Search found 72 matches

by zed
Thu Sep 28, 2023 1:34 pm
Forum: Equipment Discussions
Topic: Laowa Aurogon Super-Micro lens test and comparison (versus Mitutoyo etc.)
Replies: 36
Views: 6841

Re: Laowa Aurogon Super-Micro lens test and comparison (versus Mitutoyo etc.)

My apologies to Rik, Pau and Chris but after Laowa informed me that they had updated their design, I returned this set as it unfortunately didn't really make sense for me to spend more time with an obsolete lens kit. Sorry all. @Chris - the tubes are long and narrow with no access from the objective...
by zed
Sat Sep 23, 2023 6:07 am
Forum: Equipment Discussions
Topic: Laowa Aurogon Super-Micro lens test and comparison (versus Mitutoyo etc.)
Replies: 36
Views: 6841

Re: Laowa Aurogon Super-Micro lens test and comparison (versus Mitutoyo etc.)

Some further information from Laowa on the issue of stray light: "Since the set you are having is the very first branch of the demo set, the internal reflection issue has been solved with baffling for all the new set and products. I am sorry that the factory did not update us about this. I understan...
by zed
Fri Sep 15, 2023 3:45 am
Forum: Equipment Discussions
Topic: Laowa Aurogon Super-Micro lens test and comparison (versus Mitutoyo etc.)
Replies: 36
Views: 6841

Re: Laowa Aurogon Super-Micro lens test and comparison (versus Mitutoyo etc.)

Oh, that's a large caveat. Chromatic aberrations are an important source of unsharpness in real life, but these are not going to be revealed by tests using only a singe color. I would strongly recommend using a full-color testing workflow if the goal is to judge sharpness in typical full-color appl...
by zed
Thu Sep 14, 2023 5:09 pm
Forum: Equipment Discussions
Topic: Laowa Aurogon Super-Micro lens test and comparison (versus Mitutoyo etc.)
Replies: 36
Views: 6841

Re: Laowa Aurogon Super-Micro lens test and comparison (versus Mitutoyo etc.)

2. Best practice is to avoid stacking in tests with flat resolution charts. The main reason is that the stacking process may do sub-pixel shifting of the images in order to align various frames, and the associated interpolation can mess with the contrast of pixel level detail. The canonical example...
by zed
Thu Sep 14, 2023 8:23 am
Forum: Equipment Discussions
Topic: Laowa Aurogon Super-Micro lens test and comparison (versus Mitutoyo etc.)
Replies: 36
Views: 6841

Re: Laowa Aurogon Super-Micro lens test and comparison (versus Mitutoyo etc.)

One question: at this comparison "SunsetWing_NA_Comparison.jpg" the Laowa-0.5 pictures are softer than the Laowa-0.3. Shouldn't that be the other way round? Ideally this should be true - however the Aurogon does not handle stray light well at its maximum NA with the lower tubes (10-20x) and the sta...
by zed
Wed Sep 13, 2023 8:41 pm
Forum: Equipment Discussions
Topic: Laowa Aurogon Super-Micro lens test and comparison (versus Mitutoyo etc.)
Replies: 36
Views: 6841

Re: Laowa Aurogon Super-Micro lens test and comparison (versus Mitutoyo etc.)

Hi All, I am currently in the process of test driving this lens set - so please allow me to add my perspective. Below is a link to a preliminary series of test images that include figures comparing resolution test targets vs. Mitutoyo Plan APOs, image comparisons of multiple subjects with variations...
by zed
Tue Jul 18, 2023 12:05 pm
Forum: Equipment Discussions
Topic: Laowa Aurogon 10x-50x
Replies: 37
Views: 4095

Re: Laowa Aurogon 10x-50x

It's only 0.5NA at 50x. There are 4 different tube lenses, they give mag/na ratios of: 10x/0.3 (WD = 18.8mm) 20x/0.4 (WD = 10.3mm) 35x/0.45 (WD = 6.85mm) 50x/0.5 (WD = 5.56mm) If the APO corrections hold up and they are true Plan optics for FF cameras then these might be a great option vs. Mitutoyo....
by zed
Thu Nov 11, 2021 1:30 pm
Forum: Equipment Discussions
Topic: Experience with Mitutoyo 50x/0.75 HR?
Replies: 6
Views: 1047

Re: Experience with Mitutoyo 50x/0.75 HR?

