Search found 1125 matches

by Ichthyophthirius
Sat Mar 06, 2021 12:39 pm
Forum: Equipment Discussions
Topic: Looking for serial numbers: Laowa 100mm 2x EF automatic with RF compatibility
Replies: 0
Views: 39

Looking for serial numbers: Laowa 100mm 2x EF automatic with RF compatibility

Hi, As I mentioned in another thread, there are examples of the Laowa 100mm Macro 2x f2.8 EF version (automatic aperture) that are not fully compatible with Canon RF mount cameras. Although they are lenses for full frame sensor, when mounted to a Canon Rx, they force the camera into crop mode (1.6x)...
by Ichthyophthirius
Sat Mar 06, 2021 12:25 pm
Forum: Equipment Discussions
Topic: Olympus U TLU tube lens vs SWTR-2 Superwide Head
Replies: 9
Views: 168

Re: Olympus U TLU tube lens vs SWTR-2 Superwide Head

Ah, I see. So that only affects the corners and the sides are much better? Maybe then it's just a spec issue? Does Olympus say anything about the expected sensor size on the U-TLU? Maybe it's just enough for m4/3, their own cameras. Then it would make sense that the SW head covers a much wider area ...
by Ichthyophthirius
Sat Mar 06, 2021 1:47 am
Forum: Equipment Discussions
Topic: Olympus U TLU tube lens vs SWTR-2 Superwide Head
Replies: 9
Views: 168

Re: Olympus U TLU tube lens vs SWTR-2 Superwide Head

The scope came with an analyzer slider, and I put a simple film polarizer over the field lens. I took photos with the analyzer in and out. Hi, Did you take the polariser over the field lens out as well? Using polarised light in brightfield can cause problems via internal refections in the trinocula...
by Ichthyophthirius
Sun Feb 28, 2021 1:08 pm
Forum: Beginners Macro
Topic: Macro gear for a beginner?
Replies: 7
Views: 3881

Re: Macro gear for a beginner?

Hi, It depends a lot on the type of subject (static or fast-moving) and on the reproduction ratio (0.5x - 1x you have many options; higher than 1x is more demanding on the equipment and technical skill and requires a lot of practice). Personally, I have used the following: 1) Canon EF-S 24mm f2.8 (a...
by Ichthyophthirius
Sun Feb 28, 2021 4:01 am
Forum: Equipment Discussions
Topic: This Just Seems Strange
Replies: 12
Views: 356

Re: This Just Seems Strange

In this case, with a US seller listing 9400+ items, maybe it's just a lack of price research by the seller? They are selling such a potpourri of stuff. Between the "best offer" option, low postage costs, no need for a credit card, no new account, and no restocking fees, it might even be easier to bu...
by Ichthyophthirius
Fri Feb 26, 2021 2:30 am
Forum: Equipment Discussions
Topic: Nikon CFN Fluor / Planapo 100 160/0.17
Replies: 32
Views: 673

Re: Nikon CFN Fluor / Planapo 100 160/0.17

viktor j nilsson wrote:
Thu Feb 25, 2021 10:03 pm
It's the only quantitative measurements I've been able to find. Would love to see more data like it.
Here we go :wink: Charles linked these snippets on his website:

https://krebsmicro.com/forumpix/CDM5.jpg
https://krebsmicro.com/forumpix/CDM4.jpg
by Ichthyophthirius
Wed Feb 24, 2021 9:55 am
Forum: Macro and Micro Technique and Technical Discussions
Topic: What's in the name: filter puzzles
Replies: 4
Views: 1502

Re: What's in the name: filter puzzles

Hi, I suspect the Schott glass names are chronological. They have a 150+ year history, it would be logical to stick to 1 name = 1 glass rather than constantly renaming them according to their property lineup. Apart from that, Schott: UG: Black and blue glasses, UV transmitting BG: Blue, blue-green, ...
by Ichthyophthirius
Mon Feb 22, 2021 2:52 pm
Forum: Equipment Discussions
Topic: Does anyone have the Laowa 100mm x2 macro lens?
Replies: 20
Views: 3522

Re: Does anyone have the Laowa 100mm x2 macro lens?

