Search found 9 matches

by Lopezlago
Sun Jul 14, 2019 8:14 pm
Forum: Macro and Micro Technique and Technical Discussions
Topic: Houston... we have a problem
Replies: 10
Views: 5893

Well, with this formulation I have compiled an Excel spreadsheet that I have used these last months and it has worked very well for me. This is my small contribution for those who need it, thanks for your help. (It's in Spanish but it's easy to understand) https://www.facebook.com/groups/macroextrem...
by Lopezlago
Tue Mar 12, 2019 5:19 pm
Forum: Macro and Micro Technique and Technical Discussions
Topic: Houston... we have a problem
Replies: 10
Views: 5893

Sorry Rik I think initially I was not as careful as I said. To make sure I did not have any doubt, I measured the test in printed photos, but in the crosschecking I only reviewed it in the live view of the camera with a caliper. (error!). After write the post, I remembered my friend Murphy and, well...
by Lopezlago
Tue Mar 12, 2019 11:27 am
Forum: Macro and Micro Technique and Technical Discussions
Topic: Houston... we have a problem
Replies: 10
Views: 5893

Hi Rik: I have done the tests carefully to have results that are not affected by rounding or approximations: Amscope Plan 4X and 23.6mm sensor (APS-C) T1: 10.60 and L = 90mm; m = (23.6 / 10.6) = 2.23 T2: 5.60 and L = 150mm; m = (23.6 / 5.6) = 4.21 A doubt, the nominal magnification for 150mm (160-10...
by Lopezlago
Mon Mar 11, 2019 8:31 pm
Forum: Macro and Micro Technique and Technical Discussions
Topic: Houston... we have a problem
Replies: 10
Views: 5893

--- IN REVIEW ---
by Lopezlago
Mon Mar 11, 2019 2:01 pm
Forum: Macro and Micro Technique and Technical Discussions
Topic: Houston... we have a problem
Replies: 10
Views: 5893

Thanks My idea is to locate the focus of the microscope lens, so I think (am I wrong?) to replace the nominal parameters to determine a real L, so that I could clear the precise location of the focus and correct the L total. For my Amscope Plan 4X I considered 10 mm, but when looking for a value tha...
by Lopezlago
Mon Mar 11, 2019 8:25 am
Forum: Macro and Micro Technique and Technical Discussions
Topic: Houston... we have a problem
Replies: 10
Views: 5893

Crystal! I have done the numbers and it is much closer to the sampled values. It is possible that some differences are due to approximations in the calculation of m over the screen in the sampling or to the estimation of the location of the focus in the lens (which can change the total L). Absolutel...
by Lopezlago
Sun Mar 10, 2019 12:47 pm
Forum: Macro and Micro Technique and Technical Discussions
Topic: Houston... we have a problem
Replies: 10
Views: 5893

Houston... we have a problem

Friends: I built a spreadsheet to calculate the number of steps and the DOF for stacking. For photographic lenses everything is fine. The theory and data fit perfectly; however, the same does not happen with the calculation for finite microscope lenses, I used the augmentation formula: m = L * Nomin...
by Lopezlago
Sun Mar 10, 2019 7:43 am
Forum: Community Members and Friends
Topic: Hello from Chile
Replies: 3
Views: 8350

Thanks Ulrik, I will try to show my best effort in macro.
by Lopezlago
Tue Mar 05, 2019 1:57 pm
Forum: Community Members and Friends
Topic: Hello from Chile
Replies: 3
Views: 8350

Hello from Chile

Hi, I'm Fernando from Chile. I am an amateur photographer mainly interested in nature photography and within those macro-photography. For a couple of years now, I have been stacking and I recently acquired a Stackshot rail. Also, for some time, I have been reading this forum and learning from the co...