Jwelz

Joined on Oct 12, 2018

Comments

Total: 71, showing: 1 – 20
« First‹ Previous1234Next ›Last »
In reply to:

forest dream: The advantage of these under-display front camera is can put larger front sensor (same size with rear camera. E.g. 1/1.33" sensor) since not need consider impact to front-end screen size. If 1/1.33" sensor for front camera, will be game changer.

It could be used for a front facing multi-lens light field camera. This tech may be a solution looking for a problem.

Link | Posted on Jun 12, 2020 at 14:49 UTC

I'm in the market for a new phone. My current one has:
IR blaster
FM Tuner
Micro SD slot
User replaceable battery

The user replaceable battery is great for drone flying since using the port for charging while flying isn't possible. The FM radio is great for listening to news and music without using data.

This phone has a low power notification panel at the top of the screen left of the front camera.

I can't find a new phone with this combination of features. Guess I'll keep it another year.

Link | Posted on Jun 12, 2020 at 14:27 UTC as 1st comment
On article Nikon Coolpix P950 review (227 comments in total)
In reply to:

Dan Wells: It's severely diffraction-limited. Especially at the longer end of the zoom range... That sensor size and resolution requires an f2.0 lens not to lose image quality to diffraction.

At the long end of the range, the P950 is a 3 mp camera due to diffraction, assuming that the lens and sensor were perfect (but no faster and no bigger). There's no need for a better sensor, unless it's a bigger sensor (which means a bigger, heavier lens).

Diffraction does impact the resolution however, as a video camera, a 12 megapixel sensor cropped to 4K 3:2 aspect ratio and rendered to 1080P could be better than the slightly too dense sensor in the P950 and P1000. I use the P1000 primarily for video and there is simply nothing that is appreciably sharper for practical video in reasonable light even at 20 to 200 times the cost. Furthermore, at 2000 mm or greater equivalent focal length, there's nothing you can take to a location that doesn't require truck access. You can pack these cameras and get video inaccessible otherwise, whether due to cost or transport or physical limitations. The stabilization shines handheld at focal lengths up to about 1000 mm equivalent and after that, brace with solid objects and beanbags. Don't get me started on the tripod mount location. I've not done pan/tilt/zoom during an extreme focal length shot since a capable tripod is heavier and pricier than feasible.

Link | Posted on Jun 9, 2020 at 15:26 UTC
On article Nikon Coolpix P950 review (227 comments in total)
In reply to:

tbcass: Your samples clearly show why photographing with a 2000mm equiv lens has such limited use for anything but astro use. The quality is terrible due to atmospheric distortions. I found that out long ago when using a telescope and a 35mm SLR for terrestrial use.

Atmospheric effects are mitigated by shooting closer subjects, from a higher vantage point, subjects further above the ground and when the air is calm without drastic temperature differentials.
If you've ever watched a sporting event shot in 4K, it was usually done with a wide range zoom box lens topping out at 2000 to 3000 mm on a sensor no larger than twice the area of the Nikon's. The lens costs between 100K and 300K before you buy the camera. The Nikon does a reasonable job of getting similar results in good light.
On the other hand, have you ever seen a spaghetti western shot of a lone rider on horseback at long distance shimmering and waving on screen? The effect can be deliberate and useful in conveying a feeling.
Not all photo/videography is about the clearest sharpest images.

Link | Posted on Jun 8, 2020 at 14:59 UTC

I use a P1000 for 4K long continuous zoom video and it yields nice results in bright light. It might not match a $200,000.00 and up box lenses of similar zoom specs for network TV with slightly larger sensors, but it gives me very nice shots that are limited more by atmospheric effects than lens or sensor limitations. Box lenses have bigger apertures with less diffraction but with only about 8 megapixels for 16:9 4K, the difference is not really that huge. At under 1/200th the cost and flexibility as to where the camera can be stationed and relocated on a whim, the P1000 fills a niche. I would have been comfortable with the P950 zoom range but have used the full range on the P1000 often. I would have liked a 4K 1:1 megapixel count for the full screen width cropped top and bottom from the 4:3 sensor; so something like a 12 megapixel sensor in this camera before I would consider it. Perhaps the future P1000 replacement?

