ProfHankD

ProfHankD

Lives in United States Lexington, United States
Works as a Professor
Has a website at http://aggregate.org/hankd/
Joined on Mar 27, 2008
About me:

Plan: to change the way people think about and use cameras by taking advantage of cameras as computing systems; engineering camera systems to provide new abilities and improved quality.

Comments

Total: 830, showing: 1 – 20
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On article Heavy hitter: Sony FE 24-70mm F2.8 GM first shots (273 comments in total)
In reply to:

HowaboutRAW: Why the lossy raws?

HowaboutRAW: You need a 32-pixel chunk to have more than 7 bits (very roughly, about 7 stops) brightness range to have potentially significant artifacting. That does happen, but by any reasonable definition of "mid tones" it can't happen in mid tones, because that large a range doesn't fit in the middle tones. If you see something odd in mid tones, it's because of an odd choice in postprocessing.

Incidentally, I have been using my A7II with uncompressed raw for a while now and by far the biggest difference I've seen is that many raw converters handle the two formats very differently, including Adobe DNG converter giving different color treatment. Those differences are simply bugs in the postprocessors and, honestly, more do better with the older compressed format.

Direct link | Posted on Feb 6, 2016 at 14:42 UTC
In reply to:

PKDanny: They should make AF lenses. Or. They are lazy!!

Almost impossible to make a fully adaptable mount that supports AF on all body mounts... that's really why manual: no one AF mount is all that hard to support, but supporting lots without changing internal lens structure is very difficult.

Direct link | Posted on Feb 6, 2016 at 12:13 UTC
In reply to:

ProfHankD: Why do they make the part that sticks nearest the sensor shiny metal?

Mistajolly: that would make sense. The B&H photos don't show most mount versions, but the E and EF versions look like they cover-up that with a black edge around the element, although it's still got a thicker-than-average shiny ring around the inside of the mount (as most Samyangs do). It doesn't look like PL mount would have space to cover the end of the shiny part, but maybe...?

I don't know where DigitalWalnut is getting these wrong ideas about a shiny surface being more durable or in any way desirable on the inside of an optical system. My guess is this was an ill-advised marketing-over-engineering decision to give the mount a distinctive look. Probably not a dealbreaker; I've not had obvious reflections from the shiny parts of my Samyangs... speaking as an enginer, it's just a dumb thing to risk.

Direct link | Posted on Feb 6, 2016 at 12:11 UTC
In reply to:

ProfHankD: Why do they make the part that sticks nearest the sensor shiny metal?

The red ring doesn't bother me; it's not near the optical path. It's the shiny lens tube that sticks inside the mount. Looks clear anodized. Virtually certain to give sensor reflection issues in some circumstances.

Direct link | Posted on Feb 6, 2016 at 05:57 UTC
In reply to:

ProfHankD: Why do they make the part that sticks nearest the sensor shiny metal?

DigitalWalnut: nope. Unless I'm very mistaken, they simply went with the unwise light-colored anodized finish here while the rest of the lens is anodized dark. The different colors are equally (and very) durable -- in fact, that's why you anodize: it makes the surface finish more durable.

Direct link | Posted on Feb 6, 2016 at 04:24 UTC

Why do they make the part that sticks nearest the sensor shiny metal?

Direct link | Posted on Feb 6, 2016 at 00:39 UTC as 2nd comment | 9 replies
On article Heavy hitter: Sony FE 24-70mm F2.8 GM first shots (273 comments in total)
In reply to:

HowaboutRAW: Why the lossy raws?

I can answer that now: fewer than 300 people.

Direct link | Posted on Feb 6, 2016 at 00:24 UTC

Wow. That is really a nice lens. The bokeh look solid A quality and what's in focus wide open is crisp at 42MP, apparently even way off axis. Hate to say it, but this might actually be well worth its price... and that's not something I'd normally say about a lens in this price class. Sony hasn't done well in making cheap E-mount glass, but they certainly have been making sure that their high-end glass delivers.

