Search found 224 matches
- Mon Aug 22, 2022 8:41 am
- Forum: Technical and Studio Photography -- Macro and Close-up
- Topic: Photo of Ploum
- Replies: 228
- Views: 136434
Re: Photo of Ploum
Phenakite Better https://www.geoforum.fr/uploads/monthly_2022_08/photo0119.jpg.42ba7e85bca3dadaea8f3b9666467d02.jpg https://www.geoforum.fr/uploads/monthly_2022_08/photo0119.thumb.jpg.8598f4d9ed23369afba7903c5a2df9ad.jpg Clinoclase Better https://www.geoforum.fr/uploads/monthly_2022_08/photo0117.jpg...
- Sat Aug 20, 2022 10:28 am
- Forum: Technical and Studio Photography -- Macro and Close-up
- Topic: Photo of Ploum
- Replies: 228
- Views: 136434
- Sat Aug 20, 2022 5:53 am
- Forum: Technical and Studio Photography -- Macro and Close-up
- Topic: Photo of Ploum
- Replies: 228
- Views: 136434
Re: Photo of Ploum
Some news https://www.geoforum.fr/uploads/monthly_2022_08/photo0097.thumb.jpg.d39aa36feedd1270a3459a7ab5f7dee2.jpg Better : https://www.geoforum.fr/uploads/monthly_2022_08/photo0097.jpg.a6bae7b1cd1add5c99fce249926b3c75.jpg https://www.geoforum.fr/uploads/monthly_2022_08/photo0095.thumb.jpg.cebf29524...
- Wed Dec 22, 2021 1:19 pm
- Forum: Equipment Discussions
- Topic: How good are alternatives (clones) to Mitutoyo lenses
- Replies: 111
- Views: 18537
Re: How good are alternatives (clones) to Mitutoyo lenses
Hello, I received the 2x 0.06. Jerry has done his job well and the transaction is fine. However my system unfortunately does not support this lens ... It is unsuitable for an FF and the image circle is small. The quality of the image is also inferior to what I would expect. A well-made componon will...
- Sun Nov 14, 2021 12:43 pm
- Forum: Equipment Discussions
- Topic: Mitutoyo M Plan APO HR 5X 0.21 Test Results
- Replies: 149
- Views: 16498
Re: Mitutoyo M Plan APO HR 5X 0.21 Test Results
Great links from Rik
- Sun Nov 14, 2021 7:33 am
- Forum: Equipment Discussions
- Topic: Mitutoyo M Plan APO HR 5X 0.21 Test Results
- Replies: 149
- Views: 16498
Re: Mitutoyo M Plan APO HR 5X 0.21 Test Results
I noticed that two pixels is not enough for a diffraction spot. The contrast is too low. It would be interesting if Robert likes the tests that he does tests with a USAF HR test chart that does groups 9 and 10. The reconstruction according to the focal length of the tube lens should allow me to find...
- Sat Nov 13, 2021 9:40 am
- Forum: Equipment Discussions
- Topic: How good are alternatives (clones) to Mitutoyo lenses
- Replies: 111
- Views: 18537
Re: How good are alternatives (clones) to Mitutoyo lenses
Hello,
for forum it's a 20 % discount i suppose ?
I have written for try a 2x 0.06
Fred
for forum it's a 20 % discount i suppose ?
I have written for try a 2x 0.06
Fred
- Wed Nov 10, 2021 10:56 pm
- Forum: Equipment Discussions
- Topic: Mitutoyo M Plan APO HR 5X 0.21 Test Results
- Replies: 149
- Views: 16498
Re: Mitutoyo M Plan APO HR 5X 0.21 Test Results
Thanks @ploum for your insights, need to learn more about all of these and what you are saying. Long time ago, there was a long discussion about something similar and eventually, I "had" (ie, no choice in face of facts) to agree with Rik who was trying so hard to teach us that fact. During that dis...
