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A7r, A7r2 - and why I'm keeping both ...

pegelli

pegelli

Well-known member
k-hawinkler said:
Thanks Pieter, great question that I have been asked before.
Here is my answer:

A9iii Images

Some images from the A9iii - mostly at 120fps.Feels like an A1 on steroids - except resolution of course. Doesn't feel quite as solid as the A1 bo...
www.fredmiranda.com

I am not knowledgeable enough to authoritatively answer that question.
But could you please explain to me how you would deal with the situation described in the link above with video.
TIA.
Click to expand...
Well, I'm a complete NOOB on video and it was just a question out of interest, but the specs say the A9iii can shoot 120 fps 4Kvideo but only at a resolution of ~8,3 MP.
So if you crop as in the example in the Miranda post above the resolution is a lot lower vs. combining the cropped full resolution raws/jpg's into a GIF.

But the advantage of using video would be that you are not limited to 1,6 sec movies (192 frames at 120 fps) but can shoot much longer, but you would need a longer lens or get closer to avoid the crop otherwise your resolution probably drops too much.
 
k-hawinkler

k-hawinkler

Well-known member
pegelli said:
Well, I'm a complete NOOB on video and it was just a question out of interest, but the specs say the A9iii can shoot 120 fps 4Kvideo but only at a resolution of ~8,3 MP.
So if you crop as in the example in the Miranda post above the resolution is a lot lower vs. combining the cropped full resolution raws/jpg's into a GIF.

But the advantage of using video would be that you are not limited to 1,6 sec movies (192 frames at 120 fps) but can shoot much longer, but you would need a longer lens or get closer to avoid the crop otherwise your resolution probably drops too much.
Click to expand...
Thank you Pieter.

I think video and the GIF animation clips I have developed have both certain advantages for different use cases. Until about a week ago I had mainly used my A1 for the GIF animation. I think working with raw files of 24 or 50 MP resolution has image quality advantages relative to video.

I added the A9.3 for 2 reasons, namely image pre-capture and 120 FPS image shooting that the A1 lacks. Both features are essential in increasing the success rate of photographing hummingbirds and little song birds in flight. Here being limited to 1.6 seconds of 120 FPS shooting equating to 192 images in total is not a problem.

These 2 features have certainly increased my success rate significantly and allowed me to capture BIF images I could not get before.

Another aspect is that I can retroactively create GIF animation clips from image sequences that I shot in the past before I was thinking in those terms. Working of high IQ raw image stills allows me to work entirely within the framework of familiar still image processing apps, such as Photoshop, Capture One, DxO PureRAW, and DxO PhotoLab. Especially use of DxO PR4 can clean up high ISO noise images very nicely.

So in addition to the reasons you mentioned I am convinced my chosen approach is the better way for the intended photographic niche, at least for me.

Pieter, thank you again for starting this conversation and helping me sort the reasons for choosing different techniques for different areas, you know as they say, horses for courses.

Thank you.
 
k-hawinkler

k-hawinkler

Well-known member
WOW! It turns out the A9.3 is a much more interesting camera than I thought it would be. :D

When I shot this deer



I noticed how smooth the GIF animation clip was without aligning the images first in order to eliminate the unsteadiness with which the camera was held during shooting.

Next I have this sample of doves sitting or landing in an Apricot tree.



Please note the violent shaking of the tree branches after the dove has landed.
Why is that?

And now the Rosetta Stone GIF animation clip explaining this A9.3 feature.
This image sequence was shot when it was very windy.



Please note the clip starts out very smoothly, intermittently the branches are pretty vigorously blown around, and the clip ends very smoothly again.

It turns out the at the beginning and ending of the clip images were shot at 120 FPS, while in between the images were shot at a rate of 6 FPS as the camera had filled up its buffer of 192 images.

My take on this behavior is simply that motions, either in the environment to shakiness of hand holding the camera of order 1/10 of a second are too long to be noticed at an order of magnitude shorter time scale that the A9.3 can operate on when it has not run out of buffer space.

However at a shooting speed of 6 FPS this time scale is comparable to human reaction times or slow motions in the environment.

There are 2 kinds of motion blur, namely subject or camera motion. In the last clip there is only subject motion as camera motion has already been eliminated through image alignment.

I am having a blast with this camera!!! :)
 
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k-hawinkler

k-hawinkler

Well-known member
GIF Animation covers 72 Frames at 120 FPS => 0.6 s Event.



Sony ILCE-9M3 + FE 400mm F2.8 GM OSS + 1.4X TC @ 560 mm, f/4, 1/4000 s, ISO 2500.

The 24 MP images are un-cropped and scaled down for web use with max length of 1200 pixel.
In Photoshop the full size images can be animated. Is this like shooting video?
I don’t think so from an image quality point of view.
 
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k-hawinkler

k-hawinkler

Well-known member
A little experiment.

This GIF includes only the first and last of 109 consecutive frames.
The images are aligned but otherwise not cropped.
Their sizes are 5975x3953, so slightly cropped from 6000x4000.



Sony ILCE-9M3 + FE 400mm F2.8 GM OSS + 1.4X TC @ 560 mm, f/4, 1/4000 s, ISO 640.

I wonder what the image quality is after going through Smugmug and this website?
Double clicking should get to full size display.
 
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