Direct link | Posted on Feb 4, 2016 at 13:41 UTC as 49th comment | 6 replies
In reply to:

ProfHankD: By Sony standards, this is a fairly incremental improvement. Still impressive and, perhaps most importantly, very clearly treating APS-C as a fully respected part of the current family.

I agree that this is not the super-awesome-huge-jump that Sony has had in some models, but it's generally a big step up in both stills and video over Sony's current #2 FF model (the A7II), which seems like a pretty clear commitment to APS-C... like I said. I doubt IQ will match my A7II, but silent shutter, faster framerate, no EVF interruption, ... these are not small things. And, incidentally, for A-mounts using the LA-EA4 and for all manual lenses, where the A7 ended-up is at the top of the heap... until the A7II series came out.

In any case, looking at the equipment you say you own, all of it looks very "meh" compared to this (the Nikon D750 can use about 5 of my 140+ lenses, the Fujis and Panasonic you have are not competitive even with an A6000 in IQ). Honestly, I think the A7II family is in a class by itself -- especially for adapted lenses -- and the A6300 basically puts an APS-C body in the same class. My only disappointments are pricing and lack of IBIS.

Direct link | Posted on Feb 4, 2016 at 05:24 UTC
In reply to:

ProfHankD: By Sony standards, this is a fairly incremental improvement. Still impressive and, perhaps most importantly, very clearly treating APS-C as a fully respected part of the current family.

SSantana: you didn't read the release, did you?

This claims to do fast AF with more PDAF sensels and similar performance to the A7RII with A-mounts on LA-EA3 (which also works for Canon EF/EF-S lenses on various adapters, etc.). Incidentally, using an LA-EA4, A-mount lenses focus quite fast even on my old NEX-7... although the LA-EA4 is cheating because it includes an SLT mirror and PDAF focus sensor. The only A-mount issue is really that the LA-EA3 doesn't AF screw-drive lenses; we really need an LA-EA3.5 that has screw drive support but doesn't have the no-longer-needed SLT mirror and PDAF sensor in the LA-EA4.

BTW, I mostly use manual lenses with my APS-C/FF Sonys and the A6300 still sounds good even to me -- mostly for the silent shutter and improved video (120FPS full 1080, S-Log3 4K, etc. is pretty rare -- much better than my A7II!).

Direct link | Posted on Feb 4, 2016 at 02:50 UTC
In reply to:

ProfHankD: By Sony standards, this is a fairly incremental improvement. Still impressive and, perhaps most importantly, very clearly treating APS-C as a fully respected part of the current family.

Not kidding. There are plenty of lenses, including every one made for A-mount or EF-mount.

Direct link | Posted on Feb 4, 2016 at 01:16 UTC

By Sony standards, this is a fairly incremental improvement. Still impressive and, perhaps most importantly, very clearly treating APS-C as a fully respected part of the current family.

Direct link | Posted on Feb 3, 2016 at 23:31 UTC as 139th comment | 6 replies
In reply to:

Boss of Sony: I'll be interested to see how the image quality compares with the Pentax Q.

Of course, IQ will be somewhere between the Q-S1 and the 645Z. Much closer to the 645Z, we hope and expect. ;-)

Direct link | Posted on Jan 29, 2016 at 03:19 UTC

From the PENTAX WWW site:

*shot with a camera under development. larger image's size: 1000px x 667px

Wow! And I thought Sony's A7S was bold to go with only a 12MP sensor! ;-)

Seriously? Sub-megapixel images to brag about FF lens IQ?

I wish Pentax would just get the camera out. These "teasers" seem like sad little attempts to tell the faithful not to switch to Sony yet... and since there isn't any AF adapter for Pentax lenses on Sony (yet), they're probably safe-ish? I think we all expect good things from Pentax, but this sequence of vacuous posts looks more and more like they're having problems in development, and isn't sending a positive message.

Direct link | Posted on Jan 29, 2016 at 02:50 UTC as 72nd comment | 2 replies
In reply to:

Magnus Wedberg: The linear drive system is much older than Anti-Shake/Steady Shot: this is an old Minolta patent, from the 90s I think. I discovered the patent myself and posted about it on the now defunct MML (Minolta Mailing List) back then. Nice to see it used, even if one might suspect some earlier lenses having this system too.

