Sinar Norma spirit level holders

[Daniel Unkefer]

I always used original replacement levels directly from Sinar. Larry in the parts department always knew what I wanted; they had a stash of original Norma parts for quite a while. I have a few extras now and I'm keeping them.

https://www.ebay.com/itm/Original-Le...ss!43068!US!-1

These look legit to me; the later F and P ones had a white plastic base. Do what you want but if I needed a few I'd grab these.

[B.S.Kumar]

I've used Sinar cameras for my commercial architectural photography. Rather than relying on the built-in levels, which aren't very precise, I align the grid on the screen with building lines, and double check with a Diamond Ebisu card level. https://www.largeformatphotography.i...n-bubble-level

Kumar

[Drew Wiley]

Well, if the film sits in the holder precisely square (which it rarely does), and if the gridded groundglass is perfectly centered relative to all sides (also unlikely). Some amount of post-correction for vertical is inevitable. Some of you might have been following all the fuss in San Francisco concerning its newest, most expensive, and significantly highest skyscraper, which is sinking on one side, and is already eighteen inches out of plumb. That's enough to make a marble roll across a hardwood floor on its own. But lawyers relish the fact.

[Jac@stafford.net]

is already eighteen inches out of plumb.

That's something Mother Nature will take care of. Earthquake equity.

[Drew Wiley]

Well, everyone is blaming everyone else at this point. But I already know the winner - the lawyers, as always. It seems that an adjacent project allowed some of their own underlying stuff (not exactly either soil or rock in that downtown area) to ooze out into their construction void, and hence the Leaning Tower of Pizza served with SF Espresso. A friend of mine specializes in local history books and digitally cleans up a lot of old photographs. Most people don't know it, but a far worse quake than the 1906 one transpired on this side of the Bay in the 1870's, which he dedicates one book to. But due to the smaller population at that time, it is less remembered. It was on the Hayward Fault (a ten minute walk uphill from me), rather than the San Andreas fault. But it actually liquified almost the whole of downtown SF, which even then was largely built on landfill into the Bay. After that, building standards were enforced, especially regarding collapsing brick chimneys. What caused most of the damage later in '06 was the fire after the quake. Today, high-rises there rely on huge subterranean pumped structural concrete T-bases, like giant underground feet. But the quality of the rock is so-so. It's basically partially consolidated Pliocene mudstone that can potentially turn back to mud. With all my geology training, I went out of my way to buy property in a neighborhood underlain by granite rock that an earthquake wave rapidly passes through. The landfill developments shake like Jello. There are official detailed USGS neighborhood maps showing all the different soil condition. They're accessible to anyone; but the Realtors are the last people on earth that want anyone to know about them. It's really not that difficult, however. You just have to look at how frequently a particular street has been patched for severed water or sewer lines. In the fault and "slider" zones, it's obvious.

[Dave Dawson]

I have just taken delivery of the bubbles from Germany that are on fleabay and they are the correct size, fast delivery and are the fraction of the price of the official Sinar ones. SORTED.

Cheers Dave
ps. Still looking for a plastic holder