Search found 1120 matches

by Ichthyophthirius
Wed Sep 23, 2020 6:02 pm
Forum: Equipment Discussions
Topic: Can I push the resolution of a 1:1 macro lens?
Replies: 23
Views: 4661

Re: Can I push the resolution of a 1:1 macro lens?

Hi Rik, I'm using a Canon 500D (APS-C; 15 MP; 4.68 µm pixel pitch). I haven't done an aperture series yet. I have tried out the EF 40mm f/2.8 for macro recently. I noticed that when I pushed it towards 1:1 (forward with extensions) and then even further towards 1.5:1 (reversed with extensions), I wo...
by Ichthyophthirius
Wed Sep 23, 2020 5:50 pm
Forum: Equipment Discussions
Topic: Lomo 1.7X projective photoeyepiece
Replies: 24
Views: 4182

Re: Lomo 1.7X projective photoeyepiece

I think a focal reducer has a lot of potential but I'm not sure how you'd design one. I previously used an old enlarger lens which worked quite well. But for this, I'm particularly thinking of a 0.7x focal reducer (Speedbooster; Lens Turbo etc .) I even bought one recently to test for this purpose ...
by Ichthyophthirius
Wed Sep 23, 2020 4:41 pm
Forum: Equipment Discussions
Topic: Lomo 1.7X projective photoeyepiece
Replies: 24
Views: 4182

Re: DSLR adaptation to Nikon AZ100 38mm Photoport

Well, anyway, I've had a backup plan. And then, another backup plan :D . Before I even considered LOMO PE 1.67x, the first option was to get AmScope DSLR adapter 2x or it's Chinese counterpart NDPL-1(2x), it's relatively cheap (~90$) and easy to adapt. The tests of such adapters was on prc68.com si...
by Ichthyophthirius
Wed Sep 23, 2020 4:28 pm
Forum: Equipment Discussions
Topic: Can I push the resolution of a 1:1 macro lens?
Replies: 23
Views: 4661

Can I push the resolution of a 1:1 macro lens?

Hi, I have a 150mm f/2.8 macro lens (Sigma APO EX DG IF HSM; last version before the OS). For insects, I would use it at f/8 and at its closest focus distance (1:1). My questions: Would I be able to see a little more detail resolved if I a) Pushed this lens past 1:1 with extension tubes or a telecon...
by Ichthyophthirius
Wed Sep 23, 2020 4:33 am
Forum: Equipment Discussions
Topic: DSLR adaptation to Nikon AZ100 38mm Photoport
Replies: 12
Views: 2661

Re: DSLR adaptation to Nikon AZ100 38mm Photoport

Hi Pau, That looks interesting. If the monotube is 0.6x, that will hopefully result in a nice final magnification for your APS-C camera. The CFI projective will likely work similarly to DIN projectives. It's unlikely that Nikon changed this when moving from CF PL to CFI projectives. The intermediate...
by Ichthyophthirius
Wed Sep 23, 2020 4:24 am
Forum: Equipment Discussions
Topic: DSLR adaptation to Nikon AZ100 38mm Photoport
Replies: 12
Views: 2661

Re: DSLR adaptation to Nikon AZ100 38mm Photoport

dolmadis wrote:
Wed Sep 23, 2020 3:54 am
So the bottom thread is C mount and the top thread?
Hi John,

I would have to dig it out but as it fits on the Nikon Coolpix filter thread, it is probably M28x0.75 (same as the Leitz Periplan 10x/18 eyepiece).

Regards, Ichty
by Ichthyophthirius
Wed Sep 23, 2020 2:59 am
Forum: Equipment Discussions
Topic: DSLR adaptation to Nikon AZ100 38mm Photoport
Replies: 12
Views: 2661

Re: DSLR adaptation to Nikon AZ100 38mm Photoport

Background: I got the AZ-TP DSC 0.6x monocular phototube for my slowly growing AZ100M macro/micro frankescope Its photoport inner diameter is 38mm and the only option shown at Nikon literature is with 1X C-mount adapter 11mm FN for small sensor Digital Sight Series cameras. The tube lens is placed ...
by Ichthyophthirius
Sun Sep 20, 2020 7:48 am
Forum: Equipment Discussions
Topic: "Disastrous" (completely unexpected!!) 100x oil immersion objective comparison
Replies: 38
Views: 5105

