Search found 1101 matches

by Ichthyophthirius
Sat Oct 24, 2020 6:56 am
Forum: Equipment Discussions
Topic: 10x Objective with delamination testing
Replies: 7
Views: 145

Re: 10x Objective with delamination testing

Hi, I agree. This looks as if the black paint, that masks the outer (unused) region of the front lens, has partially rubbed off. I have seen this frequently on 160 mm objectives from Olympus and Nikon. The black masking paint is partially or completely stripped by harsh or too frequent lens cleaning...
by Ichthyophthirius
Fri Oct 23, 2020 12:03 pm
Forum: Macro and Micro Technique and Technical Discussions
Topic: Nikon 40X 0.55 LWD
Replies: 2
Views: 49

Re: Nikon 40X 0.55 LWD

Hi, I can't answer your questions directly. But I can say that a priori the BEST way of adapting this lens is to use it without a tube lens of any kind. Just an empty, flocked tube with a length of 150 mm to the sensor will give you the best results. Adding a tube lens will change the working distan...
by Ichthyophthirius
Sun Oct 11, 2020 4:53 am
Forum: Equipment Discussions
Topic: Can I push the resolution of a 1:1 macro lens?
Replies: 23
Views: 1125

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

Thomas wrote:
Sun Oct 11, 2020 2:33 am
I'm very happy with the RP.
* Stacking works just fine with the Sigma 150mm, as well as
Thanks for the feedback! That's the first confirmation I have found that the focus bracketing feature of the EOS RP works with Sigma lenses. http://www.photomacrography.net/forum/v ... =8&t=41629
by Ichthyophthirius
Sat Oct 10, 2020 5:03 pm
Forum: Macro and Micro Technique and Technical Discussions
Topic: Flash on the hotshoe
Replies: 2
Views: 244

Re: Flash on the hotshoe

A large conventional flash on top of the camera can work well if the lens has a long working distance so the flash isn't shaded by the lens barrel. The large distance between flash and subject give you lots of space for installing diffusers. However, it requires a lot of flash power because of the l...
by Ichthyophthirius
Thu Oct 08, 2020 6:12 am
Forum: Equipment Discussions
Topic: Can I push the resolution of a 1:1 macro lens?
Replies: 23
Views: 1125

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

I use a Canon EOS RP (pixel pitch ~5.76µm) with a Sigma 150mm 1:2.8 APO EX DG HSM macro lens. * Camera (USB tethered to PC) froze repeatedly during stacking. Seems to have problems shifting the lens focus. Hi, I think I will try Lou's suggestion with the teleconverter. But I'm really interested in ...
by Ichthyophthirius
Wed Oct 07, 2020 2:02 pm
Forum: Equipment Discussions
Topic: Sigma 105mm F2.8 DG DN MACRO Art
Replies: 8
Views: 349

Re: Sigma 105mm F2.8 DG DN MACRO Art

That was a delightful presentation. Thanks for the link!

I can also believe the increase in macro lens sales in Europe during lockdown that he talked about. Certainly confirms my own observations.
by Ichthyophthirius
Fri Oct 02, 2020 11:41 am
Forum: Macro and Micro Technique and Technical Discussions
Topic: Eyepiece projection, yes or not??
Replies: 14
Views: 676

Re: Eyepiece projection, yes or not??

Hi John, You haven't mentioned any microscope yet. I assume you have tried to attach the objective directly to your camera? The Nikon objectives produce an intermediate image of good quality with a diameter of something like 20 ... 25 mm. That's similar to both m4/3 and APS-C sensors. An easy way to...
by Ichthyophthirius
Fri Oct 02, 2020 6:42 am
Forum: Macro and Micro Technique and Technical Discussions
Topic: Eyepiece projection, yes or not??
Replies: 14
Views: 676

Re: Eyepiece projection, yes or not??

Hi John,

Can you also say what camera you use? It helps with telling you exactly what distances to use.
by Ichthyophthirius
Wed Sep 30, 2020 1:35 pm
Forum: Macro and Micro Technique and Technical Discussions
Topic: Eyepiece projection, yes or not??
Replies: 14
Views: 676

Re: Eyepiece projection, yes or not??

I agree. The higher the NA, the more important it is to follow in objective labels for tube length and cover glass. Above NA 0.35, presence/absence of the cover glass is important and above NA 0.55, the tube length needs to be within millimeters of the design (for example for direct projection, 150 ...
by Ichthyophthirius
Mon Sep 28, 2020 2:11 pm
Forum: Equipment Discussions
Topic: Horizontal Column Tripod
Replies: 6
Views: 734

Re: Horizontal Column Tripod

I"m just starting out in macro photography Just a sidenote. I had a related choice to make recently https://www.photomacrography.net/forum/viewtopic.php?f=8&t=42059 and my takeaway since 8-[ has been that you should invest in your flash setup first, if you haven't already, before getting a tripod. ...
by Ichthyophthirius
Fri Sep 25, 2020 3:55 am
Forum: Equipment Discussions
Topic: Can I push the resolution of a 1:1 macro lens?
Replies: 23
Views: 1125

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

Thank you for sharing their experiences and suggestions! I think I will give the teleconverter a try while keeping a close eye on the apertures I use.
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: 1125

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: 1015

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: 1015

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: 1125

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...