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08-16-2017, 01:21 PM   #1
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Live view manual focusing

I had a hard time deciding on If I was going to return the Rokinon 85mm 1.4 but after messing around with it in live mode it made me grin once I started clicking. Why is getting the subject in focus with these things such a PITA using the viewfinder? I dont remember my 5D ii or 5D iii doing that and I owned the same lens for Canon. Seems like focus is a hit or miss in the finder but I will glady use live view now that I see what it can do.

08-16-2017, 01:30 PM   #2
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Focusing can be tough when the DoF is so shallow- but wouldn't AF confirmation help you out quite a bit in that case? The K-1 has a bigger VF so you'd think it would be easier to work with than the 5D's!

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08-16-2017, 01:34 PM   #3
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I think its because the AF blink notification is so large that its actually distracting when trying to focus on something. I remember even my old Pentax k10 was just a small dot that lit up.
08-16-2017, 02:02 PM   #4
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QuoteOriginally posted by nickc84 Quote
I had a hard time deciding on If I was going to return the Rokinon 85mm 1.4 but after messing around with it in live mode it made me grin once I started clicking. Why is getting the subject in focus with these things such a PITA using the viewfinder? I dont remember my 5D ii or 5D iii doing that and I owned the same lens for Canon. Seems like focus is a hit or miss in the finder but I will glady use live view now that I see what it can do.
LiveView mode focus requires two things. focus peaking and digital zoom. Without zoom in, your focus might or might not be accurate. The sampling of real live data to calculate focus peaking on fly depend on the actual capturing resolution on fly. In reality, real time capturing resolution is the challenge of a such focus peaking system. You simply don't have enough information to determine object outline with small screen and small resolution capturing. It will end up it looks like it's focus EVERYWHERE.

This is the reason why focus peaking gets better when you have high res LCD and high res real time live capture. Especially in something as a full frame (Sony A7 series) makes way better focus peaking than any Fuji X cameras I ever owned. Simple truth! full frame capture much high res live data than Aps-c.

but also..... high res live capture system does better than lower res one.

08-16-2017, 02:55 PM   #5
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Thanks for the explanation
08-16-2017, 02:59 PM   #6
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It is called the peril of progress........Yes we have a 36mp camera which can produce outstanding images, but it will also more readily show up and deficiencies we have in our technique. If your manual focus is slightly out you will get an awful result when viewed at 100%

Don't rely on the AF confirmation, or if you do you may need to make a global AF Fine Adjustment with that lens. I find manual focussing a hell of a lot easier with the K1 compared to my previous K10
08-16-2017, 03:19 PM   #7
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Would I still be able to take a focused shot to the left of the frame if I had focused through the view finder?
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Last edited by nickc84; 08-16-2017 at 03:25 PM.
08-16-2017, 03:31 PM   #8
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QuoteOriginally posted by nickc84 Quote
I think its because the AF blink notification is so large that its actually distracting when trying to focus on something. I remember even my old Pentax k10 was just a small dot that lit up.
You can turn it off via C9 and the viewfinder overlay menu:






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08-16-2017, 03:49 PM   #9
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QuoteOriginally posted by nickc84 Quote
Would I still be able to take a focused shot to the left of the frame if I had focused through the view finder?
That depends entirely on how good your eyes are. Assuming they are fine, why would one part of the frame be any different to another ?
08-16-2017, 04:04 PM   #10
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QuoteOriginally posted by nickc84 Quote
Why is getting the subject in focus with these things such a PITA using the viewfinder?
Short list:
  • Very shallow DOF at f/1.4 coupled with fairly low contrast wide open
  • Focus sensitivity of even the K-1 viewfinder is somewhat lower than those in historic manual focus SLRs (somewhere around f/3.5)
  • Best case sensitivity for focus confirm of only f/2.8, meaning that the ability to detect OOF condition is the same at f/2.8 as at f/1.4
FWIW, the stock focus screen* in the 5DII is no better and the focus confirm no more sensitive.

one more thing: Those extra pixels on the K-1 over the 5DIII place a higher burden on the focus. Try downsampling your K-1 shots with the 85/1.4 to 22Mpx. With any luck the focus performance will be comparable to what you got with your Canons.


Steve

* Canon does support the Eg-S screen for the 5DII which should rock with faster lenses

Last edited by stevebrot; 08-16-2017 at 04:15 PM.
08-16-2017, 04:12 PM   #11
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QuoteOriginally posted by Adam Quote
You can turn it off via C9 and the viewfinder overlay menu:


Awesome!
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