BJL

Lives in United States United States
Joined on Dec 17, 2002

Comments

Total: 933, showing: 1 – 20
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In reply to:

4sirh: According to Dr. Roger Clark (https://clarkvision.com/articles/eye-resolution.html), the resolution of the human eye is 576 megapixels. That is getting closer to our own eyes.

Besides ignoring the fact that our “detail vision” is only over about a 60° field of view, those measures are solely based on photoreceptor density of the retina, ignoring the resolution limits of the eye’s lens; diffraction and all that. We Nedra good light, our eyes are about a f/4, 16mm lens. So a bit like this 200MP sensor greatly over-sampling what the phone-camera lens in front if it will deliver. (Not that oversampling is bad; it is useful for AF, HDR and such)

Link | Posted on Jun 26, 2022 at 00:30 UTC

It's rare to see the DPReview forums get excited about a camera that uses sensors smaller than the ones in smart phones. (I do see its possible industrial/lab role though.)

Link | Posted on Jun 22, 2022 at 02:31 UTC as 8th comment
In reply to:

sirhawkeye64: Makes me wonder what's going to happen to all those entry level college courses on photography that require you to shoot film at first... Granted, some of that is probably included as "part of the class" so the price for such classes (or rather, the "fees" like "technology fees" will increase as a result). I was looking into a class about a year ago, at the local community college (not that I was going to take it, but for someone else who wanted to get into photography and wanted a beginners class) and they required that people shoot B&W film as one of their first hands-on class, after photographic theory).

of course I'm sure if schools are buying films in bulk for educational use they likely get a decent discount ,but I'm sure prices are still increased even for them. I can only imagine what it would cost for a student who was required to shoot film and produce X number of prints (photos) for a photography class using film. Luckily I only shoot film as a hobby, so I can cut back.

At a guess, color film will get squeezed out of most photography courses, in favor of a mix of B&W film (much easier for learning darkroom) and digital.

Link | Posted on Apr 20, 2022 at 23:27 UTC
In reply to:

content_creator_666: "What We Don't Like:
Keyboard and mouse not included"

Lol, no.

1. The Apple keyboards and mouse are junk and super uncomfortable (low-travel keyboard and the mouse... well, you know)
2. Would drive the price up for parts most people already have / don't need
3. It's not an iMac with all the family-friendly colour-coordinated case candy
4. It has USB-C ports, so use whatever you have lying around (a £10 Logitech mouse is better than the Magic Mouse)

I like the design. Maybe it would fit in a GameCube carry case :) Although they missed the opportunity to have the front ports make this face: -_-

Shame about the slower SD card slot. Is there an issue with the M1 design that doesn't let it have HDMI 2.1? Why is the Ultra version nearly 1kg heavier?

Also, please get an Intel 12th gen machine already for comparisons. They have been out for months now and reviewed by all the major sites and YouTube channels etc. You're a big site and lagging behind.

Oh and who said the 27" iMac is dead?

I agree that a computer like this should not be bundled with keyboard, mouse or display—typical customers almost certainly already have such peripherals, and/or want to make their own choices.
It’s ironical that some criticise the lack of modularity (a common Apple weakness, and my one frustration with my iMac, whose display is still fine but will soon have to be surplussed along with the slow old CPU), but then object to this little bit of modularity.

Link | Posted on Mar 17, 2022 at 20:55 UTC
In reply to:

Jer81: Looks nice, but the cheapest one is €2329. Fot that money you can build a nice pc tower. The Mac Mini is way more attractive as soon as they release a 2022 version.

Buon your own is always going to be cheaper, and Apple is just not in that market. The far more relevant comparison for the vast majority of computer buyers is “pre-built”, Apple vs Windows options.

Link | Posted on Mar 17, 2022 at 20:47 UTC
On article What is dual gain and how does it work? (168 comments in total)
In reply to:

kitsnet: Why would dual gain be more useful at higher ISOs (higher base hardware amplification)? It seems to be exactly the opposite: the lower the ISO (as defined by the exposure at which clipping in the highlights occurs) is, the more dynamic range from the exposure would be recoverable using dual gain.

The standard output based “JPEG at level 127” definitions are the only one ever used for the “ISO” setting on cameras, and indeed this is required by the industry association CIPA.

The relevant standards from ISO also included other measures like SSat (based on highlight clipping) and SNR10 and SNR40 (based on noise floor), but these are explicitly intended to give recommended upper and lower limits on safe usable Exposure Index, not as measures of “ISO speed” analogous to the old ISO/ASA speed of a film.

(The CIPA standard can be found online for free, whereas getting the related ISO standard costs.)

