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A77ii v A68 v A58 AF

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Miranda F View Drop Down
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Post Options Post Options   Quote Miranda F Quote  Post ReplyReply Direct Link To This Post Topic: A77ii v A68 v A58 AF
    Posted: 28 August 2018 at 13:30
Took some very low-light portraits with the Sony 85mm f2.8 (a dimly lit underground restaurent, actually) and noticed once again how poor the AF on my A58 is in low light, though it is fine in normal lighting. Specifically, it had great trouble focussing on faces. Had a lot of OOF pics in AF (and a few in MF, to be fair. )

So, first question: I know both the A77ii and the A68 have a lot more focus points than the AF. Do they also have better AF in low light, and if so, how much better? Would I actually notice an improvement over the A58?

Second question: How much difference is there between the A77ii and A68 in capability? I'm struggling to find much difference at all from the specs, apart from the smaller EVF and LCD. Given how much cheaper the A68 is, what would I be missing most wrt an A77ii?
Miranda F & Sensorex, Sony A58, Nex-6, Dynax 4, 5, 60, 500si/600si/700si/800si, various Sony & Minolta lenses, several Tamrons, lots of MF primes and *far* too many old film cameras . . .
 



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QuietOC View Drop Down
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Post Options Post Options   Quote QuietOC Quote  Post ReplyReply Direct Link To This Post Posted: 28 August 2018 at 14:46
There do seem to be differences for cameras with the "same" AF sensors. The A65 seemed to focus better than the A58. I assume this might be because of power strategy. Some A58 reviews mention problems with the AF in low-light.

The individual AF sensors in the A68 don't seem to be as sensitive as those in the A65 despite being rated for -2 Ev compared to -1 Ev. I noticed this indoors while testing teleconverters. The A65 would focus more reliably in those conditions. The A68 does have the central F2.8 AF sensor. I find the A68 AF system to be quite good in general. It is better than the A6000 and the Nikons I compared it with.

There might be a focus adjustment needed which the A68 does allow like the A77II.

The A6300 seemed to focus A-mount lenses via the LA-EA1 very well indoors too. It is also rated -1 Ev. The A6300 might have even better AF with an LA-EA3, as the LA-EA1 doesn't support the latest A-mount communication.

The red AF illuminator on the original A77 is probably the most reliable low-light AF setup, but I haven't tried either A77 model yet.

If you like manual focus be aware the peaking levels are set quite high on the A68. At least the "Low" setting is often much higher than I want it.

Edited by QuietOC - 28 August 2018 at 18:32
Sony A68 A77II A6000 A7II LA-EA3 LA-EA4 MC-11
Minolta Maxxum 600si
Pentax Q7 5-15 15-45/2.8
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BearairCactus View Drop Down
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Post Options Post Options   Quote BearairCactus Quote  Post ReplyReply Direct Link To This Post Posted: 28 August 2018 at 14:56
Hi Miranda,
I have an A68 and when buying it looked very hard at the differences between the A77ii and the A68. The differences I noticed most were, A68 screen only tilts and is smaller and lower resolution. No weather sealing on A68. No digital level on A68, smaller buffer and write speed. However for the cost difference I considered these to be a fair trade off, the focusing system is the same and so is the sensor. Now I have used the A68 for over a year my only complaint with it is that sometimes when shooting lots of sports shots in Raw (normally surfing) the buffer can run out quite quickly.

I cannot compare the focusing with an A58, only a A700 and a Panasonic GX80, it is much better than either of the other two. The only time I have an issue was when taking some pictures in a dark wood at night, frankly I was surprised I got any focus lock at all! expecting to have to shot MF.

To give you an idea I was shooting pictures of Christmas Steps at 22.00 in Bristol last week without any issues at all.

The only lenses I have are Minolta lenses so I would expect even better performance with modern fast Sony's.

Roger
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QuietOC View Drop Down
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Post Options Post Options   Quote QuietOC Quote  Post ReplyReply Direct Link To This Post Posted: 28 August 2018 at 15:10
Originally posted by BearairCactus BearairCactus wrote:

Hi Miranda,
I have an A68 and when buying it looked very hard at the differences between the A77ii and the A68. The differences I noticed most were, A68 screen only tilts and is smaller and lower resolution. No weather sealing on A68. No digital level on A68, smaller buffer and write speed.

The write speed on the A68 is the same as the A77II. [Edit: the A77II does write somewhat faster] The UHS support is a big upgrade from the A65/A57/A58 which don't support UHS. The buffer is bigger than the A58 and seems better than the A65 (which had the same buffer size as the A77.) But maybe the write speed and slower frame rate just masks the actual buffer size.

Edited by QuietOC - 18 April 2019 at 12:10
Sony A68 A77II A6000 A7II LA-EA3 LA-EA4 MC-11
Minolta Maxxum 600si
Pentax Q7 5-15 15-45/2.8
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Post Options Post Options   Quote BearairCactus Quote  Post ReplyReply Direct Link To This Post Posted: 28 August 2018 at 15:24
Originally posted by QuietOC QuietOC wrote:

Originally posted by BearairCactus BearairCactus wrote:

Hi Miranda,
I have an A68 and when buying it looked very hard at the differences between the A77ii and the A68. The differences I noticed most were, A68 screen only tilts and is smaller and lower resolution. No weather sealing on A68. No digital level on A68, smaller buffer and write speed.

The write speed on the A68 is the same as the A77II.


