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Forum: Photographic Industry and Professionals 2 Hours Ago  
Disturbing news about an important photojournalist ...
Posted By DeadJohn
Replies: 18
Views: 1,160
After the original article was posted, the Chinese government reportedly confirmed he was arrested. No info about the charges.

When pressed, I expect they will eventually cite "terrorism" and "state secrets".
Forum: Pentax News and Rumors 17 Hours Ago  
Hints about future products on Twitter
Posted By DeadJohn
Replies: 52
Views: 3,166
if you want a more expensive option, that's what the 2nd link I posted does. You can find other sellers who charge more for it.
Forum: Pentax News and Rumors 22 Hours Ago  
Hints about future products on Twitter
Posted By DeadJohn
Replies: 52
Views: 3,166
I wonder why Ricoh thinks it necessary to build this into a lens. There are already inexpensive, easy to use options that work with any lens.

Hand warmer packs. Disposable, no electricity required. Use a rubber band to hold this against the side of the lens. https://www.amazon.com/HotHands-Hand-Warmers-Odorless-Activated/dp/B0007ZF4O...-20&th=1&psc=1

Dew heater. Reusable, needs battery power. amazon.com : PROTAGE Condensation Prevention Lens Heater Evening dew Remover USB Warmer P-LH02 : Camera & Photo?tag=pentaxforums-20&
Forum: Pentax SLR Lens Discussion 4 Days Ago  
Show me your 28-105 Wide Open Shots!
Posted By DeadJohn
Replies: 16
Views: 593





QuoteOriginally posted by BruceBanner Quote

Is 28@f3.5 really decently sharp? What's the bokeh like? Anyone done a portrait shot at this length? ... how do people find the size and bulk of the lens? Is it annoying or pretty decent?[



Yes, the 28-105 is sharp at f3.5. Overall image quality is excellent. The only reason I use other lenses is to go wider than 28mm, longer than 105mm, and occasional forays into thin depth of field, macro photography, and handheld very low light. Have you seen this review? HD Pentax-D FA 28-105mm F3.5-5.6 ED DC WR Review - Introduction | PentaxForums.com Reviews

Most of my photos are landscape, architecture, and astro so I've never carefully evaluated the bokeh nor done portraits with it. I've done some semi-macro shots at 105mm (approx 1:4 magnification) and would say the bokeh is unremarkable, nothing great but nothing objectionable.

The size and bulk are quite good for a full frame zoom. It feels well matched to the K-1 and I've done long hikes with the combo. Granted, it's a bigger lens than some of the single focal length options you listed up top.

Here's a sample at the 28mm f3.5 you requested. The stars are sharp across the frame. The corners are good; there's some star trailing visible upper-right but that's sky movement not the lens' fault.
Andromeda Galaxy above Thunderstorms by jvsperoni, on Flickr
Forum: Pentax DSLR Discussion 4 Days Ago  
And people wonder why DSLR sales are declining...
Posted By DeadJohn
Replies: 131
Views: 3,512
I agree on the wifi points. Regarding batteries, mobile phones are a bad model to copy. Too many mobile phones have non-serviceable batteries.


Removable batteries let us continue photographing without a powerbank dangling from the camera. And, after a battery dies due to age, I don't want to ship my camera to Precision for a $300 battery replacement.
Forum: Photo Critique 6 Days Ago  
People Platicando
Posted By DeadJohn
Replies: 3
Views: 296
The exposure and contrast look good to me, no need to change those. Composition is good, too.


The guy on the left edge definitely adds to the photo. He's blurred, so doesn't distract from the main subjects, yet I can still make out his expression. He adds depth to the photo and leads me to wonder what he's looking at.


The guy on the right is less interesting but still acts to frame the main subjects.

The bright vertical line of wall moulding near upper-right is a slight distraction. Maybe experiment with a squarer crop to get rid of that, but it then introduces a new problem because you'll lose the right guy's head leaving a disembodied shoulder. It's still a good photo, whether left as-is or cropped. Do not crop out the left guy.
Forum: Pentax SLR Lens Discussion 6 Days Ago  
It's a Mad, Mad, Mad World
Posted By DeadJohn
Replies: 23
Views: 1,249
In that context, if you already have the 24-70 there's no need to add the 28-105. The only benefits would be if you wanted a lighter lens or if you frequently needed the 70-105 range.

