## Search found 9 matches

Sun Jul 14, 2019 8:14 pm
Forum: Macro and Micro Technique and Technical Discussions
Topic: Houston... we have a problem
Replies: 10
Views: 5584
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...
Tue Mar 12, 2019 5:19 pm
Forum: Macro and Micro Technique and Technical Discussions
Topic: Houston... we have a problem
Replies: 10
Views: 5584
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...
Tue Mar 12, 2019 11:27 am
Forum: Macro and Micro Technique and Technical Discussions
Topic: Houston... we have a problem
Replies: 10
Views: 5584
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...
Mon Mar 11, 2019 8:31 pm
Forum: Macro and Micro Technique and Technical Discussions
Topic: Houston... we have a problem
Replies: 10
Views: 5584
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Mon Mar 11, 2019 2:01 pm
Forum: Macro and Micro Technique and Technical Discussions
Topic: Houston... we have a problem
Replies: 10
Views: 5584
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...
Mon Mar 11, 2019 8:25 am
Forum: Macro and Micro Technique and Technical Discussions
Topic: Houston... we have a problem
Replies: 10
Views: 5584
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...
Sun Mar 10, 2019 12:47 pm
Forum: Macro and Micro Technique and Technical Discussions
Topic: Houston... we have a problem
Replies: 10
Views: 5584

### 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...
Sun Mar 10, 2019 7:43 am
Forum: Community Members and Friends
Topic: Hello from Chile
Replies: 3
Views: 8040
Thanks Ulrik, I will try to show my best effort in macro.
Tue Mar 05, 2019 1:57 pm
Forum: Community Members and Friends
Topic: Hello from Chile
Replies: 3
Views: 8040

### 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...