I stand corrected, the rest of your post I never mentioned.
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sybersitizen View Drop Down
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Post Options Post Options   Quote sybersitizen Quote  Post ReplyReply Direct Link To This Post Posted: 28 August 2018 at 16:33
Originally posted by QuietOC QuietOC wrote:

The A68 live-view feed doesn't black out like the A58.

If I'm understanding what you mean, this is news to me. Do you mean what's displayed on the LCD or EVF during continuous shooting? What specific drive modes (frame rates) are you talking about, and what are the visual differences among them?
 



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QuietOC View Drop Down
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Post Options Post Options   Quote QuietOC Quote  Post ReplyReply Direct Link To This Post Posted: 28 August 2018 at 17:02
Originally posted by sybersitizen sybersitizen wrote:

Originally posted by QuietOC QuietOC wrote:

The A68 live-view feed doesn't black out like the A58.

If I'm understanding what you mean, this is news to me. Do you mean what's displayed on the LCD or EVF during continuous shooting? What specific drive modes (frame rates) are you talking about, and what are the visual differences among them?

Yes, the A58 interrupts either display and shows nothing for a while. It's been a while since I've owned the A58, but it was a big difference with the A65. I am pretty sure in the 8 FPS crop mode the A58 does the slide show. So it may have been the 5 FPS and/or 2.5 FPS modes.

I did use both the 5 FPS and 8 FPS modes of the A58 a lot. One rather annoying thing with the A58 is the buffer would often decrease to 3 or 4 frames instead of the full 6 frames. I actually called customer support about it. Resetting the camera is what they offer to fix the problem, and that does work. It seemed to have something to do with Lens Compensation. One or more of the Lens Compensation options uses some of buffer space (Distortion seems to be the one.) I think this is actually true of all the recent SLT models, but the buffer is so small on the A58 that the reduction is dramatic.

Edited by QuietOC - 28 August 2018 at 23:05
Sony A68 A77II A6000 A7II LA-EA3 LA-EA4 MC-11
Minolta Maxxum 600si
Pentax Q7 5-15 15-45/2.8
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Post Options Post Options   Quote sybersitizen Quote  Post ReplyReply Direct Link To This Post Posted: 28 August 2018 at 17:18
My question is not really how badly the A58 (or other models) handle such things. It's about how well you say the A68 handles them. Did I just miss this advance in the A68 (and presumably the A77II)? I don't recall reading about it.

My A55 and A77 behave like this:

Continuous Low: Blackout between frames, but what I do see of the displayed image is 'live'.
Continuous Hi: No blackout between frames, but I presume I'm seeing a 'slideshow' of the images already captured. Any other guess doesn't make sense.
10 or 12fps mode: No blackout between frames, but I know I'm seeing a 'slideshow' of the images already captured.

How does that differ from the A68?
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Post Options Post Options   Quote QuietOC Quote  Post ReplyReply Direct Link To This Post Posted: 28 August 2018 at 18:07
Syber,

I'll check the A68 behavior later today. I don't think I've ever used Continuous Lo, but maybe that is what I did when I saw the blackouts on the A58. Continuous Lo is only 2.5 FPS on the A58 and A68.

I did try to figure out how live the live-view was on the A65 at the various options. It seemed like the normal 8 FPS mode had less lag than the special 10 FPS mode. I wish I would have tested this more on the A57, but it did seem to behave like the A65.

Edit: yes, like the other SLTs the A68 has blackouts on Lo with what looks like non-laggy view between. FWIW: it doesn't seem to fill the buffer on Lo with L:24M Quality Fine using my U3 SD card even with all the Lens Compensation options enabled. I should use Lo more often.

Edited by QuietOC - 28 August 2018 at 23:21
Sony A68 A77II A6000 A7II LA-EA3 LA-EA4 MC-11
Minolta Maxxum 600si
Pentax Q7 5-15 15-45/2.8
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BearairCactus View Drop Down
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Post Options Post Options   Quote BearairCactus Quote  Post ReplyReply Direct Link To This Post Posted: 28 August 2018 at 18:45
Continuous low on the A68 gives a black out. Just tested it.
On the other two modes you get the "lag" as has been described.


Edited by BearairCactus - 28 August 2018 at 18:50
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LAbernethy View Drop Down
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Post Options Post Options   Quote LAbernethy Quote  Post ReplyReply Direct Link To This Post Posted: 28 August 2018 at 19:22
Is the review option turned to off?
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Post Options Post Options   Quote QuietOC Quote  Post ReplyReply Direct Link To This Post Posted: 28 August 2018 at 19:56
Originally posted by LAbernethy LAbernethy wrote:

Is the review option turned to off?

If that is to me, I always turn the auto review off.
Sony A68 A77II A6000 A7II LA-EA3 LA-EA4 MC-11
Minolta Maxxum 600si
Pentax Q7 5-15 15-45/2.8
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Post Options Post Options   Quote sybersitizen Quote  Post ReplyReply Direct Link To This Post Posted: 28 August 2018 at 21:27
Originally posted by QuietOC QuietOC wrote:

Originally posted by LAbernethy LAbernethy wrote:

Is the review option turned to off?

If that is to me, I always turn the auto review off.

I'm sure we all do.
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Post Options Post Options   Quote BearairCactus Quote  Post ReplyReply Direct Link To This Post Posted: 28 August 2018 at 21:30
Yes mate, always had the review function off.
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