billben74 wrote: ↑

Fri Dec 25, 2020 6:12 am

Apologies but could someone confirm that a7R 2 also has electronic first shutter ?
[...]

The A7RII has both electronic first curtain and fully electronic shutter (which are two separate settings in the menu). Verified it just now on my A7RII.

Report stating that non-line-of-sight imaging is about to become usable:

https://www.laserfocusworld.com/detecto ... 0965823D2G

[...] It [SWTLU] is cheaper than the U-TLU, which surprises me. There's also a U-SWTLU-SP which is $4075 (yes, four thousand), it uses ecoglass. Not sure if there's a pictorial difference. The fact that the SWTLU is cheaper than the U-TLU is probably explained by the fact that the SWTLU is just an ...

Nice, 2011 is the earliest use of M12 lenses I've seen did you invented yourself? or can we find someone earlier? For the same use I'm looking for pinhole-type objectives, with forward pupil, maybe wider and with better optics. Marco Cavina described the Zeiss "Sonderobjektiv", a pinhole lens for 3...

Years ago I did some work with a relay system, which I described in my 2011 book "Digital photography for science". While the discussion in the book contains additional details, the essential components from front to rear are: - A short-focal-length "pinhole lens" in CS mount (I used both a 2.8 mm f...

The M Plan Apo NIR series is corrected from 480 to 1800 nm, so they likely display chromatic aberration in the 400-480 nm range (blue and indigo). Anything above 1,000 nm likely cannot be recorded with a Bayer sensor even after removing the NIR- and NUV-cut filters of the camera, so you would be pay...

I found this lens's narrative arc very strange. One kind of gets the impression this company has no idea what they're doing, but I almost never follow normal camera lens development so I don't know if this kind of thing is normal? I would not say it is normal, but it is not unheard of either, espec...

The redesign caused the nominal aperture to increase from f/2.8 to roughly f/4.8-f/5.6 I would suggest the aperture decreased or was reduced. The way I use the term aperture value in the review is in the sense of f/ratio. This is the aperture as expressed in several of the geometric optics formulas...

I have written an in-depth review of the Mitakon Creator 85mm f/2.8 1-5X Super Macro (the Mark II version of this lens) because the reviews I found online do not answer several of my questions about this lens. The text is not final and the page is not yet linked to the rest of my web site, but can b...

Mantodea are often kept as pets. There is quite a bit of advice on the web, for example https://www.keepinginsects.com/praying-mantis/care/ and links therein.
(at the above link, I could not resist laughing at the misspelling "live in desserts")

Lou Jost wrote: ↑

Wed Oct 14, 2020 6:51 am

I added a short discussion and a couple of links about the other methods.

Thanks, that will be helpful to many.

I could not find the new additions, am I missing something?

Perhaps there is a server cache or something else that does not update immediately.

[..]In the intro to the article, you mention two of the ways to get higher magnification out of a 1x macro lens, but you leave out what is potentially the best way, reversing it not on extension tubes but on a tube lens. I think it would be a more complete article if you mention that option and its...

As I explained above, with modern lenses that have floating elements, you should have used a teleconverter instead of extension tubes. Otherwise you aremoving the lens far from ist design point. I just published a page on my site dealing with tests of four legacy macro lenses with a 2x teleconverte...

Let's see whether I understand the problem correctly, or I am making a mistake somewhere. We assume that the pupil ratio is 1 for simplicity, so the effective aperture A' is A' = A * (m + 1) where A is the nominal aperture, and m the magnification. So if we focus a lens at m = 2 by extension alone (...

[...] I am using BX53 stand just to clarify, very interesting pointers about provis models, well I really like 53 because it has small footprint and does not take much space on my very busy table! [...] Indeed, the Provis stand weighs north of 50 kg "naked", needs a strong table, and most functions...