70mm cropped is *not* the same as 105mm. It's a similar field of view but you ignore half the pixels on your sensor. If you still have enough resolution and images are low noise enough, sure, go ahead and use crop mode and you can get good photos.
Forum: Pentax SLR Lens Discussion 6 Days Ago  
It's a Mad, Mad, Mad World
Posted By DeadJohn
Replies: 23
Views: 1,249
In crop mode you are discarding half the megapixels you paid for. For fair comparison between lenses, in crop mode the 28-105 gives the same field of view as 158mm.

The 24-70 and 28-105 are both good lenses. If you need f2.8 or the 24-28mm range, buy the 24-70. If you need more than 70mm, prefer a less bulky lens, or want to save money, buy the 28-105.

In my experience, mostly landscapes and general photography, rarely portraits, the 28-105 works best for me. I'm usually shooting landscapes at f8 through f/16 so I don't want to carry the extra weight of f2.8. For wider than 28mm I have other lenses.
Forum: Pentax K-70 6 Days Ago  
Live View Auto Focus issues?
Posted By DeadJohn
Replies: 11
Views: 374
The K-5 has slow optical focus and even slower live view focus. The K-3 has faster optical focus, while live view is still slow, so it feels like there's a bigger difference in the 2 modes.
Forum: General Photography 12-09-2018, 05:28 PM  
Pentax stars in blockbuster movie
Posted By DeadJohn
Replies: 19
Views: 1,085
Are you running the Privacy Badger browser add-in? That might break the video in the top post. Or maybe it's another browser issue.


Right click the video, pick "Copy video URL", then open a new browser tab and paste the copied URL.
Forum: General Photography 12-09-2018, 05:22 PM  
Pentax stars in blockbuster movie
Posted By DeadJohn
Replies: 19
Views: 1,085
The movie is based on this real story. Marwencol
Forum: Pentax Camera and Field Accessories 12-08-2018, 11:01 AM  
Tripod head for astro/DSO photography?
Posted By DeadJohn
Replies: 16
Views: 416
You could try a geared tripod head. It offers finer control than unlocking a ballhead and manually recomposing every few frames.

Here's just one of many options: https://www.manfrotto.us/405-geared-tripod-head-strong-and-lightweight-aluminium
Forum: Pentax Price Watch 12-07-2018, 11:37 PM  
12 days of Pentax holiday deals @ the US Ricoh Web store
Posted By DeadJohn
Replies: 64
Views: 3,135
The day #4 "special" is binoculars for $50. Same binoculars are $40 new at EBay, $30 at Amazon.
Forum: Site Suggestions and Help 12-06-2018, 06:35 PM  
Question A deleted thread?
Posted By DeadJohn
Replies: 7
Views: 245
Ok, that's just the first time I ever noticed a derailed thread erased instead of just closed. I've occasionally wanted some of my own threads erased ;)
Forum: Site Suggestions and Help 12-06-2018, 11:24 AM  
Question A deleted thread?
Posted By DeadJohn
Replies: 7
Views: 245
A thread seems to have gone missing about the Ricoh "12 days" sale. I don't remember the thread title but I think it was in the Price Watch forum, and I know I posted to it so it should show in my subscribed threads. I'm not finding it after searching several ways.


Did the thread go away due to some technical error? That's the main reason why I'm posting this, since if one thread vanished by error others might be gone, too.


I suppose it's possible that I was moderated out of that thread and banned from even seeing the thread, but I didn't receive any warning PMs.
Forum: Photographic Industry and Professionals 12-03-2018, 12:48 PM  
Next Photokina is May 2020, 2019 was cancelled
Posted By DeadJohn
Replies: 10
Views: 992
Seems like bad planning on their part. It was easily foreseeable that, for an event previously scheduled ever 24 months, jumping to a one-time 7 month interval would get low turnout.

Large trade shows are expensive to do correctly. Floor space, custom booths, shipping, staffing, hotels, airfare, etc.
Forum: Digital Processing, Software, and Printing 12-02-2018, 07:18 PM  
LR import trouble with new K1
Posted By DeadJohn
Replies: 10
Views: 502
Which operating system, Windows?

Do you see the files if you manually browse to the card?

