediamod Singapore Online Camera & Video Equipment Store | SLING Follow Focus
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Thanks bro, just bought this. But the "stick" cannot go one circle when on tripod leh ... Hmmmm....

 

[RyanKhoo]

Hi all experts here,

This is some experiment I done on my VG30 to get the bokeh effects.

The real pictures are brighter, not sure why on vimeo it looks blur & very much darker.

https://vimeo.com/72023418

The question I like to ask is the trasition/changes from the blur bokeh to fully focus, how how it is jerky, it looks like it goes in incremental. I would like it to go smoothly.

Any tips on where I went wrong ?

Thanks

 

[Bamboopictures]

Can share which lens you were using? Is it a fly-by-wire or mechanical lens?

 

[RyanKhoo]

Can share which lens you were using? Is it a fly-by-wire or mechanical lens?

Hi Bamboo, I am not sure what you meant by fly-by-wire lens or mechanical lens but I used the original Sony E-mount lens.

The lens used are:

35mm F1.8 Fixed Focal Lens
Model:SEL35F18
SEL35F18 : Fixed Focal Length : NEX Lens (E-mount) : Sony Singapore

and

the new E PZ 18-200mm F3.5-6.3 OSS Power Zoom lens that comes supplied with the NEX-GV30EH as a kit/bundled

Anyone here has any idea where I went wrong ?

Thanks.

 

[silvermoon1407]

Hi Bamboo, I am not sure what you meant by fly-by-wire lens or mechanical lens but I used the original Sony E-mount lens.

The lens used are:

35mm F1.8 Fixed Focal Lens
Model:SEL35F18
SEL35F18 : Fixed Focal Length : NEX Lens (E-mount) : Sony Singapore

and

the new E PZ 18-200mm F3.5-6.3 OSS Power Zoom lens that comes supplied with the NEX-GV30EH as a kit/bundled

Anyone here has any idea where I went wrong ?

Thanks.

All Sony E lenses are "fly-by-wire" i.e. turning of the focus ring triggers an electronic signal which drives the AF motor to turn and focus the lens. Mechanical lenses focus by directly turning the focus ring to move the glass elements.

To be honest, I think ur video was OK, but maybe it was because I viewed it on my phone. If you feel that your focusing is jerky, just practise more, although I must say it's harder to MF with nonmechanical lenses.

 

[Bamboopictures]

Your focus is soft on several of the attempts and "steps" in the focus travel is conspicuous. You can improve your focus by:

first, hitting the expanded view button and focus using the viewfinder.
or turn on focus peaking and look for the colored outline around your desired subject/
second, mark the focus point using a follow focus.
finally, defocus and rotate the focusing ring until you hit the mark.

 

[RyanKhoo]

Your focus is soft on several of the attempts and "steps" in the focus travel is conspicuous. You can improve your focus by:

first, hitting the expanded view button and focus using the viewfinder.
or turn on focus peaking and look for the colored outline around your desired subject/
second, mark the focus point using a follow focus.
finally, defocus and rotate the focusing ring until you hit the mark.

Thanks Bamboo, I have already turn on the peaking. I choose red color as peaking. But, I am still having problem focussing 100% right. My focussing is say maybe 90% correct but not spot on leh. On the LCD it looks okay (but the LCD is so small - pls do not ask me to use the EVF, I cannot with my spec on) but when I bring into Final Cut sometimes it looks a bit blur leh.

Also, how do I do this follow focus thing ? How do I mark the focus point.

Please take a look at this video, cut down from 1920 x 1080 to 640 x 360 so it looks really blur but you get the gist of it. I just wanna show you that after practise & practise, the changes from bokeh to focus still look jerky & looks like it changes in incremental steps leh.

https://vimeo.com/72086318

Any tips you can teach me ?

Can you try on your VG20 and see whether you have the same problem ?

Thanks again to all

Cheers

 

[Bamboopictures]

Using focus peaking is sometimes tricky if the focusing points are too near one another. The better option is really to use the expanded focus button and the EVF. You can adjust the diopter for your eye. If you have an external HDMI monitor/EVF, even better.
This video will help with the basic idea of marking focus:
Frugal Follow Focus for Under $15 - YouTube
Note that many autofocus zoom lenses today are no longer parfocal ie the focal point will change when you change the focal length. So avoid zooming unless you are very sure your lens is parfocal.

If you are very sure that you have executed the focus pull in one smooth contiunous motion and yet the focusing still occurs in stages, there really is nothing you can do as your lens is fly-by-wire. ie the internal motor is controlling the focusing while your mechanical action merely controls the motor.

Again that is why there is manual lenses are preferred for videography.