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Forum: Flashes, Lighting, and Studio 06-14-2020, 11:35 AM  
Minolta, Pentax and Olympus Dedication the same?
Posted By THoog
Replies: 18
Views: 931
This is because no matter how many times you say that 1980s-era TTL and p-TTL are completely different technologies, people still confuse them. Pentax DSLRs later than the ist-DS simply do not support the older TTL method to tell the flash when to shut off. So the flash fires at full power, and the camera does whatever it does, and auto-exposure and auto-ISO introduce so many variables that it might appear to work.

I am not where I can get to my collection of Vivitar flashes, but I think I recall something like seven pins on the bottom of the M/P/O models. As Alex645 says, each brand had their own dedicated pin locations, and the Vivitar 550FD addressed this by having ALL of the pins for all of the supported brands. If Vivitar could have stuffed the pins for Canon, Nikon, and Ricoh in there without conflict, they would have made only one version of the flash, instead of two (M/P/O and C/N/R).

Edit: There are three versions of the 550FD - M/P/O, C/R, and N. Some of the other, non-TTL Vivitar flashes of the period only had M/P/O and C/N/R versions.


The answer is NO. Because each brand has their own "Flash Ready" pin, and that is the ONLY interface from the flash to the camera, a dedicated Minolta or Olympus flash is not going to send a ready signal to a Pentax. However, if the flash has a self-contained auto-mode, where the flash (not, Not, NOT the camera!) determines how much light it sees and shuts off automatically, then the center/FIRE pin on the hotshoe may be sufficient. You would have to ensure that the flash is ready before attempting to take a shot. That said, I have no idea if a dedicated Minolta or Olympus (or Canon or Nikon, for that matter) flash from this era would put signals on any other pins that might confuse a modern Pentax DSLR. The usual warnings about trigger voltages apply - I have never had problems with the 550FD/2800-D family, but the 2800 (different from 2800-D) is notorious for high trigger voltages.

But I will say it again: with this style of "dedicated" "automatic" flash, the flash is NOT changing the settings on the camera. You can move the sliders on the back of the 550FD until your fingers bleed, but the flash does not communicate anything to the camera other than "ready" - and how the camera reacts to that "ready" signal depends on the camera. The sliders on the flash are just a table of settings for you to manually change on the camera to get a usable exposure. The flash then provides what it thinks is the appropriate amount of light.
Forum: Pentax SLR Lens Discussion 06-10-2020, 05:45 AM  
Tripod collar for Pentax DA* 300mm
Posted By THoog
Replies: 16
Views: 1,032
I would just attach a quick-release plate, or something like that, to the OEM foot. Cheaper, and easier to find a size/shape to match your hand.
Forum: General Photography 04-21-2020, 06:50 AM  
Huawei caught using DSLR Photos to promote Smartphones
Posted By THoog
Replies: 16
Views: 1,132
This is some Futuristic photography tech. Find a great location, pull out your phone, and download a better picture than you would have taken. Brilliant!
Forum: General Photography 02-28-2020, 12:19 PM  
stay off the tracks 2, photographing
Posted By THoog
Replies: 14
Views: 930
I hate to disagree, but of all the zoos, museums, photo ops, and events I have shot in 35+ years, train events were the worst *by far* for photographers stomping in front of the "firing line" to get THEIR shot, or screaming at you from a hundred feet away because you wandered into their shot, or just general unpleasantness. And then there was the guy that was complaining loudly when I arrived because his favorite locomotive wasn't spotted where he wanted, complained as they rotated it to that very spot because it should have been there in the first place, and was STILL complaining about it hours later when I walked by him on the way to my car! It's all the social dysfunction of a comic book convention mixed with a bunch of grumpy old men.

