Author Topic: α700 AUTO overrides MF setting ... with AF!  (Read 4804 times)

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DonSchap

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α700 AUTO overrides MF setting ... with AF!
« on: November 21, 2007, 01:03:58 AM »
This is something 'new' for me and it may be "old" news to you folks, but I had "MF" set on the 'focus mode lever' of the camera ... then reached up and threw the 'MODE dial' to AUTO ... and suddenly the lens started focusing in AutoFocus (despite the 'focus mode lever' setting!).  Talk about an unexpected "mode reset."  Geez!



That's a bit unnerving and a bit dangerous to the equipment, when you are setting up a MACRO shot with your TAMRON SP AF 180mm f/3.5 Di LD and it starts crawling around in your supporting hand.  Thank goodness it's not a fast focus, or the entire rig would have wound up on the floor ... as the 2/3rds of the lens barrel is turning during focus, when the lens' "One-touch" M/AF Slide is in the M-position.

Apparently there is no "manual focus" in the AUTO mode, unless you press the "AF/MF" button on the upper right hand rear of the camera and HOLD it with your thumb.  Admittedly, I found that just a little strange, to be honest, and hard to maintain a positive grip on the camera body while focusing with the left hand.



Anyone else gotten this kind of surprise out of their lenses, when suddenly, you are no longer "manually" focusing?

Also ... the α700 will only "home" (take the lens back to "infinity"-focus) a lens for one-second max, when you shut it off.  That may not be enough time to completely roll back the focusing elements to the "infinity" stops, which could result in lens damage, when storing ... because the elements are still out there, in the focusing gears.  Turn it on and off again, just to be sure.

By the way, the α100 does not do this ... when the AF/MF slide switch on the α100 is set to "MF" ... it means it ... no matter what mode you select.  And there is no "AF/MF" button on the back, just an 'AV' button for exposure adjustment.

Little weird stuff ... you should probably know about, before your non-internally focusing lens runs away with itself.
« Last Edit: November 21, 2007, 03:41:35 AM by DonSchap »

Offline fother

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Re: α700 AUTO overrides MF setting ... with AF!
« Reply #1 on: November 21, 2007, 03:56:14 AM »

Don,
that's interesting.


Not sure why the a700 even has an AUTO mode, seems like most users of an 'advanced amateur' model would be past the point of needing the fully automated 'point&shoot' functionality!

Anyway, I'd really suggest not using AUTO mode for macro photography -- much better control in Aperture priority mode or fully Manual mode.

DonSchap

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Re: α700 AUTO overrides MF setting ... with AF!
« Reply #2 on: November 21, 2007, 04:03:26 AM »
Oh, doggone ... I thought AUTO was for those folks who had progressed beyond having to manually set the camera up. :o
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Yeah ... right.  C'mon ... it was just something I felt we all need to be aware of ... before disaster strikes you "unaware." 

AUTO was really designed so you could toss your rig at your significant other and say "Hey, take my fugly mugly, will ya?"

By the way, the AF/MF button can be set to "toggle" in the controls menu, so you do not have to hold it down.  Just give 'er a tap.  Remember: when you do stop the AF from running, in this way ... it also WILL NOT HOME the lens, when you shut it off.  But, if you turn it on and off again ... it will. (Don't you just love side-effects?)
« Last Edit: November 21, 2007, 04:13:24 AM by DonSchap »

Offline fother

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Re: α700 AUTO overrides MF setting ... with AF!
« Reply #3 on: November 21, 2007, 04:07:57 AM »

... it was just something I felt we all need to be aware of ... before disaster strikes you "unaware." 


I agree, quite an interesting function. Does the manual say anything about it? There may be some rationale for it ... dunno what though :)

DonSchap

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Re: α700 AUTO overrides MF setting ... with AF!
« Reply #4 on: November 21, 2007, 04:19:38 AM »
On page 52/53 of my "U.S.A." manual, it it described under "Selecting the focus mode", in the "Using the shooting functions" chapter.  It kind of covers it ... but you need to experiment to fully appreciate all the little idiosyncrasies.