Link | Posted on Feb 23, 2022 at 20:40 UTC
In reply to:

Mister Joseph: Hey EU, how about your wall outlets too? lol

mais51, that is true for now, but Italy like the rest of the EU has now standardised on the “German plug”—which fortunately has the same configuration for the main two pins as most European countries have been using for a long time (just different earths and socket shapes). So the standadardization is rolling in.

P .S. Thanks for explaining the weirdess of Italy having two traditional plug/socket formats!

Link | Posted on Sep 26, 2021 at 23:47 UTC
In reply to:

stevevelvia50: I’m often playing games with the guys at the local camera store, bringing in 20x30 prints to show comparisons between my EM1 II (always on normal res) and full frame cameras (all different resolution cameras) cropped identically ( printed on my Epson 7880). . Can they see difference?, well yes and no...depends. Sometimes I’ll have a little fun, bring in two identical prints from the same camera, and ask them which one is the Nikon or the Olympus.; they’ll pick one of course, gets them every time, all in good fun. Truth is, a lot of it is in your imagination.

@donpjt, I see no point in comparing lenses of the same focal length when used with different formats — what matters for recording a given composition is lenses that cover the same field of view.. For example, where one would use 200mm with Four Thirds format, one would use about 400mm with the 24x36mm "35mm" format. (Or if you used 200mm, one would have to crop down to using only the image from a part of the sensor of "Four Thirds size", making the larger total sensor area irrelevant.)

Link | Posted on Aug 11, 2021 at 20:39 UTC
In reply to:

stevevelvia50: I’m often playing games with the guys at the local camera store, bringing in 20x30 prints to show comparisons between my EM1 II (always on normal res) and full frame cameras (all different resolution cameras) cropped identically ( printed on my Epson 7880). . Can they see difference?, well yes and no...depends. Sometimes I’ll have a little fun, bring in two identical prints from the same camera, and ask them which one is the Nikon or the Olympus.; they’ll pick one of course, gets them every time, all in good fun. Truth is, a lot of it is in your imagination.

@Bazzh: "bigger glass" is "faster" in that an aperture of larger diameter gathers more photons per second from the scene — this is exactly the same reason that a lower aperture ratio (at equal focal length) gathers light faster.

(Did you really think I was talking about the speed of light?)

Link | Posted on Aug 11, 2021 at 20:32 UTC
In reply to:

stevevelvia50: I’m often playing games with the guys at the local camera store, bringing in 20x30 prints to show comparisons between my EM1 II (always on normal res) and full frame cameras (all different resolution cameras) cropped identically ( printed on my Epson 7880). . Can they see difference?, well yes and no...depends. Sometimes I’ll have a little fun, bring in two identical prints from the same camera, and ask them which one is the Nikon or the Olympus.; they’ll pick one of course, gets them every time, all in good fun. Truth is, a lot of it is in your imagination.

@donpjt That "better performance at equally high ISO speed" relies on using the same aperture ratio at twice the focal length (to get the same field of view), meaning in general a far bigger, heavier and probably more expensive lens with an effective aperture area four times as large.

For example, compare a 200/2.8 lens to a 400/2.8 for size, weight, cost: the first has effective aperture diameter of about 200mm/2.8 = 70mm, as indicated by the typical 72mm filters for such lenses; the second has effective aperture diameter about 400mm/2.8 = 140mm, so big that rear drop-in filters are usually used.

Bottom line: It is "bigger glass" the gathers light faster and so allows better low light/high shutter speed performance, not "bigger silicon" alone.

Link | Posted on Jul 18, 2021 at 18:49 UTC
In reply to:

Hellraiser: Lets go! A m43 camera with computational photography features!

Welsh make the usual assumption that the 36x24mm sensor is used with a lens of twice the effective aperture diameter, so about four times the effective aperture area—that’s what you get with the same aperture ratio and same field of view, which requires double the focal length.

Which is fine if the far bigger heavier lens and half the DOF is OK, but not if a smaller kit is desired ir you are stopping down to get enough DOF.

Link | Posted on Jul 18, 2021 at 02:11 UTC

A quibble on the medium format sizes: they are all a bit smaller that the nominal “6cm by 6cm” and so on. The emulsion is 56mm wide, and the common formats are 42x56mm, 56x56mm, 56x70mm. That is, 4:3, 1:1 and 5:4 shapes.

Link | Posted on Jun 1, 2021 at 22:57 UTC as 2nd comment
In reply to:

babis_greek: None for dslr mounts. All are trying to make them obsolete.

There are plenty of DSLR lenses out there — the new mounts and new lens design flexibility is naturally where the new lens design and production resources are going.

Market demand for OVF vs EVF cameras and lenses for them will dictate if and when one becomes obsolete, not some vast secret conspiracy.

