@Pizzazz...I'm very interested in the lieberkuhn reflector for 35mm lens, and in the bellows. When will you decide to sell?

Also sent PM...Ray

I'm sure some of you are aware, but for those interested in an inexpensive bellows with precision focusing, one model of Novoflex's vintage bellows (Balmin/Balco/etc) has a fine-focus feature. This bellows type is made of bakelite (or similar) and has a coarse adjust which is available by loosening ...

I can also back Scarodactyl's comments on the underwhelming performance of the "standard" 50x, 0.45NA, 12.5mm WD objective. +1 on the 50/0.45 performance. I have done quite a bit of imaging of phonograph styli, and working distance is always a challenge for any off-axis shots. I have a B&L 25/0.31 ...

I think the MM objectives are part of the 210mm system, not 160mm, so the extension required for rated mag is 200mm from the sensor to the thread shoulder plane. At least that's what gives my 5x objective exactly 5x magnification.

Ray There is an emoji "HAND WITH INDEX AND MIDDLE FINGERS CROSSED": 🤞 See 129310 on this page: http://www.alanwood.net/unicode/supplemental-symbols-and-pictographs.html If the emoji is visible, it means that the recent forum upgrade allows us to use all sorts of Unicode characters. Alan Wood Cool, ...

Just read that they've decided to cancel the remaining Sunnyvale electronics swaps for rest of 2020. If the shutdown situation improves it might pick up again in March. That makes a full year of cancelations. When the swap picks up again in March (is there a crossing fingers emoticon?) I expect a hu...

When these controllers coupled with the superb THK rails KR15, 20 and 26 with quality 400 step motors you have, think this is the SOTA for stepper based focus rails. Probably true, but I got the sense that the OP was looking for a more plug and play solution like I was when I bought the mjkzz contr...

Seems I'm not using the lens to full potential on my lowly APS-C sensor! But maybe someday I'll graduate to FF, and it will still be useful. What surprised me the most was its control of colour aberrations at the edge. If you use shift-shift shooting, this increases the range of movement. I think t...

I use KR15, KR20, and KR26 with various stepper motors, mostly from Lin Engineering. I control the steppers with the mjkzz controller. It is quite easy to use, and inexpensive. Prior to using the mjkzz I used Helicon Remote via a USB-RS interface to a Trinamic controller IC. This system worked well ...

Seems I'm not using the lens to full potential on my lowly APS-C sensor! But maybe someday I'll graduate to FF, and it will still be useful.

A little while ago you said that it was not a matter of whether or not to wear masks, but for how long to wear them. For a moment we agreed, and I let out a sigh of relief. But now we are back to this. I've been very consistent with my position, Lou. I feel that wearing masks is important in order ...

There is no need for a US-wide mask mandate, since 90+% of the US has no major problem. It is such a small effort, and so sensible, and it seems to be the main thing that distinguishes successful and unsuccessful efforts. 90% of the country is not alright; the majority of states have higher numbers...

Your answer to any study that shows this is that the subjects were lying. I suppose sometimes they might be lying, but in the absence of more information, this looks very much like outcome-motivated reasoning. Nevertheless, I agree with you that we don't really know how important this is. The WHO a...

this means at least some percentage of folks would not be caught by temperature measurements but could still be contagious. Ray, as we've discussed above, we already knew (according to most experts) that many people are completely asymptomatic and also contagious, or pre-symptomatic and contagious....

All have given us demonstrably false and misleading narratives. I'm afraid you are right about most of that (I don't know about John Hopkins, but the rest yes). That's why it is so important to look at other countries and actually see what works and what doesn't. Earlier you said you don't care abo...