Link | Posted on Feb 19, 2020 at 17:52 UTC as 1st comment
In reply to:

adamparker: HP provides a lot of high-quality printers with great advance features to the customer. But like other electronic components, a user may face many problems with this device so you can visit our site https://www.123hp-com.com/ . Need help with HP printer installation, configuration, or troubleshooting? Get in touch with HP printer customer service by dialing the toll-free support phone number +1-800-237-0201

I have an HP 460 portable battery printer. No luck from the HP forums getting that to work on Win 10. I get random garbage output with small fonts even on Win 7. Occasionally, I'll get a decent print but it's so rare that I've given up. Similar story on my 13 by 19" HP printer. Replaced print head and ink and no go. No wothwhile support help. I've owned numerous HP printers and I'm forever done with their inkjets.

Link | Posted on Jan 28, 2020 at 16:24 UTC
In reply to:

Michael Meissner: I am mostly a stills photographer, but I occasionally shoot video of live events. So when I look for an upgrade, the stills behavior is still the most important thing, but I do keep an eye on the video stuff as well.

As I understand it, the G9 is still limited to 29 minute and 59 second recording, so for the type of things I record video for, it is a non-starter.

If you are recording scripted stuff where you can do multiple takes, it looks like the firmware upgrade makes the G9 camera better. But if you shoot live events, where you can't control the event length, the G9 is still limited.

And as Jordan mentions, the auto focus behavior is still not ideal.

I imagine it has the issues I've seen with other Panasonic bodies (tendency to burn out highlights of white areas without having to dial in negative exposure compensation and raise it in post, and also poor JPG high ISO noise removal).

Too bad the E-m5 mark III also limits its video length.

Not only Europe per http://www.steves-digicams.com/news/the_30_minute_video_capture_limit_may_come_to_an_end_for_digicams_and_hd_dslrs_1.html#b

"The problem is that any camera that can record for longer than 29 minutes and 59 seconds is officially classified as a video camera by the WTO. This classification means that the cameras would be subject to a 5% duty fee, which would in turn raise prices.

There are high hopes that video cameras will soon be added to the Information Technology Agreement (ITA), which would mean the fee would not apply. If this happens, you can say goodbye to that half-hour limitation."

Link | Posted on Nov 14, 2019 at 04:33 UTC
In reply to:

Michael Meissner: I am mostly a stills photographer, but I occasionally shoot video of live events. So when I look for an upgrade, the stills behavior is still the most important thing, but I do keep an eye on the video stuff as well.

As I understand it, the G9 is still limited to 29 minute and 59 second recording, so for the type of things I record video for, it is a non-starter.

If you are recording scripted stuff where you can do multiple takes, it looks like the firmware upgrade makes the G9 camera better. But if you shoot live events, where you can't control the event length, the G9 is still limited.

And as Jordan mentions, the auto focus behavior is still not ideal.

I imagine it has the issues I've seen with other Panasonic bodies (tendency to burn out highlights of white areas without having to dial in negative exposure compensation and raise it in post, and also poor JPG high ISO noise removal).

Too bad the E-m5 mark III also limits its video length.

In 2006, the European Union created a law that added an import duty of 5-12% to any video camera. What determined whether a camera was a video camera? In short, the ability to record longer than 30 minutes.

Just keeping the camera affordable.

Link | Posted on Nov 13, 2019 at 23:19 UTC
In reply to:

Jwelz: If you've ever used a camera with an optical rangefinder, you would understand how stereo parallax allows you to distinguish distance to an object. You can't focus a horizontal rangefinder on a horizontal object or on objects with a repeating horizontal pattern. My Mavic Pro thinks a horizontal cable, window sill or roof edge is at infinity. Turn the drone 90 degrees so the stereo pair of cameras is perpendicular to such object and it can see the range. Objects at an angle to the stero pair are determined to be farther than they are the closer to horizontal they are. I don't use the collision avoidance. Only cameras using at least 3 coplanar sensors per axis won't be fooled in this way. Optical is still fooled by glass and transparent water on lakes and ponds in down direction.

You're quite right. What I meant to say is that they fail to warn about the issue of horizontal edges.