Predictive focus, I'm assuming, is not possible with the SONY α700.  It will actively follow your AF area (real time) ... as you look through the viewfinder ... with prefocus and try to keep up with the movement ... but in burst mode ... it just doesn't, as far as I have been able to determine.  Perhaps it depends on the speed of the object, but I am not noticing corrective computation as the shutter fires.  I know I need to play with this more, to be conclusive, but I would appreciate anyone else's insight on this elusive "feature?"

I guess the real question is ... is there anything like Canon's "AI SERVO" mode on this camera? or even "AI FOCUS"?

« Last Edit: November 21, 2007, 04:34:48 AM by DonSchap »

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Re: α700 AUTO overrides MF setting ... with AF!
« Reply #5 on: November 21, 2007, 04:21:24 AM »

cool


so what were you shooting? gonna share some pics? :)

DonSchap

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Re: α700 AUTO overrides MF setting ... with AF!
« Reply #6 on: November 21, 2007, 04:47:13 AM »
I'm just experimenting with functionality, right now.  Learning my newer lenses and how they cooperate with the α700 camera body.  The MACROs are an interesting breed, to be sure, but are rather "anal" with autofocus.  The SP AF 180mm f/3.5 Di LD loves to wander ... and focus isn't all THAT fast with it ... nor should it be, I suppose.  Little tight adjustments, more often than not.

I'll be doing some HDR shots with it, later in the week, to complete the college assignment in my Adv. Digital class.  I haven't done them before, but I have a few ideas.  It will have to be indoors, because our weather is just going to hell with a handbasket, this holiday.  Then I have to print the work, for the final critique.

It if turns out well enough, I will also submit it for my Color Management class ... to reduce the number of assignments the two classes have requested.  It is roughly 30, so far.  20 of which have to be mounted, if I do not duplicate some.

Did some strobe stuff  and second shutter on a 2 second exposure ... for the "Depict Motion" assignment:





But I am finding this kind of exposure very hard to print on paper, due to the neon-effect necessary to get the gamut correct.  That bright pink is very hard to get right on a reflective surface.  The monitor, of course, generates light, so it has no issue with it.  Perhaps, I should submit my monitor as my medium for the critique?  Now, there's a thought! :D
« Last Edit: November 21, 2007, 04:51:52 AM by DonSchap »

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Re: α700 AUTO overrides MF setting ... with AF!
« Reply #7 on: November 21, 2007, 04:53:01 AM »

um, looks like you've edited your posts after I'd responded, so my responses probably no longer make sense (I can't work out what's new and what's not, but I can't follow it any more)...


anyway, interesting photos! post some more in the share your images board!! :D

DonSchap

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Re: α700 AUTO overrides MF setting ... with AF!
« Reply #8 on: November 21, 2007, 05:02:55 AM »
Okay ... here was a shot I took 18 years ago, with the Minolta Maxxum 7000 and the 50mm f/1.7 lens.  Perhaps one of my best "early efforts":



It definitely got some attention in the school, back then.  LOL  Back when AF was something relatively new and unusual in a camera ... only from the mind of Minolta.
« Last Edit: November 21, 2007, 05:09:10 AM by DonSchap »

Offline Clive

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Re: α700 AUTO overrides MF setting ... with AF!
« Reply #9 on: November 21, 2007, 05:19:54 AM »
Oooh.. Love the neons. Wow!
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Re: α700 AUTO overrides MF setting ... with AF!
« Reply #10 on: November 21, 2007, 09:10:59 AM »
Surely if you were doing a lot of manual focusing i.e. with a macro you would turn the dial on the front to M.  The button I would only use if there was a picture the camera had focused that I wanted to slightly adjust.  I have started checking that I have turned the dial in the front back to one of the AF types before shutting off the camera as I have recently forgotten it was is manual focus when switching it on with a wide angle lens and started snapping away without focosing - doh!
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Offline d7d (aka Ronin, aka Shot by scott)

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Re: α700 AUTO overrides MF setting ... with AF!
« Reply #11 on: November 21, 2007, 10:21:35 AM »
I am just trying to think if the dynax 7d did that as well but to be 100% honest I dont know. what I always wonder about what have MF on the front focus leaver any way I only ever use the AF/MF button to change any way