How are you starting the import? Are you inserting the card into a reader and auto-importing, or manually starting it from LR?
Forum: Welcomes and Introductions 12-02-2018, 02:18 PM  
Hello from White Plains NY
Posted By DeadJohn
Replies: 18
Views: 367
I did some contract work for Westchester County GIS while you were there. I was working off-site (with a company called Bowne Management Systems) so I'm certain we never met. I'm with New York City government now.
Forum: Welcomes and Introductions 12-01-2018, 09:00 PM  
Hello from White Plains NY
Posted By DeadJohn
Replies: 18
Views: 367
Welcome from downstate.

Municipal GIS: I did GIS consulting for towns, counties, and utilities in your vicinity. That was over 18 years ago and I'm only tangentially involved with GIS now, but I wonder if we ever crossed paths.
Forum: Sold Items 11-28-2018, 02:23 PM  
For Sale - Sold: (Price reduced AGAIN) Tamron 10-24mm f/3.5-4.5 SP AF Di II lens for Pentax
Posted By DeadJohn
Replies: 13
Views: 1,132
Free bump.

I recently sold my 10-24 because I haven't used ultrawide APS-C since getting K-1 with 15-30. Note that the 10-24 is usable full frame in the 15-24 range.
Forum: Pentax SLR Lens Discussion 11-28-2018, 11:07 AM  
DA15 for hiking?
Posted By DeadJohn
Replies: 24
Views: 969
I have both the Ricoh GR and DA 15. They are both good for hiking. If bringing a single camera+lens I prefer the GR because 18mm is a more generally useful focal length than 15mm(*). When 15mm works, though, it works very well.

The DA 15 offers better color and flare resistance than the GR. That's not to say the GR is bad, it's just that the DA 15 is even better.

The GR offers better sharpness. GR corners are very sharp even at f2.8. The DA 15 corners are weaker, but acceptable especially considering that most landscapes are stopped down a bit.

(*) 15mm is significantly wider than 18mm. It's only 3mm but you can be surprised by how much that matters at the wide end. Note that I avoided converting to the oft-cited and oft-confused "35mm equivalence" because your GR and K-3 are both APS-C sensors.

DA 15 Example (mounted on K-5)
Sunset over Pueblo del Arroyo by John Speroni, on Flickr



Ricoh GR Example

20160507-R0002869_HDR.jpg by John Speroni, on Flickr
Forum: Photographic Industry and Professionals 11-28-2018, 09:54 AM  
Could this be the in the Pentax K1 mark3
Posted By DeadJohn
Replies: 74
Views: 4,185
Forum: General Photography 11-27-2018, 10:39 AM  
truth time
Posted By DeadJohn
Replies: 28
Views: 900
Human expressions are dynamic. A single frame taken during laughter can look like insanity. A single frame taken mid-blink can make someone look sleepy or stoned.

Good editors should avoid such frames, but some news outlets and political organizations are especially prone to selecting extreme photos.

Forum: Troubleshooting and Beginner Help 11-27-2018, 10:20 AM  
Samyang 24mm 1.4 decentered?
Posted By DeadJohn
Replies: 9
Views: 450
^ your copy is even worse than my 2 bad copies were.

All these bad copies make we wonder just how widespread the problem is. Are there a lot of good copies on the first purchase that people just don't post about? Or do a lot of Samyang/Rokinon buyers not notice the problem until it's too late to return a bad lens? Or does Samyang accept a high level of returns as the cost of doing business, and still makes a profit despite all the bad copies?

...just wondering, Samyang will never release data, and anything compiled via PF will be anecdotal.
Forum: Troubleshooting and Beginner Help 11-26-2018, 11:50 AM  
Samyang 24mm 1.4 decentered?
Posted By DeadJohn
Replies: 9
Views: 450
Yeah, your copy is a dud. Exchange it and there's maybe a 50% chance of the next one being good. A properly assembled copy should be quite good but it's difficult to find one.

The 24/1.4 seems especially prone to assembly errors. This applies whether it's labeled Samyang, Rokinon, or Bower. All 3 companies come form the same factory.

I'm curious what the center of your bad copy looks like. My 2 bad copies were bad in the center as well as the corners. It seemed like something more significant than typical "decentering".
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