Link | Posted on Oct 2, 2019 at 14:36 UTC
In reply to:

Jwelz: If you've ever used a camera with an optical rangefinder, you would understand how stereo parallax allows you to distinguish distance to an object. You can't focus a horizontal rangefinder on a horizontal object or on objects with a repeating horizontal pattern. My Mavic Pro thinks a horizontal cable, window sill or roof edge is at infinity. Turn the drone 90 degrees so the stereo pair of cameras is perpendicular to such object and it can see the range. Objects at an angle to the stero pair are determined to be farther than they are the closer to horizontal they are. I don't use the collision avoidance. Only cameras using at least 3 coplanar sensors per axis won't be fooled in this way. Optical is still fooled by glass and transparent water on lakes and ponds in down direction.

Of course there's nothing in any DJI information or manual that warns about shortcomings of obstacle avoidance. There are further limitations with complex objects like bushes that overwhelm the processing capability of the avoidance technology. At least the Mavic Pro also has an acoustic sensor for the downward direction for altitude above ground measurement. At this stage of optical obstacle avoidance in consumer drones, there is not one offering that can't be fooled into a crash. We're not ready for these to be autonomous.

Link | Posted on Oct 2, 2019 at 14:12 UTC

If you've ever used a camera with an optical rangefinder, you would understand how stereo parallax allows you to distinguish distance to an object. You can't focus a horizontal rangefinder on a horizontal object or on objects with a repeating horizontal pattern. My Mavic Pro thinks a horizontal cable, window sill or roof edge is at infinity. Turn the drone 90 degrees so the stereo pair of cameras is perpendicular to such object and it can see the range. Objects at an angle to the stero pair are determined to be farther than they are the closer to horizontal they are. I don't use the collision avoidance. Only cameras using at least 3 coplanar sensors per axis won't be fooled in this way. Optical is still fooled by glass and transparent water on lakes and ponds in down direction.

Link | Posted on Oct 2, 2019 at 14:03 UTC as 14th comment | 4 replies
On article iPhone 11 vs. iPhone XR: What's the difference? (133 comments in total)

Apparently Apple power users watch video. Interesting concept of what constitutes a power user.

Link | Posted on Sep 20, 2019 at 14:57 UTC as 24th comment | 3 replies

IR blaster, user swappable battery, micro SD slot, FM radio (hence headphone jack), conformal coating water proofing and we can give it a 2nd thought. Same for Android world. For the time being, no one makes a phone I'd consider and the closest match is a several generation old used Android. Guess I'll keep my LG V20 for a couple more years. Not as water resistant as I'd like but, so far, so good.

Link | Posted on Sep 11, 2019 at 18:12 UTC as 72nd comment
In reply to:

cosinaphile: i suspect no sd slot ... i hope im wrong

edit elsewhere im reading it has a slot

if so sd + 3.5 jack+ 1.1.7 sensor giving appx 16 decent pixels + computational tricks + wide angle + fair price means this is the new everyman[and woman ] phone to have

with a camera that looks to be as impressive or more impressive than anyone

Waterproofed ipod nanos.

https://m.swimoutlet.com/p/waterfi-8gb-waterproof-ipod-nano-swim-system-33842

If done at a production stage, the cost would be less prohibitive. I suspect a conformal coating would be cheaper than adding gaskets and seals. The issue with the battery would be the terminals and connectors, but for a bit of cost, that too could be managed. Perhaps with a spot of wax or nail polish.

I just think the manufacturers are doing consumers a huge disservice with the sole goal of selling new phones because many or most buyers will replace their phone when the battery no longer gives adequate service despite the fact that there are few compelling new features in the latest model. Unfortunately, my one person boycott won't get me anywhere and the manufacturers have other ways of making older handsets obsolete. Remember how Apple slowed older iPhones to 'protect' older batteries?