Thank you Chris and Scarodactyl for your quick replies. I was silently hoping that the differences would be minor - but the images Chris shared were quite impressive. I hope you are OK with me sharing, Chris - but I assembled a quick figure showing a cropped region from each example image at 100% (t...
by zed
Thu Nov 11, 2021 9:50 am
Forum: Equipment Discussions
Topic: Experience with Mitutoyo 50x/0.75 HR?
Replies: 6
Views: 1047

Experience with Mitutoyo 50x/0.75 HR?

Hi All, I'm curious if others have tried this objective - it has a lot of great features, especially the working distance-to-NA ratio. I've not found another objective that has >4mm working distance with an NA above 0.7 with Plan APO level corrections. I'm currently using a 60x/0.7 ELWD BD M-Plan th...
by zed
Thu Sep 30, 2021 4:51 pm
Forum: General Discussion Forum and Community Announcements
Topic: A BIG Thank You to this Community - 2021 Nikon Small World
Replies: 4
Views: 1684

Re: A BIG Thank You to this Community - 2021 Nikon Small World

I guess I use Zerene so frequently that DMAP = depth map to me!

But you are correct, the depth map function equivalent in HF would be Method B.
by zed
Wed Sep 15, 2021 12:46 pm
Forum: General Discussion Forum and Community Announcements
Topic: A BIG Thank You to this Community - 2021 Nikon Small World
Replies: 4
Views: 1684

A BIG Thank You to this Community - 2021 Nikon Small World

https://photomacrography.net/forum/userpixcached/https%253A%252F%252Fphotos.smugmug.com%252FMicroscopy%252Fi-2ZHJxDj%252F0%252F7eaabd7d%252FXL%252F2021032960X_Trichome_Stomata-XL.jpg As many of you may have seen - my image of a live oak leaf took first place in the 2021 Nikon Small World competitio...
by zed
Sun Sep 05, 2021 7:37 am
Forum: Equipment Discussions
Topic: Cheap New Mitutoyo M Plan 5X
Replies: 7
Views: 1289

Re: Cheap New Mitutoyo M Plan 5X

I bought one from Lightglass as well - was factory sealed and works great! They were very responsive.
by zed
Tue Jul 13, 2021 3:02 pm
Forum: Equipment Discussions
Topic: Barlow VS Eyepiece
Replies: 7
Views: 1110

Re: Barlow VS Eyepiece

Apologies everyone - I totally misconstrued the original question. For whatever reason I did not equate the term 'Barlow' lens with a front lens on a stereo. :shock:

Image
by zed
Tue Jul 13, 2021 12:32 pm
Forum: Equipment Discussions
Topic: Barlow VS Eyepiece
Replies: 7
Views: 1110

Re: Barlow VS Eyepiece

A 2x barlowe/quxiliary lens increases resolution (and decreases working distance) allpwing mpre details to be made out. In contrast a higher power eyepiece increases magnification without any increase in resolution. A Barlow lens most certainly does not increase the resolution of a microscope. Reso...
by zed
Fri Apr 09, 2021 12:37 pm
Forum: Technical and Studio Photography -- Macro and Close-up
Topic: Sunset moth scales @29X
Replies: 13
Views: 2309

Re: Sunset moth scales @29X

That is a very brave (and cool) modification!

I have the non-BD version of this lens and it is almost impossible to get diffused reflected light to the sample unless it is perfectly flat. I have mostly given up on this lens in favor of a Nikon 60x/0.7 finite objective because of this.