Tag: focus bracketing

Longhorn Beetle Macro Focus Stack

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So you take the Sony A7IV camera with the latest firmware update and you attach the Sony 90mm f/2.8 Macro G Lens and set the camera for focus bracketing using the small interval focus change and a hundred exposures with an f/8 aperture and ISO 100 quality and you get 100 files that look this bad:

Then you put the 100 files through a photo editor to get the exposure just right and process them in another piece of software that combines them into a focus stack and get this:

And if you crop that stack photo you’ll find quite a lot of detail:

Admittedly, this isn’t the loveliest insect photo on record but you have to admit it has a lot of detail.

Calibrating a Focus Bracket with the Sony 90mm Macro Lens on the A7 IV

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TomD brought up a lot of good points about the limitations and vagaries of focus stacking so I tried to get a better handle on the mechanics of the settings used.

And when in need of a handy dandy close up subject I hauled out my extremely dead tarantula spider.  He has the benefit of being a rather large macro subject.  So I arranged the camera on a tripod at the minimum focal distance and set the bracket spacing to 4 out of 10 and selected 125 frames.  After the end I measured the length of the spider that was in focus in the bracket.  It came to about 2.5 inches.  Now this is a ballpark because there was an angle to the camera.  but this gives a decent idea of how many shots are needed to cover a depth of field.

Here is the first bracket frame

Here’s the last (125th) frame

Here is the stacked composite

And finally here is a photo taken from the same distance at a very small aperture (f\18) as a comparison.

Now this stack took 50 minutes to crank out on my laptop.  Is it worth the time and effort?  I guess that’s a personal choice.  But I’m kind of enjoying playing around with a new technique.  And that’s probably the nerd in me showing through.

 

Update:

TomD commented:

As a lifelong certified arachnophobe, 2.5” inches is entirely too big (by at least an order of magnitude) for a live spider to be.

Thanks for the experiment! Enlightening!

Even with 4 steps/per frame x 125 frames, or 500 steps, it still didn’t get the abdomen. So 500 steps only covered around 1.75”?

That’s extremely unintuitive and approaching unusable.

As I said in an earlier post, the software that I played with at the camera club would have the entire object with 8-10 exposures.

Maybe that’s more a function of the lens than the software. I’ve done a lot of macro work using several lenses and noticed that macro lenses with a very close focus all have a razor thin usable depth of field. I wonder what would happen if you took a good prime lens in the 85+mm range, moved it back and tried the same experiment at something like f8?

You would have to crop in to get the same image size but I’ve noticed that ou A7IV’s can be cropped quite a ways and still have great IQ’s (image quality).

Using the setup specs of your experiment, I’d say that the upper dof limit is in the inch range.

photog replied:

Tom, I’m going to play around with this function.  I want to see what I can do with it.  It seems like an interesting tool that I might find some good applications for.  But I can see that it might not have any compelling uses for most people.

Sony A7 IV Focus Bracketing Test – 16NOV2024

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Welcome to the further adventures of me playing around with the newly added focus bracketing function on my Sony A7IV camera.  Although I was using the Sony 90mm macro lens this isn’t a macro bracket.  I set up a few small statues in a location that caught the late afternoon light and ran a hundred shots with a medium setting on the focus change.  I’ve attached the first file (1) and the last file (100) followed by the merged product.

(1)

 

(100)

 

merged product

 

Now this isn’t all that an exciting test.  Afterwards I though I probably should have included a shot at a very small aperture like F8 or F16 as a comparison of what can be done the old fashioned way without the software magic.  But I didn’t think of that before.

Anyway, just another test as I play around with my fun new toy.

Focus Bracketing Inside the Sony A7 IV – Part 1

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Well, I couldn’t resist. I went on Sony’s website and found the pages with the firmware update (4.00). But upon reading the instructions I found out that since my firmware was at version 1.01, I had to first update my camera to version 1.05 before updating to version 4.00. The warning said that if I went straight to 4.00 it would cause an error and then I wouldn’t be able to fix the problem. Well, the camera gods are a jealous bunch and defying them is very unwise so along with many a grumble and even a few mumbles I went through the procedure twice.
1.01 to 1.05
1.05 to 4.00
And what do you know? It really worked. The drive menu had new options that included focus bracketing. After following the instructions from a YouTube video, I was able to quickly and easily run a quick bracket on a preserved tarantula spider specimen and send it through my focus stacking program (Affinity Photo) and, voila, edge to edge sharpness.

Now this was just a quick test. I had a kid’s party starting and barely got the files stacked before I had to go referee grandkids for Camera Girl. But it was definitely a proof of concept and I can see how this will work for even some field shots. Definitely usable for macro shots of plants like mushrooms and such and even for resting or sedate creatures like resting dragonflies and such. Of course, butterflies are out of the question. But a little testing is bound to bring up other applications.
So, all in all, this is an amazing surprise from Sony. Kudos to them for hearing my cries in the wilderness. Bravo, gentlemen, bravo.

Yes Virginia, There is a Santa Claus. But His Name is Sony!

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At this point I considered attaching a video of the Hallelujah Chorus of Handel’s Messiah.  I had been waiting and hoping and praying that Sony would add focus bracketing to my Sony A7 IV camera by a firmware update but had more or less given up.

They did it!  Well, they made the update but I haven’t updated my camera yet.

But I watched the video below and did a quick jig around my house and am now calming down enough to type this post.

Ah hell, let’s add the Hallelujahs!

TomD replied:

Really!!??

I’ve been wanting focus bracketing for years! Years ago, FB was a relatively expensive windows or apple program and you had to shoot with the camera tethered to a computer. What a PIA.

I’m gonna update right now.

It can immediately help with a number of different types of shots I do. Aircraft in a museum for example. Museums are crowded with a constant problem of subject isolation. Far enough out to get the entire plane in the shot and there is a LOT of stuff competing for attention. Close enough with a wide angle and there is the depth of field problem.

photog replied:

I had to do two updates.  First I had to go from version 1.01 to 1.05.  Then 1.05 to 4.00.  But it worked.  I’ll load up the trial macro focus bracket soon.  It’s much easier than the damn tether.