- Wed Nov 10, 2021 7:18 am
- Forum: Equipment Discussions
- Topic: Mitutoyo M Plan APO HR 5X 0.21 Test Results
- Replies: 149
- Views: 16498
Re: Mitutoyo M Plan APO HR 5X 0.21 Test Results
Here two objective APO PLAN on the same systeme (sensor, lens tube...)
What is the best ?
What is the best ?
- Wed Nov 10, 2021 6:41 am
- Forum: Equipment Discussions
- Topic: Mitutoyo M Plan APO HR 5X 0.21 Test Results
- Replies: 149
- Views: 16498
Re: Mitutoyo M Plan APO HR 5X 0.21 Test Results
I have an FF 36 Mpix sensor, and a 10X NA 0.25 objective. Can you tell me how to construct graphs like yours, for myself, for this combination? --Rik https://www.geoforum.fr/uploads/monthly_2021_11/image.png.166e95de8066d803c20a4f2880939700.png https://www.geoforum.fr/uploads/monthly_2021_11/image....
- Wed Nov 10, 2021 2:15 am
- Forum: Equipment Discussions
- Topic: Mitutoyo M Plan APO HR 5X 0.21 Test Results
- Replies: 149
- Views: 16498
Re: Mitutoyo M Plan APO HR 5X 0.21 Test Results
Yes i do when i finish my work :) All this to conclude that if I get a more contrasted image with a lens with a higher numerical aperture it is simply because the sensor can be in subsampling which means that the system will analyze lower frequencies through the objective and therefore give a more c...
- Wed Nov 10, 2021 12:31 am
- Forum: Equipment Discussions
- Topic: Mitutoyo M Plan APO HR 5X 0.21 Test Results
- Replies: 149
- Views: 16498
Re: Mitutoyo M Plan APO HR 5X 0.21 Test Results
I don't write an article here.... I must write that in French and for private books. An article need 150 pages.... and i have not time to do in english... I give some ideas for people. In fact i can use 0.55 um or 0.56 um for lentgh wave of green colore. it's not very important for me :) And if i do...
- Tue Nov 09, 2021 9:51 pm
- Forum: Equipment Discussions
- Topic: Mitutoyo M Plan APO HR 5X 0.21 Test Results
- Replies: 149
- Views: 16498
Re: Mitutoyo M Plan APO HR 5X 0.21 Test Results
wow, this thread has grown a lot, learning more here . . OK, back to crazy world :D I'm happy for that. In fact, those who want to understand my curves will understand everything they need to upgrade their equipment and better adapt their sensor and their objectives! In fact if we can optimize in t...
- Tue Nov 09, 2021 9:40 pm
- Forum: Equipment Discussions
- Topic: Mitutoyo M Plan APO HR 5X 0.21 Test Results
- Replies: 149
- Views: 16498
Re: Mitutoyo M Plan APO HR 5X 0.21 Test Results
0.61*lambda/0.21 Another example... Let me assume that for smallest FOV, you have somehow chosen LP/mm to match the Rayleigh criterion. Then the MTF of the objective for that LP/mm will be only about 9% = 0.09, as it always is for Rayleigh. From that, I conclude that the overall system MTF = object...
- Tue Nov 09, 2021 12:04 pm
- Forum: Equipment Discussions
- Topic: Mitutoyo M Plan APO HR 5X 0.21 Test Results
- Replies: 149
- Views: 16498
Re: Mitutoyo M Plan APO HR 5X 0.21 Test Results
Usual math. Rayleygh criterion, sampling on the sensor, MTF, minimum sampling of the sensor at 2.5-3 pixels per LP .... https://www.geoforum.fr/uploads/monthly_2021_11/image.png.b5df806e005f6d95dc69c1a1ded23862.png https://www.geoforum.fr/uploads/monthly_2021_11/image.png.b5df806e005f6d95dc69c1a1ded...