Search found 5985 matches

by Lou Jost
Fri Sep 15, 2017 6:40 pm
Forum: Equipment Discussions
Topic: The Perfect Test Target
Replies: 86
Views: 14116

Smokedaddy, no, it doesn't. Ray, that's a fascinating lens, looks more modern than the Ultra-Micro-Nikkors. If I still had money left I'd buy it, but I'm broke for at least the next half year. I am surprised there is no label for the wavelength. The newer UMNs usually had the mercury line name engra...
by Lou Jost
Fri Sep 15, 2017 5:19 pm
Forum: Macro and Micro Technique and Technical Discussions
Topic: Working distance & focus - Canon 100mm macro w/Kenko tub
Replies: 21
Views: 4338

It doesn't matter, as long as you can read the mm marks.
by Lou Jost
Fri Sep 15, 2017 5:06 pm
Forum: Macro and Micro Technique and Technical Discussions
Topic: Working distance & focus - Canon 100mm macro w/Kenko tub
Replies: 21
Views: 4338

You know you can just take a picture of a ruler.
by Lou Jost
Fri Sep 15, 2017 3:17 pm
Forum: Equipment Discussions
Topic: The Perfect Test Target
Replies: 86
Views: 14116

Here is a really good one; unlike the Zeiss lenses which are fairly old technology, this is from 2008 and uses UV light: http://www.ebay.com/itm/141-TAMARACK-SCIENTIFIC-5X-248NM-LENS-530-0801-/111126379871 I have one of these. Don't know if it will work or not, since there seems to be a gas port, as...
by Lou Jost
Fri Sep 15, 2017 3:09 pm
Forum: Equipment Discussions
Topic: The Perfect Test Target
Replies: 86
Views: 14116

These are hard to search for, since the owners don't always label them correctly. But there are several for sale now, not only on eBay but also in semiconductor surplus stores. Here is another: http://www.ebay.com/itm/Carl-Zeiss-Lens-S-planar-1-1-6-f-50mm-4360A-Nr-6205792-/282643030884?hash=item41ce...
by Lou Jost
Fri Sep 15, 2017 3:02 pm
Forum: Macro and Micro Technique and Technical Discussions
Topic: Working distance & focus - Canon 100mm macro w/Kenko tub
Replies: 21
Views: 4338

Nothing major, but the teleconverter is designed to provide an image at a certain distance from the flange, and this order respects that design constraint. Lenses on the other hand are usually more robust to changes in extension.
by Lou Jost
Fri Sep 15, 2017 1:41 pm
Forum: Macro and Micro Technique and Technical Discussions
Topic: Working distance & focus - Canon 100mm macro w/Kenko tub
Replies: 21
Views: 4338

Never tried to combine those... maybe I ought to test this combo.
I regularly use both in the field; if the prime lens is very good, this can give good results. Best order is lens + tube + TC + camera.
by Lou Jost
Fri Sep 15, 2017 1:20 pm
Forum: Equipment Discussions
Topic: The Perfect Test Target
Replies: 86
Views: 14116

Edit- Robert posted some good info while I was writing...I also recommend Marco's document. I might be interested in buying one of those cameras, smokedaddy, if you are ever interested in selling one. The most well-known of these lenses are the Ultra-Micro-Nikkor lenses, sometimes available on eBay ...
by Lou Jost
Fri Sep 15, 2017 12:31 pm
Forum: Equipment Discussions
Topic: The Perfect Test Target
Replies: 86
Views: 14116

Exactly. Even the older ones have better optics than anything else we have ever been discussing on these pages. I've been gathering some old ones lately. If one can accept the limitations of monochrome photography and short working distance, they may be pretty exciting. They do present some stacking...
by Lou Jost
Fri Sep 15, 2017 11:57 am
Forum: Equipment Discussions
Topic: The Perfect Test Target
Replies: 86
Views: 14116

Mike, have you ever played with the photolithography lenses that make these chips?
by Lou Jost
Fri Sep 15, 2017 7:18 am
Forum: Equipment Discussions
Topic: All-electronic shutters
Replies: 34
Views: 5617

Not supported according to sony and I have not tried it.
That's unfortunate. If Olympus can do it, why can't Sony?
by Lou Jost
Fri Sep 15, 2017 6:13 am
Forum: Macro and Micro Technique and Technical Discussions
Topic: Best gear for field stacking?
Replies: 11
Views: 4203

Banania, yes, that is the Olympus lens that works best for focus stacking in the field. It works very well if yo can hold still. In the field so far I have only done stacks up to m=1. It can do stacking when reversed with an adapter I made, but in this case the working distance is too small for anyt...
by Lou Jost
Fri Sep 15, 2017 6:02 am
Forum: Photography Through the Microscope
Topic: Butterfly wing taken in a slightly different way
Replies: 4
Views: 746

Very nice. What objective?
by Lou Jost
Fri Sep 15, 2017 5:54 am
Forum: Equipment Discussions
Topic: All-electronic shutters
Replies: 34
Views: 5617

hkv, what about flash support in this electronic shutter mode? That's where the A7 fails.
by Lou Jost
Thu Sep 14, 2017 3:10 pm
Forum: Equipment Discussions
Topic: Samyang 2/135 - failed tube lens but great otherwise!
Replies: 9
Views: 1395

If you can get the mount screws to screw out properly so that you can take the mount off before grinding the tab off, there seems to no risk. If you can't remove the mount, as happened to me, then yes, it is a tense operation!