When is St. Tanktup's Day ........
Sod it I'll celebrate it tonight

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The Kenko 1,5x Teleplus MC DG is a very poor TC.
The Kenko 1,4x MC4 DGX (non-SMC) is actually one of the best you can buy. I'm not sure if the current model is identical.

SEE:
http://www.traumflieger.de/objektivtest/open_test/telekonverter/overview.php

I can't read German but Bruce might be able to translate any interesting points.

Zentrum = centre. What does erw. zentrum mean ?
Rand = edge

Note all 2x are poor. Most 1.7x are good from my experience.

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What's the weight in practical objects such as pints or steins of beer

This Bavarian Barmaid will give you a hand if it's too heavy

https://media.licdn.com/mpr/mpr/p/4/005/073/08e/0414e61.jpg

A stein of beer weighs 2.3 kilograms
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The Z-1 and Z-1p had 1/250th flash sync. The MZ-S went back to 1/180th.
I suppose they thought no one was interested in 1/250th.

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You see commitment elsewhere I don't see much from Sony and it looks like they are abandoning a lot of excellent lenses brought out for their FF DSLR's by not continuing with new A mount FF cameras. Adapters aren't a suitable solution. The A99 is 4 years old.

For years Canon didn't have any decent WA lenses and Nikon used to still produce a lot of old glass. Unless they have changed very few WA lenses had any SR.

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Last time I checked (about 2 years ago) Global sales of DSLR lenses was equal to 160% of body sales so I would think the big money comes from the lens sales.

Everyone seems to think that better quality glass is required for FF. I wouldn't think that was true. As long as the edges are good the centre performance doesn't have to be exceptional, because FF doesn't need as much enlargement as APS-C which needs roughly 2.3x more enlargement.

It used to be the same with 35mm film. A Lubitel 6x6 with a plastic lens could easily equal the best of 35mm.

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As soon as I saw the Sunwayphoto link it confirmed what I said earlier it's a special tool for adjusting parts that are assembled similar to lenses.

They probably include them with all their stuff even if they aren't needed. I got one with a pano head along with another plainer tool. It's used on the centre as shown here. The alternative is find a coin that fits. It also adjusts the 1/4" and 3/8" bushes.

http://www.ebay.co.uk/itm/SUNWAYFOTO-IRC-64-Panoramic-Indexing-Rotator-Clamp-4-8...

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Is it for getting boy scouts out of horses hooves?

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It's the new 20p piece with David Cameron's head on it

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Looks like a special spannah for adjusting inner outer threads similar to a lens spannah.

The crop for APS-C is shown near the end of this video.
Good Luck using it

https://www.youtube.com/watch?v=Jb2muPC8ZFE

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