Thanks all, right now, I have trouble access some websites, like dropbox, thingiverse, etc, as soon as I can I will put all info up for download! Made some more video about it, but I do not have access to youtube now.
I think the 80x80 half-mirror is the best choice. If too large, we will have working distance issue for some macro lens with short focal length, if too small, light coverage will be limited. If using auto focus macro lenses, it is as easy as taking a picture without worrying about lighting.
Anyways, will upload all info as soon as I can do it.
I drew this up yesterday. I posted a link to a google drive with the files but it seems the post got deleted, are we not allowed to post drive links? I am waiting on thingiverse to approve my upload and I will link that for who ever wants it
Awesome! I find that the deeper the bottom part is, the better, it will block lights from the openning reaching directly to the coin. To check this, you can take a look at the rim of coin where the inside should be darker all round. But if lights reaching coin directly, you will see some part of the rim is darker, other parts (directly opposite of openning) is brighter.
Quote: I posted a link to a google drive with the files but it seems the post got deleted, are we not allowed to post drive links?
To protect our users, links from new members are not allowed. Even for established members, Google Drive and other file-share links are discouraged, but can be allowed with prior approval.
Finally, able to get the file posted on GitHub. Important note: the file contains two components stacked together, need to either print them separately or separate them first and print them at different locations. Github link: https://github.com/mjkzz/DIY/blob/2.../CoinKit.3mf
Here is a video, sort of as how to assemble and use. In the video, I showed "stitching" multiple images to make a bigger one. I was using Canon 550D, a crop sensor camera, so I had to stitch 6 images. With full frame camera, 4 are probably enough. Microsoft ICE software is a free software, very useful. Key part of stitching operation is to have enough overlap and consistent exposure. I was moving the whole lighting setup by hand, try not to rotate it.
Sony A7R5 finally has focus bracketing and it is amazing, though it is still primitive, its 61MP sensor can help a lot. Check out zoomable image, it is about 35 mega pixles (5945x5945), stacked from 16 images using focus bracketing on the Sony A7R5. Zoom it up and take look at the details. Lens used is Sony 50mm f/2.8 macro lens
Of course, last image was done using coaxial cage. The cage is a bit tall, so I can not do 1:1, else, I might be able to stitch 4 of them to make a 100MP image. Now I regret not getting Sony 90mm macro that has longer working distance.
Weird that the coin has two dates. The main date of 1966, then a "19" and "68" incuse in the stars on either side of date. I'm sure there's an interesting story to go with those.
Contact me for photographic equipment or visit my home page at: http://macrocoins.com
Quote: Weird that the coin has two dates. The main date of 1966, then a "19" and "68" incuse in the stars on either side of date. I'm sure there's an interesting story to go with those.
Common with Spanish coins of the era.
The small date in the stars shows the actual year of mintage.
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Posted 12/18/2022 11:39 pm