Re: "Disastrous" (completely unexpected!!) 100x oil immersion objective comparison

I don't really understand that technique. Maybe I'm overthinking it? So a drop or two of cleaning liquid on a piece of lens tissue, then stretch it and run it into the objective? Getting anything microscope related in Australia is a struggle, lens tissues included. I'm quite conservative with the u...
by Ichthyophthirius
Fri Sep 18, 2020 12:25 am
Forum: Equipment Discussions
Topic: "Disastrous" (completely unexpected!!) 100x oil immersion objective comparison
Replies: 38
Views: 5105

Re: "Disastrous" (completely unexpected!!) 100x oil immersion objective comparison

Silicone oil immersion objectives seem to have even better characteristics than water. Higher NA and greater DOF. I wonder how difficult, or rather annoying the oil is to clean up. Cleaning up immersion oil is a major headache, it also ruins the stickers on the slides. But only if you object is emb...
by Ichthyophthirius
Thu Sep 17, 2020 1:19 am
Forum: Equipment Discussions
Topic: "Disastrous" (completely unexpected!!) 100x oil immersion objective comparison
Replies: 38
Views: 5105

Re: "Disastrous" (completely unexpected!!) 100x oil immersion objective comparison

I'd also love to try out silicone oil immersion objectives, they are however expensive and the immersion oil is very expensive too, I was quoted $200 a bottle. You could try matching the RI by using a glycerol solution (51 % at 20C) although dispersion will probably be different between glycerol an...
by Ichthyophthirius
Wed Sep 16, 2020 3:36 pm
Forum: Macro and Micro Technique and Technical Discussions
Topic: A couple macro questions
Replies: 7
Views: 2301

Re: A couple macro questions

I'm in the market for a good macro lens, so I've been doing some research lately. I'll be using it more for insects than herps. Second, has anyone used a reverse mounted lens for macro work? Hi, Are the insects very mobile? There's a big difference between bugs that you can approach to within a few...
by Ichthyophthirius
Sun Sep 13, 2020 3:49 am
Forum: Equipment Discussions
Topic: "Disastrous" (completely unexpected!!) 100x oil immersion objective comparison
Replies: 38
Views: 5105

Re: Disastrous 100x oil immersion objective comparison

There's a multiple studies of this phenomenon in scientific literature, both theoretical and practical, which showed the fact that coverglass thickness won't matter on PSF of oil immersion objectives, as long as all conditions are optimal (oil immersion optical properties are highly influenced by e...
by Ichthyophthirius
Sat Sep 12, 2020 5:43 am
Forum: Equipment Discussions
Topic: "Disastrous" (completely unexpected!!) 100x oil immersion objective comparison
Replies: 38
Views: 5105

Re: Disastrous 100x oil immersion objective comparison

I don't think there's anything wrong with those crops. The Fl (semi-apo), while significantly better corrected than an achro, will still show color fringing in areas of extreme contrast as in this case. Even the Super-Apo is showing some mild fringing. The N is a plain achromat, so no wonder it is ...
by Ichthyophthirius
Fri Sep 11, 2020 4:02 pm
Forum: Equipment Discussions
Topic: "Disastrous" (completely unexpected!!) 100x oil immersion objective comparison
Replies: 38
Views: 5105

Re: Disastrous 100x oil immersion objective comparison

Hi, I'm not sure what to make of this. How can there be colour finging in the centre with the UPlanFL? If the Plan N has fringes like this in the centre and in focus, it is likely defective. Could there be oil inside (not uncommon for the Plan Ns)? I don't have it myself but maybe someone could post...
by Ichthyophthirius
Mon Sep 07, 2020 2:47 pm
Forum: Equipment Discussions
Topic: Reversed zoom lens technical questions
Replies: 9
Views: 1922

Re: Reversed zoom lens technical questions

I know chasing "better" is probably silly, Ultimately, you would get the best if you shoot with a large aperture (just stopped down far enough to suppress spherical aberration) and then do focus stacking, if your subject is suitable for stacking. I'm also interested in an answer to your other initi...