Search found 18360 matches

by rjlittlefield
Wed Jul 28, 2021 10:23 pm
Forum: Equipment Discussions
Topic: A7r4 pixel shift. Rather a resolution eye-opener
Replies: 27
Views: 1188

Re: A7r4 pixel shift. Rather a resolution eye-opener

I get a "404 page not found" error on the second one.

--Rik
by rjlittlefield
Tue Jul 27, 2021 12:11 pm
Forum: Equipment Discussions
Topic: 10X infinite objective help
Replies: 6
Views: 157

Re: 10X infinite objective help

A good fit for you might be Nikon CFI BE 10X NA 0.25 WD 6.7 (part number MRN70100). The relatively short working distance (6.7 mm) is usually no problem because the objective has a narrow conical tip that leaves plenty of room for light to get around it. The objective should cover full frame with no...
by rjlittlefield
Mon Jul 26, 2021 11:58 am
Forum: Equipment Discussions
Topic: Some 3D printed accessories for the Godox TT350 flash
Replies: 13
Views: 214

Re: Some 3D printed accessories for the Godox TT350 flash

The printer itself is a Creality CR-6SE, and is relatively affordable. At https://creality3d.shop/collections/3d-printer/products/creality3dcr-6-se-3d-printer , I'm seeing a list price of $399 for ship from US. Is that the right unit? If so, then I'm having a jaw-dropping moment about how cheap & g...
by rjlittlefield
Mon Jul 26, 2021 11:51 am
Forum: Photography Through the Microscope
Topic: Watermite
Replies: 9
Views: 121

Re: Watermite

Lovely -- I like simple solutions that work really well!

Am I correct in thinking that the polarizer is to cut specular reflections from the left side of the mite?

--Rik
by rjlittlefield
Mon Jul 26, 2021 9:42 am
Forum: Equipment Discussions
Topic: Some 3D printed accessories for the Godox TT350 flash
Replies: 13
Views: 214

Re: Some 3D printed accessories for the Godox TT350 flash

Rik, would you believe I was reading that exact post of yours earlier today :D Ah, well clearly you are tuned in to excellent sources -- or perhaps it was just a fortunate coincidence! :wink: In either case I'm glad the post was helpful. These 3D prints are inspiring. I look forward to more informa...
by rjlittlefield
Mon Jul 26, 2021 9:23 am
Forum: Photography Through the Microscope
Topic: Watermite
Replies: 9
Views: 121

Re: Watermite

Very nice! The illumination really is excellent. Is this conventional darkfield using a condenser, or did you do something special?

--Rik
by rjlittlefield
Sun Jul 25, 2021 12:59 pm
Forum: Equipment Discussions
Topic: Some 3D printed accessories for the Godox TT350 flash
Replies: 13
Views: 214

Re: Some 3D printed accessories for the Godox TT350 flash

so I haven't thought much about the physics behind it yet or optimising the designs for weight and strength etc. If you have some ideas let me know and I'll see if I can whip up some designs and print them. I have no ideas about your design per se. However, it does occur to me that you might learn ...
by rjlittlefield
Sun Jul 25, 2021 12:15 pm
Forum: Equipment Discussions
Topic: Coverslip thickness
Replies: 18
Views: 346

Re: Coverslip thickness

dhmiller wrote:
Sat Jul 24, 2021 9:37 am
I tried to find .17 online but I only see ".13mm - .17mm" and ".17 - .25," etc. So which might be best?
Look for No. 1.5 coverslips. www.tedpella.com lists quite a few models as 0.16 - 0.19 mm. That range would be fine for anything you're doing.

--Rik
by rjlittlefield
Tue Jul 20, 2021 1:40 pm
Forum: Macro and Micro Technique and Technical Discussions
Topic: DMap intermediate output - ZS
Replies: 3
Views: 147

Re: DMap intermediate output - ZS

Caching of DMap intermediate results was recently added to the beta, has not yet propagated to the full release. From https://zerenesystems.com/cms/stacker/softwaredownloads/currentbeta : DMap speedup: Options > Preferences > DMap Settings: “Cache DMap pass 1 info for faster work with multiple thres...
by rjlittlefield
Mon Jul 19, 2021 9:40 am
Forum: Equipment Discussions
Topic: Coverslip thickness
Replies: 18
Views: 346

Re: Coverslip thickness

Dennis, see the discussion at viewtopic.php?p=198514#198514 and in the surrounding thread.

--Rik
by rjlittlefield
Sat Jul 17, 2021 8:47 pm
Forum: Technical and Studio Photography -- Macro and Close-up
Topic: June Beetle eyes have a smoothly curved surface
Replies: 9
Views: 342

Re: June Beetle eyes have a smoothly curved surface

Thanks for the feedback, guys! I'm glad to hear that the stereo works for other people also. This figure from Nilsson’s text suggests nocturnal beetles may have a rather smooth cornea exterior surface. A feature of a “superposition” eye. This makes sense from an optical standpoint, since in a superp...
by rjlittlefield
Sat Jul 17, 2021 8:24 pm
Forum: Technical and Studio Photography -- Macro and Close-up
Topic: 180mm ED Nikkor 2.8 as tube lens?
Replies: 12
Views: 226

Re: 180mm ED Nikkor 2.8 as tube lens?

Lou Jost wrote:
Sat Jul 17, 2021 7:25 pm
I do use the 180 ED (non-IF), which has a great reputation especially in astrophotography. I think I have included it in one of my past tube lens tests on this forum, but I don't know where it is.
viewtopic.php?p=228350#p228350 ?

--Rik
by rjlittlefield
Sat Jul 17, 2021 8:20 pm
Forum: Equipment Discussions
Topic: Looking for a new monitor
Replies: 10
Views: 332

Re: Looking for a new monitor

Are you particularly attached to the concept of one monitor? I've become very fond of my two-monitor setup, each 4K, so giving me a total space of 7680 x 2160.

--Rik
by rjlittlefield
Sat Jul 17, 2021 4:52 pm
Forum: Technical and Studio Photography -- Macro and Close-up
Topic: Virginia Creeper Leafhoppers -- Erythroneura ziczac
Replies: 2
Views: 192

Re: Virginia Creeper Leafhoppers -- Erythroneura ziczac

Thanks, Mark. The game continues. Here is a photo from today, just before spraying again. In a single frame, I see one large nymph, two medium, two small, and some more eggs left to hatch. I think I'm losing. https://janrik.net/MiscSubj/2021/GrapeLeafhoppers_20210703/IMG_9917_small.jpg MP-E 65 on Ca...
by rjlittlefield
Sat Jul 17, 2021 3:12 pm
Forum: Technical and Studio Photography -- Macro and Close-up
Topic: 180mm ED Nikkor 2.8 as tube lens?
Replies: 12
Views: 226

Re: 180mm ED Nikkor 2.8 as tube lens?

I fully agree that the Mitutoyo M Plan Apo objectives are better than anything else in their price bracket. But they are definitely pricey. They are also relatively fragile so used units must be purchased with return rights and careful testing immediately after delivery. I do not know anybody who re...