Cunha wrote: ↑

Mon Feb 19, 2024 5:55 am

Am I missing some aspect here? .-)

yes on all modern lenses you have something like this. You should keep using such collars as a very solid option for your future. just throw it on your rail and everything is aligned.

Hi Chris, I think I'm going to order this. I like the diagonal quick release knob, rather than the version at the front, along the rail, which will be under the lens. This diagonal tightening/loosening knob seems more practical for my left hand. https://pt.aliexpress.com/item/1005005752472010.html?...

Using Musou Black as glue is ingenious! =D> Thanks, it is also fully reversible because Musou Black is resolved when moistured and also the lens cleans off easy and completely. I placed the cleaned coverslip on the lens and touched the rim with a toothpick dipped in Musou black. I centered the the ...

Maybe enough for the MP-E 65mm but not for other more demanding scenarios? I don't think you will be happy with this or either the Castel L with the MP-E. I you have a look in Rik's table for DOF you see a a value of 0.025mm for 5x magnification @f2.8. The rack and pinion drive of the Novoflex Cast...

I also look forward to revisiting this thread when my own 20X NA 0.75 arrives next week. :wink: just for reference, this is the lens I used: lens.jpg and this is how the 5mm diameter coverslip looks like when "glued" to the lens using Musou Black color: coverslip_glued.jpg coverslip_glued_b.jpg

In this thread you said those are the best scales you've ever seen. Well, that's with no coverslip. So if I had used a coverslip, result would've been just out of this world then :shock: https://www.photomacrography.net/forum/viewtopic.php?t=46776 yes I was spoiled by the crosslinks in the blue sca...

So my debunking thread got debunked? :| I'm afraid yes Well, I don't think so. Of coarse, it's always better to use the objective as intended (with coverslip in this case), but the point is that you can use a high-NA, coverslip-corrected objective with no coverslip with more than good result , outr...

I thought you were interested in the Sigma 105 not about pixelshift

now I "glued" the small coverslip with the black colour Musou-Black to the lens. And this seems to work excellent. Sony A7R5 /300 shots at 0,75 µm / Raxynox tube lens /2 LED panels continuous lightning / slabbed and edited Scales_glued_coverslip_overview.jpg crop_scales.jpg Links to fullsize image

Specially I am interested in using the Sigma 105mm Art here you can have a look on the test of my Sigma 105. A comparison of a 16x pixelshift reveals that at f2.8 the Sigma outresolves the sensor of a Sony A7R4/5 since the pixelshift shows much more details as a single frame :D http://www.photomacr...

Have you tried shooting 3D objects with this Chinese analogue of 5x? if yes, how is the quality? no I haven't, since I found it to weaker on flat subject I made no further tests. As far as I can judge, the pictures of the board taken by Laova seemed much worse to me than those taken with a Chinese ...

FotoChris wrote: ↑

Thu Feb 15, 2024 4:45 am

Hmm did you use the coverslip+water method for both images or "only" for the one with the Nikon objective?

for both lenses.

Pau wrote: ↑

Thu Feb 15, 2024 5:20 am

How did you get a so tiny coverslip? Did you cut it?

it seems interesting!

years ago somebody bought them, so they are (were) commercially available.

I put a drop of water on the waver and a cover slip. Camera again Sony A7rv, Raxnox tube lens, no further extension, Zerene pmax. Mitutoyo 20x 0.42: Mity_coverslip.jpg Nikon 20x 0.75 Nikon_coverslip.jpg so with a cover slip the Nikon shines :D and I doubt that can be achieved with additional spacing...

Very nice! As expected, the Nikon clearly outresolves the Mitty. OK but for the Nikon with NA 0.75 compared to Mitutoyo with NA 0.42 I hope for much more :( I hoped replacing a 50x NA0,55 with the 20x NA0.75 and wider field of view and even better resolution, but with the current setup that doesn't...

The longer FL the tube lens the bigger offset it takes to compensate for the lack of coverslip. In this case it was about 40mm. With a 150mm tube lens I found the sweet spot at about 20mm extra extension. Thanks this is excellent, so a helicoid extension tube is sufficient for evaluation. P.S:: due...