Link | Posted on Mar 3, 2021 at 18:54 UTC
On article Zeiss ZX1 review (842 comments in total)
In reply to:

LookintotheMirrorlessoften: what we really need is a quick way to move raw files with a single touch or continuously to a phone or other mobile device
.

Agreed: a wireless transfer system — something like Apple's AirDrop (for moving photos between Mac and iPhone, for example) — would be far quicker and more convenient than fiddling with SD cards, cables, or such.

Link | Posted on Dec 29, 2020 at 21:45 UTC

Though 600MP sounds crazy except for heavy cropping (digital zoom) and then Tetracell-style binning for wider shots, there are already phone-camera lenses that do a decent job of resolving these 0.8 micron pixels. About f/1.4 is enough to get diffraction down to the level of blurring that demosaicing introduces anyway.

Link | Posted on Dec 8, 2020 at 14:39 UTC as 11th comment

To those worried about Adobe not having immediately produced M1-native versions of its apps, it is worth noting that so far only a couple of low-end Mac models have been converted to M1 chips. The higher-end MacBook Pros, all iMacs, and the Mac Pro are still Intel-only.
My guess is that the M1 chip is only intended for the lower part of the Mac product range, for example only supporting 2 Thunderbolt 3/USB4 ports, and a higher end "M1X" will be the one for power-users. Let's see if Adobe has hit the XCode "recompile for Apple Silicon" switch — or fixed its non-compliant legacy code — by the time that the higher-end MacBook Pros and such go to being available _only_ in Apple Silicon versions.

Link | Posted on Nov 16, 2020 at 23:03 UTC as 4th comment | 4 replies
In reply to:

panther fan: Maybe DPreview should have also listed the omissions these machines made compared to previous ones:

The Macbook Pro:
-only has 2x Thunderbolt now instead of 4x
-maxes out at 2TB SSD space instead of 4TB
-maxes out at 16GB of RAM instead of 32GB

The Mac Mini:
-Also only has 2x Thunderbolt ports
-No longer has the option for 10gbit ethernet
-No longer has the option of internal RAM upgrades
-Also maxes now out at 16GB

The Macbook air:
-The stuff above
-Changed the keyboard Layout of 5 keys, you now no longer have brightness keys for example

Also support for eGPUs has been dropped on all new Macs

My apologies; I misread the 2018 Mac Mini specs; as strawbale says, it has 4 TB3/USB-C + 2 USB-A

Link | Posted on Nov 12, 2020 at 17:59 UTC
In reply to:

panther fan: Maybe DPreview should have also listed the omissions these machines made compared to previous ones:

The Macbook Pro:
-only has 2x Thunderbolt now instead of 4x
-maxes out at 2TB SSD space instead of 4TB
-maxes out at 16GB of RAM instead of 32GB

The Mac Mini:
-Also only has 2x Thunderbolt ports
-No longer has the option for 10gbit ethernet
-No longer has the option of internal RAM upgrades
-Also maxes now out at 16GB

The Macbook air:
-The stuff above
-Changed the keyboard Layout of 5 keys, you now no longer have brightness keys for example

Also support for eGPUs has been dropped on all new Macs

The Mini reverts from 4 TB4, 0 USB-A to 2 TB4, 2 USB-A, which is better for backward compatibility (flash drives, printers, etc.). That might make sense for the Mac Mini target market, which is the most price-sensitive part of the Mac market.

Link | Posted on Nov 11, 2020 at 21:00 UTC
In reply to:

Richard Murdey: "BCN Retail also notes that full-frame sales have hit 10.7% of the overall interchangeable lens camera (ILC) market, marking the first time it’s been in double-digits."

"ILC" includes dSLRs right? Since mirrorless accounts for about half of ILC, that means 20% of mirrorless cameras sold in Japan are FF.

Richard Murdey,
Your "10% plus half = 20%" arithmetic only makes sense if all or most FF ILCs are mirrorless, which is far from true. For example, another scenario is that the smaller ILC formats have roughly the same 90% of both the MILC and DSLR unit sales; FF with 10% in each size category. But with several brands offering MILC in only the smaller formats, not FF (Olympus, Fujifilm) my guess is that the smaller ILC formats have over 90% of the MILC market, under 90% of DSLR.

Link | Posted on Oct 28, 2020 at 22:18 UTC
In reply to:

BJL: Why report only the BCN numbers about the full frame niche, ignoring the dominant smaller format sector which — according to that BCN report — accounts for almost 90% of unit sales and 75% of revenues? (Yes, only for the Japanese market, but the whole BCN report and article is only about that market.)

Yes, but BCN reports on other categories too, so I am wondering why I have not read any of that reporting here lately

Link | Posted on Oct 26, 2020 at 23:19 UTC
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