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| bio | website | pfarrell.com |
|---|---|---|
| location | outside Washington DC | |
| age | 62 | |
| visits | member for | 1 year, 3 months |
| seen | 3 hours ago | |
| stats | profile views | 147 |
Programming since punched cards
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Feb 23 |
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A good library-less photo manager for Mac? What does your "photo manager" do if it doesn't manage the library? Do you mean a photo editor like Gimp or Photoshop? Lightroom will allow you to manage your own photos, but most people let it do the image managment and file placement. |
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Feb 21 |
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What is the upgrade path for Nikon D300 with better low light sensitivity? plus he'd need one of those $$$ 200mm F2.0 |
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Feb 21 |
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What is the upgrade path for Nikon D300 with better low light sensitivity? His primary sport is volleyball. The obvious action happens at one of two places right at the net. He's the coach, so he has nearly complete access, but as coach, he also has limited time for photography. |
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Feb 20 |
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What is the upgrade path for Nikon D300 with better low light sensitivity? He already has some F2.8 glass. Its sports, so fast focusing is fairly important, but with a bit of planning, you can prefocus on where the action will be. Fast primes work well for most of the time, zoom with your feet. |
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Feb 20 |
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What is the upgrade path for Nikon D300 with better low light sensitivity? It looks like the D5200 is the current DX leader, but I'm not sure. It seems to have at least one stop more usable ISO according to dxomark.com/ |
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Feb 17 |
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If I have a recent, mid-range DSLR, then why, if ever, would I need to buy another / better focusing screen? I just ordered a new focus screen for my Canon 50D. I have always hated the standard screen, its impossible for me to use to manually focus. I much prefer manual focus. I followed the links in this posing and found a Taiwan firm that still offers a nice split prism for the 50D. Great news. |
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Feb 12 |
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Do any DSLRs offer in-camera file encryption? I commented way up at the top that I believe, for good and sound reasons that a DSLR will never have good security. A Smartphone, sure. PKI is about Public Key Infrastructure, which is only useful with RSA. There are no other practical public key ciphers. My problem with a DSLR cipher is not the cipher, but the passphrase to keep the private key secure (or if you like, the private key itself). Its isomorphic. Keep the key secure, or enter the key. And there are not enough buttons on a DSLR to do it credibly. The conversation has been done a long time. |
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Feb 10 |
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Do any DSLRs offer in-camera file encryption? @jrista, then you are showing some naive concepts about how real world crypto works. And if the folks who need the security are worried about ISI, Savak, KGB, etc. they had better be using stuff designed by pros. Its not that RSA is bad, its that it solves zero problems in this space. To solve the real problem here, you need a symmetric cipher. Again, this is not a crypto forum. Here is an article about some of the problems with passwords. arstechnica.com/security/2013/02/… |
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Feb 9 |
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Do any DSLRs offer in-camera file encryption? @jrista, this use case does not need or justify public key cryptography. Folks seem to think that RSA is the best cryptography. This is simply not correct. RSA solves a very serious problem: key management when the two parties are not in secure communications. But all real world RSA implementations use symmetric crypto. This use case simply needs a good symmetric cyptro, it can skip the RSA and be better. |
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Feb 9 |
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Can you recommend a good budget prime lens for family photos (Canon mount) +1 on the 50mm. Only warning, on your T3, it will be a bit long for many group photos indoors. Unless you have fairly big rooms in your house. It will be great for taking photos of one or two kids, wife + one, etc. but you may find that the kit lens comes in handy when you want to have big groups in the photos taken indoors. |
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Feb 9 |
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Can information like a signature, secret key or password be encoded in a photo? Yes, photos on the web can be copied. Nothing will change that. If you have registered your photos with your country's copyright office, then you can use the law to go after folks who violate your copyright. Just put your copyright message in the EXIF and register your photos. Don't expect to use technology for a legal problem. |
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Feb 4 |
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Can I use a Nikon 50mm f/2 pre-AI on my Nikon D5100? The F/2 was a low end lens when new. If it were the F1.4, it might have some value/interest. I'd simply buy a current F1.8, they are very very inexpensive. Some modern bodies won't mount a pre-AI lens, because the coupling prong interferes with the pentaprism. Converting some pre-AI lenses may make sense, but not the F2 |
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Jan 30 |
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What is the difference between Canon's Remote Switch and Remote Control? With the remote shutter controls that I have, they work exactly like the main shutter. You press it half way down, and the autofocus works. Press farther, and it snaps. |
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Jan 30 |
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Do any DSLRs offer in-camera file encryption? Again, this has nothing to do with photography. "your key" has to be strong and a secret. You can't enter that on a camera. One a smartphone, OK, that will work. I don't agree that its "meaningful" in this case as the ISI, KGB, Savak, etc. will simply arrest you for having encrypted data. |
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Jan 29 |
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Do any DSLRs offer in-camera file encryption? The third option would be to encipher the photo with your public key, which requires your private key to later use it. Since your editor/publisher doesn't have your private key, and you will never give it to him. Obviously, with #2, you need the private key on the camera, and I maintain that there is no practical way to enter it on a camera. What you want is to use the -c switch to GPG/PGP, but that too requires you to enter a strong pass phrase that can't be brute forced. I'd rather go into details with @matt privately, then we can go public once we are on the same page. |
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Jan 29 |
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Do any DSLRs offer in-camera file encryption? I think this doesn't belong in a photography forum because it dives down into the nits of cryptography. But I think @matt's approach is technically incorrect. A comment can't go into the needed details. You could encipher the photo with your publisher or news editors public key. You would then not need any private keys. But you also could not read the photos, so you could not run them through Lightroom, Aperture, etc. to improve them for publication. Or second, you could encipher the photo with your own private key, which anyone with your public key could see it, which will send you to jail. |
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Jan 29 |
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Do any DSLRs offer in-camera file encryption? @matt, this is really the wrong place. You've got a few details wrong. I'll answer your emails, but nothing more here. |
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Jan 28 |
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What laptop specs are important for intensive image editing work? While in the past, on-board graphics were not close to good enough, the recent releases that are "unified" from both AMD and Intel actually are good enough for mid-level work. Of course, as Tim the Toolman says "more power, must have more power" |
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Jan 28 |
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Do any DSLRs offer in-camera file encryption? How do you keep the secret key? Its thousands of bits long, encoded in a really ugly format. Yes, the photographer has to worry about his passphrase for a symmetric. With RSA, you have to remember the passphrase that locks up the secret key. RSA is wonderful but not helpful in this use-case. So you have to remember the passphrase and enter it in both the symmetric and the RSA case. RSA brings you nothing. Please lets take this off the forum. email me, pfarrell@pfarrell.com |
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Jan 28 |
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Do any DSLRs offer in-camera file encryption? Sadly, no. You can't make it less tedious because you can't trust the link between the camera and smartphone. This is a fundamental security design issue. |
