It's a hole!
Jan 10, 2021 18:15:29 #
Just messing about while testing my DIY automated focusing rail.
Hole is 1/8 inch in diameter (3.17mm) drilled in medium density fiberboard coated with Melamine(I think).
40 slices at 1/8mm per slice.
Hole is 1/8 inch in diameter (3.17mm) drilled in medium density fiberboard coated with Melamine(I think).
40 slices at 1/8mm per slice.
Jan 10, 2021 18:19:33 #
Nice shotJan 10, 2021 20:47:30 #
Jan 11, 2021 07:38:13 #
Interesting. I don't have a 'feel' for stacking yet. What happens when you do the same subject and set-up, but expand your 40 shots all the way to the visible bottom, stretched over another 3mm or so (doubled, my guess)? Does the oof band between each successive pair of the 40 shots become obvious? Will the observed dof that is obvious around the hole at the same depth (slice) become more obvious? The focus 'shut-off' in this original is very rapid at the maximum 'in-focus' depth. Seems like your hole is an excellent subject to explore, the fine grain of the pressed wood particles gives a nice 'real-life' field to compare at download plus magnification.
Jan 11, 2021 08:55:32 #
The common practice is to overlap the in focus area by 50% to insure that you don't get any out of focus bands.
What I do is estimate the size of the subject and decide, based on the aperture I'm using and experience, how many slices
I will need and what the distance each step needs to be. Since I'm able to make much smaller steps using my automated focusing rail
than I could manually, I'm still learning what I need to do at steps of 1/8mm and smaller. More overlap doesn't hurt but too little overlap will ruin a shot
so more is good :)
What I do is estimate the size of the subject and decide, based on the aperture I'm using and experience, how many slices
I will need and what the distance each step needs to be. Since I'm able to make much smaller steps using my automated focusing rail
than I could manually, I'm still learning what I need to do at steps of 1/8mm and smaller. More overlap doesn't hurt but too little overlap will ruin a shot
so more is good :)
Jan 11, 2021 08:58:36 #
Now, how many times have I seen photos of holes? Yes, just recalled some in the field of archology showing stone with drill holes machined 1000s of years too soon. But in our own photography rare.
Some things are difficult and this is a simple example that educates us, another is photographing white egg shells on white paper.
Some things are difficult and this is a simple example that educates us, another is photographing white egg shells on white paper.
Jan 11, 2021 09:06:42 #
I was looking for a test subject for my automated focusing rail. I'm working my way down to smaller steps 1/16mm etc.
The hole in in 4 X 6 inch piece of 3/4 inch MDF with Melamine on the outside that I use to place subjects on.
I noticed hole and said "why not" :)
The hole in in 4 X 6 inch piece of 3/4 inch MDF with Melamine on the outside that I use to place subjects on.
I noticed hole and said "why not" :)
Jan 11, 2021 13:29:12 #
I like it when people tell the "hole truth". I've seen many DIY automated focus rails and I am always impressed by those that have the skills and background to do so.
Jan 12, 2021 09:03:42 #
sippyjug104 wrote:
I like it when people tell the "hole truth". I've seen many DIY automated focus rails and I am always impressed by those that have the skills and background to do so.
Mine is fairly simple. I designed and 3D printed the part needed to connect a stepper motor to a manual focusing rail I already had.
I control the stepper motor using Arduino (micro controller software). I set up the software to communicate with an app on my phone using Bluetooth.
I just enter the number of shots I want and the distance to move the camera between each shot. Smallest step is 1/400mm, not that I will ever need one that small.
If you want to reply, then register here. Registration is free and your account is created instantly, so you can post right away.