ProfHankD

A 1:4 reduction from 1200DPI would give 4800DPI, not 7150DPI (which would be 3.6um pixels and 214MP 645 format) -- that math doesn't work either. I'm willing to believe a 140MP image came out of ...

That's a very incomplete description in that video... Anyway, some math. He claims it is 645 format with a 1200DPI scanner that he usually runs at 600DPI. 1200DPI would mean pixels are ...

No artifacts at all, including no vignetting beyond what the lens naturally does. It does that with no optics, i.e., no Fresnel being used to re-direct light. I one I have a big roll of is no ...

Looks very nice... Well, so far, the winner for rear projection I found was a plastic inkjet "paper" -- as described in my Instructable. However, it is very even and has very little texture, but it ...

Not really, because it would need to stick out a lot -- the back would be large, actually about the same size as the entire Lafodis. There's no realy advantage to doing that. I can replicate the ...

Neither digital imaging nor film -- nor even human eyes -- are guaranteed to see things as they actually are. Film is harder to manipulate, and it tends to require a significant conscious effort to ...

There are LOTS of fisheye lenses for FF, but they tend to be a little pricier. I think 3rd-party lensmakers see a bigger market for "fun" lenses on APS-C and MFT. For FF, it's a higher price point...

Well, now that I have Faboky , the Logetar 135mm f/2.2 lenses are more interesting because I get to use the complete 144x108mm (20% larger than 4x5") screen. The Logetar does cover it pretty ...

Well, my personal favorite is the AnyCubic Linear Plus, which is a $180 Kossel/Delta-type printer... that they don't make anymore. AnyCubic's new Kobra Go is quite different, but is currently $189 ...

It might be "a start," but this honestly looks more to me like what happens when Mythbusters shows something basically doesn't work and then scales things up to insane levels to try to make it...

I'm sure it detects something, but it certainly isn't calibrated and sounds very dependent on funky things not happening to the images in terms of processing of raws... which seems a very bad bet ...

Yes, and there are a wide selection of different size STLs posted. You have some flexibility because they all use a large screw thread to allow focusing. Yup. I was shocked that stacking 'em worked ...

That sounds really high, but there isn't a simple conversion formula for CPM to sieverts dose rate. Taks have had decades to decay, so it is possible that daughters of the original dopant are ...

I just spent about 30 minutes checking how hard it would be to build a hand-crank camera. The answer is not hard, but not worthwhile. Start with one of the little hand-crank USB chargers; there's a...

Interesting. They are pumping a rather loud 20KHz signal into the water to power this, but that is wireless power delivery, and 40M transmission range by backscatter is pretty impressive... then...

The real question is which particles does it measure? The materials most used in lenses are primarily alpha and beta, not gamma, emitters... although there are nastier things in their decay chains. ...

I've had a Burke & James 4x5 forever -- very similar to yours. However, I've also had a multitude of other cameras, both film and digital. My personal take on 4x5 is that it is a really great ...

The APS-C ergonomics already went through their big changes to get from the NEX-5 to the A6000, which is in a bit of a sweet spot well distinguished from the FF models except maybe the A7C. They...

I don't agree. Yeah, the changes from the A6000/A6500 onward have been somewhat incremental, but the full-frame line changes also have been fairly incremental through the II and III models -- at...

I don't think it was intended to allow for much movement. The usual rule of thumb is that Tessars aren't very good at covering a wide field. I think the guideline was to expect around 55-60 ...