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FE70-200 AF sequence

Discussion in 'Sony Alpha E-Mount Lenses' started by WT21, Mar 27, 2015.

  1. WT21

    WT21 TalkEmount Top Veteran

    610
    Aug 7, 2011
    I think this lens is going to work for my needs. At least so far the testing in good light is coming out well.

    This is my daughter doing some trampoline somersaults, shot for an AF test

    I rolled off almost 100 frames and very few missed focus. Those that did were mostly due to me not keeping her in the PDAF portion of the frame.

    16763399979_f3e6b76d40_z. 20150324-20150324-DSC08340 by wt2100, on Flickr

    16329548293_574ff6fccf_z. 20150324-20150324-DSC08341 by wt2100, on Flickr

    16742261687_e99b12c897_z. 20150324-20150324-DSC08342 by wt2100, on Flickr

    16948302862_b9dd62c579_z. 20150324-20150324-DSC08343 by wt2100, on Flickr

    16949621275_798eb77468_z. 20150324-20150324-DSC08344 by wt2100, on Flickr

    16763392689_2feb6644b7_z. 20150324-20150324-DSC08345 by wt2100, on Flickr

    16762147940_5154c75b5e_z. 20150324-20150324-DSC08346 by wt2100, on Flickr

    16761923728_9ef79de053_z. 20150324-20150324-DSC08347 by wt2100, on Flickr
     
    Last edited: Mar 28, 2015
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  2. davect01

    davect01 Super Moderator

    Aug 20, 2011
    Fountain Hills, AZ
    Dave
    Not bad at all :)

    Only critique would be that I would like to see more of her face.
     
  3. robbie36

    robbie36 TalkEmount Veteran

    488
    Nov 21, 2014
    Did you use high speed continuous shutter or low speed continuous shutter?
     
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  4. WT21

    WT21 TalkEmount Top Veteran

    610
    Aug 7, 2011
    I dont honestly remember, but these are all the shots in the sequence so i dont think it was a very high shutter rate.

    Also i think i remember having the live view, which would mean the lower shutter rate?

    EDIT: I was assuming the a7 had a more modern 10+fps at high speed. I see now it's only 5, so it's likely this was high speed.
     
    Last edited: Mar 28, 2015
  5. WestOkid

    WestOkid TalkEmount All-Pro

    Jan 25, 2014
    New Jersey, USA
    Gary
    Nice sequence. What camera is this?

    BTW - Unlike a DSLR, mirrorless shutter is not affected by live view because it is always on live view whether you use the LCD panel or the view finder. Also, what Rob is referring to is what amount of continuous frames per second used. there is high and low. Shutter speed isn't impacted. for the A7 it's 2.5fps continuous or 5fps in Speed Priority mode. The A6000 has high and low speed continuous, with high being 11 fps.
     
    Last edited: Mar 28, 2015
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  6. WT21

    WT21 TalkEmount Top Veteran

    610
    Aug 7, 2011
    Thanks. Gear is in my sig.

    This is not completely true. It depends on the equipment. I had not looked at the continuous specs of my a7, but with my GX7 (also mirrorless) at high and super high burst settings, there is no live view. Having now looked at the a7 specs, I didn't realize how shamefully low they are (2.5/5.0). These, honestly though, are fine for me. I've never (or maybe very rarely) used the 11fps or 40fps the GX7 is capable of.

    Also, many action shooters have complained about mirrrorless EVF because of the inherent lag, making it harder to keep a moving subject where you want it in the frame. The "live view" of a quality mirrored system for sports shooting is still in many ways more efficient than an EVF, though that gap is closing (if not already closed??)

    Sorry if my terms were not clear. I was typing while tired. I said shutter rate, not shutter speed. I meant burst rate. fps would have been more clear. Shutter speed and burst rate could collide if you tried to use a slow enough shutter speed, though at only 5fps, that would be a slow shutter indeed.
     
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  7. WT21

    WT21 TalkEmount Top Veteran

    610
    Aug 7, 2011
    This was meant as an AF test. I was looking to see if the lens can do what I need. The lens + camera can, though I have since learned the burst rate is pretty low. I think 5fps can support what I need, but at any rate, the lens is performing.
     
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  8. WestOkid

    WestOkid TalkEmount All-Pro

    Jan 25, 2014
    New Jersey, USA
    Gary
    Nice to know that when I ever get the money I can get this for girls basketball. :)
     
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  9. WT21

    WT21 TalkEmount Top Veteran

    610
    Aug 7, 2011
    I read some reviews, and this thing is supposed to rock on the a6000.
     
  10. WestOkid

    WestOkid TalkEmount All-Pro

    Jan 25, 2014
    New Jersey, USA
    Gary
    Nice. I have the a6000 too
     
  11. davect01

    davect01 Super Moderator

    Aug 20, 2011
    Fountain Hills, AZ
    Dave
    Turned out well.
     
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  12. robbie36

    robbie36 TalkEmount Veteran

    488
    Nov 21, 2014
    The reason I ask about this is that the Gary Friedman book says this about 'high speed continuous shooting'....

    'The one thing to be aware of is that, unlike the slower continuous shooting mode, in this mode there is NO autofocusing or autoexposure occurring between shots. The focus is locked in at the first frame and will stay locked until you remove your finger from the shutter release.'

    Now this isnt unusual. My EM1 locks exposure for 'fast continuous' shooting (about 10 fps) but refocuses with low continuous (6.5 fps). Looking at your shot sequence it probably wouldnt have made much difference on the basis that the young girl is moving on a horizantal plane to you. However, Tom has shown a sequence in the 70-200 thread with a young girl skiing to wards the camera which seems to show the camera refocusing at 'high speed continuous frame rates'. If that is what the camera does then 5 fps isnt a bad speed at all for a camera that is refocusing.

    Anyway I am unsure whether Friedman has got this wrong or not (I hope he has). I plan to test it for myself when I have some time.
     
  13. tomO2013

    tomO2013 TalkEmount Veteran

    375
    Dec 11, 2014
    I'll post some more sequences if you would like.
    I've seen the same book - all that I can say is that I've used it on a number of occasions with great results (high speed and continuous AF) with both the LAEA4 adapter and 70-400 G2 and also the FE70-200 F4 G lenses.
    I did a little test today where I did not use the lock-on flexible expanded spot feature , merely usingly the flexible spot medium and also zone focus. In both cases it looks like it locked focus on the first frame with the initial burst shot ... which would be what I would expect. When I go to expandable flexible spot I can see the green target reconfirming between shots on the same setting. My shutter speed does not look to be impacted. Note also Gary Fongs video here where he explains it.



    A6000 but similar technique and settings but slower shutter speed. Most of this is still applicable to A7ii..


    This is with lock-on only but shows the tracking capability. His review of A7ii comparing old and new object tracking.


    This is on the a77ii (Not the a7ii). Same technology is available (not as effective but still extremely good in the A7ii).
    He explains the lock on expanded flexible spot!


    Hope this is useful.

    Tom.
     
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