Link | Posted on Aug 30, 2019 at 15:35 UTC
In reply to:

cosinaphile: i suspect no sd slot ... i hope im wrong

edit elsewhere im reading it has a slot

if so sd + 3.5 jack+ 1.1.7 sensor giving appx 16 decent pixels + computational tricks + wide angle + fair price means this is the new everyman[and woman ] phone to have

with a camera that looks to be as impressive or more impressive than anyone

I'm not budging until I get a user swappable battery as well. My LG G5 has IR blaster, FM tuner, micro SD slot, screen mirroring, microphone jack and spare batteries. A waterproof conformal coating on the electronics and it would be near perfect. I keep my no SIM LG G4 for flying my DJI drone as the version of DJI software doesn't crash on it like my G5.

Any phone I consider will require a specific feature list but no manufacturer makes a phone with faster electonics or a better camera AND has a user swappable battery. I may be in the market for a new or used G5 should I lose or destroy my current one.

Link | Posted on Aug 29, 2019 at 18:29 UTC
In reply to:

ToiletDuck: “Pilots” lol. Flying a remote control drone doesn’t make you a pilot.

A drone is capable of operating in airspace used by general aviation, commercial and military aircraft. Some knowledge of the rules governing that airspace is necessary so as not to mistakenly or ignorantly creating hazards to life. Pilot is apt as you require ground school to operate a 250 g (1/2 lb) one legally in Canada.

Link | Posted on Aug 18, 2019 at 03:14 UTC
On article Hands-on with the DJI Osmo Action (102 comments in total)
In reply to:

Fly18: @Jeanette D Moses

Since your site is targeting Global audience, I think it would make sense if you write the units in both, imperial and metric.

BTW, I live in the US.

Don't conflate Imperial with US measures. An Imperial gallon/quart/pint does not have the same volume as the US version. They differ in the number of ounces; 160 in the Imperial gallon vs 128 in the US. Better yet, the size of the ounces is actually different by roughly 4%. It's like a box of chocolates.

Link | Posted on May 16, 2019 at 14:49 UTC

Lots of the photos taken with a 1/2.3" sensor. A few with 1". DJI seems to be the universal theme here yet nothing taken with their Super 35 sensor X7 cameras. Still some damn fine images

Link | Posted on Mar 27, 2019 at 15:14 UTC as 15th comment | 2 replies
In reply to:

Bobthearch: We've known this was coming for some time. Combined with a variable aperture, cell phones can finally start competing with point-and-shoot cameras as photographic tools.

The real question now, how long will it take Apple to catch up?

It is probably easier to computationally emulate bokeh by using a single camera with an approach similar to Google Night Sight where multiple near concurrent images are merged. Bokeh mode would simply vary the focus distance setting and would allow a shorter total duration than required by the cumulative exposure needed by Night Sight.

In order to get optimum motion blur in video, it is necessary to get an appropriate frame rate based shutter speed, at least until computational power catches up to video data volume rates. Until then, you can adjust incoming light by attenuating it via aperture or filter blocking, using a non-optimum frame rate or shutter speed or by moving the sensor sensitivity gain away from its optimum setting. Aperture adjustment on a periscope type lens will probably mean going from tons of diffraction to even more hence I'm advocating variable filter attenuation.

Link | Posted on Jan 30, 2019 at 17:41 UTC
In reply to:

Bobthearch: We've known this was coming for some time. Combined with a variable aperture, cell phones can finally start competing with point-and-shoot cameras as photographic tools.

The real question now, how long will it take Apple to catch up?

About aperture control: why?

Given the typically tiny sensors, stopping the lenses down results in huge amounts of resolution robbing diffraction. Examples such as GoPro, Mavic Pro or Mavic 2 Zoom rely on ND filters to allow a modicum of control over shutter speed in video applications.

My Lumix LX3 and Nikon P1000 offer apertures down to F:8 but these smaller apertures on the respective 1/1.7 and 1/2.3" sensors perform more poorly than wide open. The LX3 bucked the megapixel growth trend by going with 10 mpx and newer Nikon has capped it at 16 largely due to diffraction realities.

A periscope lens puts severe restrictions on maximum aperture at longer focal lengths. I'd like to see a step wedge neutral density filter for phones but don't see a worthwhile advantage to adding aperture control at this stage of the evolution.

Link | Posted on Jan 27, 2019 at 17:13 UTC
Total: 71, showing: 1 – 20
« First‹ Previous1234Next ›Last »