Search found 41 matches

by palea
Sun Nov 28, 2021 10:51 am
Forum: Macro and Micro Technique and Technical Discussions
Topic: Sharpness of microscopic photos at 10x?
Replies: 17
Views: 2846

Re: Sharpness of microscopic photos at 10x?

With respect, this is simply not true. Then it would be appropriate to retract or revise the posts you've made indicating a one stop difference between extension and coupled lenses over the past years. FAQ entries also merit updating. Since MN and (M + 1)N has been in place for some time and is in ...
by palea
Sun Nov 28, 2021 9:07 am
Forum: Macro and Micro Technique and Technical Discussions
Topic: Sharpness of microscopic photos at 10x?
Replies: 17
Views: 2846

Re: Sharpness of microscopic photos at 10x?

Thanks for the response. You're welcome. +1 on what Scarodactyl and Rik have said about the mismatch between trying to use an infinity objective with finite conjugates and changing to a 200 mm rear lens to match the objective's designed tube lens focal length. I'd also suggest testing with the pola...
by palea
Sat Nov 27, 2021 11:36 am
Forum: Macro and Micro Technique and Technical Discussions
Topic: Sharpness of microscopic photos at 10x?
Replies: 17
Views: 2846

Re: Sharpness of microscopic photos at 10x?

Hmm, a Plagiomnium ? This is definitely softer than what I get with similar species and either an Olympus MPlanFL 5x 0.15 around 5x or a UPlanFL 10x 0.3 around 10x before deconvolving diffraction from the higher effective apertures on a tighter pixel pitch than the Z9's. From the amount of chromatic...
by palea
Sun Jun 13, 2021 1:12 pm
Forum: Equipment Discussions
Topic: 1:1 isn't macro (enough) anymore!
Replies: 6
Views: 1095

Re: 1:1 isn't macro (enough) anymore!

Beatsy wrote:
Sat Jun 12, 2021 2:13 pm
Am I the only one?
Why I use μ43 instead of full frame or APS-C.
lothman wrote:
Sun Jun 13, 2021 10:54 am
with the high frame rate of the A1 you could do stacks out of an axial stroke of a makro slider
An easier way is autofocus bracketing, which I think Sony and Pentax are the only manufacturers not to support at this point.
by palea
Sat Jun 12, 2021 6:13 am
Forum: Equipment Discussions
Topic: 0/-/+ order for focus bracketing
Replies: 3
Views: 840

Re: 0/-/+ order for focus bracketing

Do other cameras have this feature also? Or is it unique to some models of Panasonic? It's common to Panasonic firmware and not a G9 specific thing. So also G85, G95, G100, GH5, GH5s, S5, S1, S1H, S1R, almost certainly the pending GH5 II, GH6, and presumably any further models. Offhand, I don't thi...
by palea
Wed Mar 03, 2021 7:41 am
Forum: Equipment Discussions
Topic: Stereo microscope comparison: Nikon SMZ vs Chinese clone
Replies: 4
Views: 1440

Re: Stereo microscope comparison: Nikon SMZ vs Chinese clone

Yes, this is great, thank you Scarodactyl! Given the tendency of low power compound microscope objectives towards short working distances and high costs along with the limited optical abilities of enlarging lenses and Raynox DCRs, I've been surprised by the lack of interest in common main objectives...
by palea
Wed Mar 25, 2020 9:34 am
Forum: Macro and Micro Technique and Technical Discussions
Topic: Sample density needed to resolve Rayleigh features
Replies: 40
Views: 12256

If we can make similar improvements in understanding sampling and image reconstruction, that would be superb! I don't see why it wouldn't be possible. However, the depth of field example mentioned gives me a question and a corollary which I think are relevant. As context, the only FAQ entry whose t...
by palea
Sat Mar 21, 2020 6:53 pm
Forum: Macro and Micro Technique and Technical Discussions
Topic: Sample density needed to resolve Rayleigh features
Replies: 40
Views: 12256

If you see something that I've messed up or seem to have a wrong understanding about, please let me know so we can get it fixed. Hi Rik, I think I'd like to suggest a different framing. Zerene gives you a thorough knowledge of alignment and focus stacking. Similar depth and nuance exists in most ot...
by palea
Sat Mar 14, 2020 9:23 am
Forum: Macro and Micro Technique and Technical Discussions
Topic: Sample density needed to resolve Rayleigh features
Replies: 40
Views: 12256

I suggest also reviewing earlier discussion in the thread and links starting at https://www.photomacrography.net/forum/viewtopic.php?t=33724 Any particular aspect of it? About half the thread is pretty solid, I think, but I chose not to bump it when I looked a couple years ago because attempting to...
by palea
Tue Mar 03, 2020 6:31 am
Forum: Macro and Micro Technique and Technical Discussions
Topic: Sample density needed to resolve Rayleigh features
Replies: 40
Views: 12256

So the number of pixels you desire based on Rik's example needs to be increased for Bayer sensors, up to a factor of 2 depending on the subject. 2sqrt(2) if the feature of interest's oriented along the diagonal of a grid of square pixels. And, as the sensor's two dimensional, the total number of pi...
by palea
Tue Dec 31, 2019 9:50 am
Forum: Equipment Discussions
Topic: Ca 2020 Continuous Lighting Panels?
Replies: 2
Views: 1121

Re: Ca 2020 Continuous Lighting Panels?

it just a matter of of looking at specs and reviews? If you can find a panel with photomacrographic specifications or reviews I'll be impressed. I'd suggest doing the math on the lux and LED spacing relative to your diffuser's transmission and shutter speed, effective aperture, and ISO requirements...
by palea
Fri Dec 27, 2019 9:59 am
Forum: Equipment Discussions
Topic: Panasonic Lumix cameras & Post Focus
Replies: 86
Views: 58402

Hi, I have some follow on questions about how post focus compares to focus bracketing. These are motivated by curiosity over tradeoffs which might favor one method or another in certain circumstances. It's mentioned earlier in this thread that brackets are displayed as they progress. Does this mean ...
by palea
Mon Dec 02, 2019 9:22 am
Forum: Equipment Discussions
Topic: Lomo 3.7x finite vs 120G
Replies: 75
Views: 6364

higher magnification than the simple infinite focal length multiplication due to the longer minimum extension Hi Ray, maybe I missed it in the back and forth, but how much extension are you adding? Presumably there's some back and forth to find an optimum? (As an aside, I arrived at Lou's method an...
by palea
Sun Oct 27, 2019 7:21 am
Forum: Equipment Discussions
Topic: Plustek 120 Medium Format Scanner Lens Test Results
Replies: 18
Views: 2829

It still needs some final editing for spelling errors etc, so let me know if you spot any errors, I'm sure there are a few. Looks good to me, other than the 135mm link at the end pointing to the 2018 test, which is perhaps expected. As usual, my ranking of the lenses is somewhat different than your...
by palea
Sat Oct 26, 2019 12:27 pm
Forum: Equipment Discussions
Topic: Plustek 120 Medium Format Scanner Lens Test Results
Replies: 18
Views: 2829

I need to make sure that I take a look at short focus with future testing! Cool! I'll look forward to the details when your 150mms as tube lenses review is out (not seeing them on your website as yet). My testing has been starting to move this way as well, though I've been thinking more in terms of...