When Sony took over the Minolta camera business, it wasn't clear what that would mean. However, I think it is now quite clear that Sony has made exceptionally good use of many Minolta insights and IP not just to do what Minolta did, but to make new innovations ever more tightly integrated with Sony's own tech. Speaking as an engineer, I really respect that they're trying things like this.

Direct link | Posted on Jan 27, 2016 at 05:17 UTC
In reply to:

ProfHankD: Once again, Fuji has built a desirable, yet overpriced (and oversized), APS-C camera that could be mistaken for a Leica that somehow lost its red dot. I think the DR mode 100%, 200%, and 400% concept is very nice, and something Sony should really put into their cameras in some form -- I'm in favor of anything that gives independent control of the analog and digital components of ISO settings.

I think DRO can have an impact on exposure, but it certainly isn't much. This is one of those aspects that Sony, Nikon, and others who all started with the same purchased base technology diverged on as each tweaked their version. I certainly agree that Sony's DRO tends to help the appearance of camera JPEGs.

Direct link | Posted on Jan 26, 2016 at 03:01 UTC
In reply to:

ProfHankD: Once again, Fuji has built a desirable, yet overpriced (and oversized), APS-C camera that could be mistaken for a Leica that somehow lost its red dot. I think the DR mode 100%, 200%, and 400% concept is very nice, and something Sony should really put into their cameras in some form -- I'm in favor of anything that gives independent control of the analog and digital components of ISO settings.

tesilab: I love DRO, but that's completely unrelated. DRO is basically localized shadow enhancement, while the DR mode on this Fuji is apparently directly allowing a deliberately underexposed (lower analog gain) raw to be mapped into a nice (higher digital gain) JPEG in camera. In fact, this is something Jim Kasson and I had a couple of forum posts about just yesterday -- the possibility of creating a Sony camera app to offer separate control of analog and digital ISO components. I have done things like this using CHDK in Canon PowerShots....

Direct link | Posted on Jan 25, 2016 at 23:59 UTC

Once again, Fuji has built a desirable, yet overpriced (and oversized), APS-C camera that could be mistaken for a Leica that somehow lost its red dot. I think the DR mode 100%, 200%, and 400% concept is very nice, and something Sony should really put into their cameras in some form -- I'm in favor of anything that gives independent control of the analog and digital components of ISO settings.

Direct link | Posted on Jan 25, 2016 at 16:01 UTC as 135th comment | 10 replies
On article Otherworldly? Lomography introduces Jupiter 3+ lens (159 comments in total)
In reply to:

HB1969: There seem to be a few of these "new-old lenses" about. It's not just the Petzval and now Jupiter 3...there's the Helios-40 (85mm f/1.5) which is back in production and a kickstarter to get Meyer-Optik-Gorlitz Trioplan (100mm f/2.8) back. Interesting time in manual focus photography.

Samyang is definitely the closest, with a spread of cool, yet cheap, lenses. However, they're still much more conservative than Spiratone was... no really wacko toys (yet). I'd encourage Samyang to be more wild, but I certainly understand that there is risk in that because it would make some people take them less seriously. Spiratone somehow managed to be both lunatic fringe and respected by professionals at the same time....

Direct link | Posted on Jan 22, 2016 at 15:10 UTC
On article Otherworldly? Lomography introduces Jupiter 3+ lens (159 comments in total)
In reply to:

HB1969: There seem to be a few of these "new-old lenses" about. It's not just the Petzval and now Jupiter 3...there's the Helios-40 (85mm f/1.5) which is back in production and a kickstarter to get Meyer-Optik-Gorlitz Trioplan (100mm f/2.8) back. Interesting time in manual focus photography.

I think EVF focus peaking has made manual focus arguably better than AF for most uses, and I own over 140 old lenses, but I don't think expensive modern lenses that mimic obvious optical defects from old lenses are inherently interesting. There are some interesting ultra-fast lenses now, but who is going to be broadly innovative and cheap, i.e. fun? Put another way, I really miss Spiratone....

Direct link | Posted on Jan 22, 2016 at 05:02 UTC
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