Building A Professional Grade Shutter Tester

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FM2

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I used the parts from the BOM file (Rev 3), rather than the WIKI (Rev 4). In that case, resistors locations for R1-R4 printed on the PC board would be:
R1 = 2k
R2 = 2.2k
R3 = 4.7K
R4 = 4.7K

C1 = 220uf
C2 = 470uf

View attachment 346093
Resistor
Yes, that's true of course. However, the wiki does not state what resistor belongs to R1, R2, R3 or R4. That's why I went with the *.csv file and went with the parts stated there.
 
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ic-racer

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Keep posting updates of your builds here. This thread can be the substitute for the lost "Discussion" forum on GitHub.
 
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I wasn’t sure either, the one I got from Mouser was smaller.
I made it fit with blobs of solder that you can see in the picture.
 

aconbere

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Heh, feels like I'm getting close now.

But the screen reads:
"
amera Tester
Version
"

I'm going to assume that this is likely because I just ran avrdude directly against the nano and didn't use a second device as the programmer. So ... I'll work on that for now, but curious if anyone else has seen this.

IMG_2623.jpeg
 
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I made a programmer out of an extra Nano clone. The programmer is on the right and it is programming the board on the left.
Below shows the screen that should come up if the board was flashed correctly.
programmer.jpeg
DSC_0030.JPG
 
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ic-racer

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Use the Arduino IDE app to load the programming software on the programmer board.
Then (with a desktop iMac) I used the "Terminal" program to run Avrdude.

The piece of yellow paper has diagrammed the connections to make the programming board. I added the capacitor and resistor per recommendation I found on the internet:

schematic copy.jpg
 
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Like many projects, some things never are really done. I still need to make my flash synch cable.
 

FM2

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I got a calibration question. I don't have a lightmeter and therefore I looked for other ways to calibrate the light source. What I do have is a xrite i1 Display Pro monitor calibration device that can measure cd/m2. I switchted to K12.5 in settings and converted the EV values to cd/m2: EV13=1024cd/m2, EV 12=512cd/m2 etc. I adjusted the potentiometer of the power source until I had a linear match (currently11.6V). Is this a proper way to do it in lieu of a lightmeter?
 
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Math looks good.

The k12.5 meter I used to calibrate mine came with a conversion table that gave EV13 as 1000 cd/m2 and EV12 as 510 cd/m2.
 
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vandergus

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Finally got around to building my light unit. To add to LED question, here's what I bought.

Cree XHP70.2 GEN2 High Power LED in Warm White (3000-3500K), 12 V, on the 20mm circuit board.


I used the Falken brand diffuser linked by ic-racer earlier in the thread. I ended up driving it somewhere between 11.5 and 11.9 V, can't remember the exact value. I don't have a dedicated light meter so I had to go with the law of averages and used a handful of trustworthy cameras that I had on the shelf. The calibration seems good but it isn't perfectly linear over the entire range. EV16 is maybe 1/3 to 1/2 stop too dim.

Excited to finally have such a capable camera tester on my bench, though! It really does make everything easier.

Edit: Photo of my build

DSCF6011-2.jpg
 
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Wow, looks fantastic. I like the white printing.

Some things that bother me on mine is my neck hurts looking into the viewfinder at desk level. So I'm thinking of making a stand to bring it up to eye level.
Also, the trim ring around the display cuts off the top part of the display to my view from desk level (horizontal build).

This is Sover Wong's setup. He has the tester up on a stand and there is a little shelf on which the camera can sit.

90a441_68b6ba8f96494524a7e1aad7290609c3~mv2.jpg
 
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The calibration seems good but it isn't perfectly linear over the entire range. EV16 is maybe 1/3 to 1/2 stop too dim.

After looking at the user's manual for a Kyoritsu tester, I see the "Film Camera Tester" has copied the same basic setup. One thing not copied is a way to adjust the linearity of the EV scale based on one's chosen LED and reference meter.

The Kyoritsu has 4 trimmers to adjust EV6,9,12 and 15 individually, whereas "Film Camera Tester" has the intensity values from EV6-16 hard coded.
With both devices, there is no getting around the fact the color temp of the lamp changes as the EV value changes. So one needs to adjust accordingly to match sensitivity of the meter's cell.

One thought would be to have a table embedded in the "Settings" file that the user could alter to adjust linearity or non-linearity of the light source to match one's 'standard' meter.
 

vandergus

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I know what you mean about the having to stoop down to look through the viewfinder. I happen to have an adjustable desk and when I put it in standing position, I can sit in a chair and be at about the right level for easy viewing. It's pretty workable.

It is a bit of a shame that the light source calibration isn't more adjustable. Especially since the whole thing is essentially built around a knock off LED with no well defined specs (a truly mystifying decision, imo). It really needs to be more flexible. But I can't be too critical because, taken all together, it's really a wonderful project.
 

Twotone

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Evening all,

Seems I'm pretty late to the party with this but I'm planning on taking on this build. I will say though as a precursor, my soldering is god-awful, and generally electronics aren't my strong point.

I'm likely going to need some support from a friend who is an electrical engineer but we'll see how it goes.

I greatly appreciate your updates and observations OP, as do I appreciate the comments from others who have taken this on, I'll certainly be seeking some guidance at some point from you all.

I'm planning to start ordering bits in the next few days, and then inevitably realise I'm missed a load of stuff.

Anyway - I imagine the next post on this thread will also be from me.. 🤐

Thanks,
TT
 
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