The copy I had had thin patches of grease but not a thick layer.

You're right, it should be used with the Laowa front filter. Otherwise, it will collect lots of dust sticking to the grease film.
by Ichthyophthirius
Sat Feb 13, 2021 4:43 am
Forum: Equipment Discussions
Topic: Laowa 2x problem: forced crop mode on RF mount
Replies: 2
Views: 326

Re: Laowa 2x problem: forced crop mode on RF mount

klevin wrote:
Fri Feb 12, 2021 1:32 pm
Is crop so bad?
{-( Unacceptable :D But in all seriousness, crop mode is 10 MP on the Canon RP. That's not using the lens to it's full potential, as it is supposedly quite good on full frame.
by Ichthyophthirius
Sat Feb 13, 2021 4:04 am
Forum: Equipment Discussions
Topic: Stereo Zoom Microscope - What to buy?
Replies: 11
Views: 775

Re: Stereo Zoom Microscope - What to buy?

Hi Owen, Thank you for the clarification. I think the GXM is a none-starter. The magnification range you get is between 1x - 4.5x. At the higher end, these stereo microscopes optics are usually not very good; so the usable range is maybe 1x - 3x. There are many other affordable and superior optics a...
by Ichthyophthirius
Fri Feb 12, 2021 12:47 pm
Forum: Equipment Discussions
Topic: Laowa 2x problem: forced crop mode on RF mount
Replies: 2
Views: 326

Laowa 2x problem: forced crop mode on RF mount

Hi, I'm testing a Laowa 2x macro lens (EF version with automatic aperture) on my Canon RP camera (corrected through an automatic EF-RF adapter). The lens enforces 1.6x crop mode on the RP, in the same way that EF-S lenses can only be used in crop mode on this full frame camera. I have gathered from ...
by Ichthyophthirius
Thu Feb 11, 2021 12:59 pm
Forum: Equipment Discussions
Topic: Stereo Zoom Microscope - What to buy?
Replies: 11
Views: 775

Re: Stereo Zoom Microscope - What to buy?

Hi Owen, What's been you experience with stacking so far? In broad terms, stereo microscopes are not ideal for stacking because of the inclined optical axis (reduces image quality and stifts the image during stacking). Alternative methods (low magnification: macro lens + focus bracketting; higher ma...
by Ichthyophthirius
Wed Feb 10, 2021 10:47 am
Forum: Equipment Discussions
Topic: How to achieve Kohler with an Orthoplan
Replies: 5
Views: 428

Re: How to achieve Kohler with an Orthoplan

Hi David,

I agree; just post a few images of your setup. Something stange is going on as that should work well (with an NA 0.9 condenser front lens).

Do you have any other Leitz condeners that can serve as a reference?

Regards, Ichty
by Ichthyophthirius
Wed Feb 10, 2021 4:22 am
Forum: Equipment Discussions
Topic: Cleanest microscope slides for D/F microscopy
Replies: 10
Views: 1815

Re: Cleanest microscope slides for D/F microscopy

best technique for cleaning microscope slides for spotless Dark Field imaging? Hi, For cleaning at home or in a lab? Some techniques are too dangerous to do without the necessary knowledge and PPE, but there are alternatives for doing it at home. Basically, mild alkali or acid + ultrasonic bath str...
by Ichthyophthirius
Sat Feb 06, 2021 7:42 pm
Forum: Equipment Discussions
Topic: My setup - need some lighting advice
Replies: 18
Views: 1548

Re: My setup - need some lighting advice

Someone in the forum linked to these DIY Bauersfeld light domes recently: https://journals.plos.org/plosone/artic ... ne.0153426

"A Scalable and Modular Dome Illumination System for Scientific Microphotography on a Budget."