So I guess my tips are; (1) Keep looking over your shoulder for the other guy (or trains!), (2) be patient, and (3) when you get your chance, shoot fast.
Forum: Mini-Challenges, Games, and Photo Stories 03-19-2020, 04:13 PM  
Thematic Silly Coronavirus "Self Isolation" Household images
Posted By THoog
Replies: 550
Views: 20,078
We were getting dangerously low on this critical material; a couple hours in the kitchen solved that problem (for now).
Forum: Pentax Film SLR Discussion 03-19-2020, 05:11 PM  
Pentax ME Super light leak?
Posted By THoog
Replies: 22
Views: 831
I had similar problems with the seals on my ME Super. It turned out to be the hinge, but it was somewhat unpredictable, depending (I think) on how well my right hand was covering the hinge. I replaced the seals and the problem went away. Vendee's suggestion to tape over the door joints as a test is a good one.
Forum: Mini-Challenges, Games, and Photo Stories 03-19-2020, 04:33 PM  
Thematic Silly Coronavirus "Self Isolation" Household images
Posted By THoog
Replies: 550
Views: 20,078
Nobody said lasagna had to be pretty - which is good, because that would be 'WAY beyond my culinary abilities...
Forum: Photographic Industry and Professionals 03-12-2020, 06:48 PM  
NAB 2020 is cancelled
Posted By THoog
Replies: 30
Views: 1,221
I'm afraid I have to agree - in the first week of cases here, our state health department only found out about them when they were notified by other states (who had patients who had been in contact with ours). In one of those cases, the individual was in northern Italy, had a fever for two days, then came home, apparently without telling anyone. Even if I am generous and say he didn't know northern Italy was a hotspot for Covid-19 when he was there, it would have been pretty hard not to know by the time he got home. But human nature is going to say "I want to get home, therefore I am safe to travel", then "I don't want to be inconvenienced/stigmatized, therefore I didn't have the corona virus and don't need to tell anyone."
Forum: Pentax Film SLR Discussion 03-05-2020, 07:26 AM  
Pentax MV shutter speed
Posted By THoog
Replies: 14
Views: 655
I don't think that focal length comes into play at all. The light meter produces a voltage according to how bright the light is, and a simple circuit (probably something like a ladder of diodes) sets the shutter speed according to that voltage. If the selected speed is 1/60 or higher, the green light is also lit. If less than 1/60, the red light is lit.

The circuit is more or less the same as the ME Super in "Auto" mode; it just doesn't tell you what speed it is selecting.
Forum: Pentax SLR Lens Discussion 03-01-2020, 12:38 PM  
SMCP-DA 21mm f3.2 vs HD DA 21mm F3.2
Posted By THoog
Replies: 17
Views: 1,182
The SMC version produces better "stars" from light sources (think streetlights at night). The HD version is a little more flare-resistant. So, obviously, you should buy one of each. :lol:
Forum: Pentax K-01 02-02-2020, 07:45 AM  
Happy Birthday to the K-01!
Posted By THoog
Replies: 130
Views: 21,551
Forum: Pentax K-01 03-27-2018, 04:41 AM  
Happy Birthday to the K-01!
Posted By THoog
Replies: 130
Views: 21,551
Five: Basic Black, Black/Yellow "Bumblebee", White/Black "Panda" (not sold in Europe), Silver/Black (only sold in Europe), and While/Blue "Smurf" (2013 limited issue in Japan only).

And you clearly haven't read through the entire thread: :lol::D:lol:

Forum: Pentax K-01 02-01-2019, 10:29 PM  
Happy Birthday to the K-01!
Posted By THoog
Replies: 130
Views: 21,551
It's time again! Seven years of unorthodox grips and occasionally banging the camera into your forehead!

Forum: Pentax News and Rumors 07-04-2013, 05:13 AM  
pentax k-01 white and blue version
Posted By THoog
Replies: 236
Views: 26,716
I thought it was agreed long ago that I'm not in my right mind...

Forum: Pentax SLR Lens Discussion 02-18-2020, 04:49 PM  
M42 adapter problems
Posted By THoog
Replies: 15
Views: 691
The screw for the spring is actually one of the biggest problems on the cheap adapters - it should be just about flush, but is frequently sticking out where it can snag on the mount. Besides the spring, the machining on the cheap adapters is frequently not as good as the genuine Pentax. Check for burrs on the ends of the bayonet flanges. You may also want to compare the flanges to a K-mount lens to make sure they have been machined to the correct widths. If you have removed the spring and screw, and there is any sort of scraping sound/feel when installing the adapter, something is sticking out and needs to be removed.
Forum: Pentax K-70 02-01-2020, 08:12 AM  
Original Battery Supplied with a new K-70 vs a Non-Pentax Battery
Posted By THoog
Replies: 13
Views: 853
Unlike some other makers, Pentax has never made their camera bodies look for a chip to detect OEM batteries. Not working with 3rd-party batteries just isn't an issue with ANY Pentax model. You might see listings for batteries "chipped for Pentax" - that just tells you that the seller doesn't know what they are talking about and re-used the text from a listing for a Nikon battery.
Forum: Pentax DSLR Discussion 02-03-2020, 07:17 PM  
Why Bulb on modern cameras
Posted By THoog
Replies: 20
Views: 1,179
And fireworks - open the shutter as the shell goes up, close when the burst is at maximum size.
Forum: Pentax SLR Lens Discussion 02-01-2020, 02:20 PM  
One or the other need help on a 55-300 zoom lens??
Posted By THoog
Replies: 32
Views: 1,490
The older 55-300 (not PLM) was regarded to be optically one of the best "consumer" zooms in that range, and the PLM is generally considered to be as good or better, so the decision really comes down to the cost difference and whether you are going to use the lens on an older body that can't support the PLM. My 55-300 hasn't done me the favor of falling 14 floors :lol: or I would have probably replaced it for the faster focusing speed. (The KP has a stronger screwdrive motor than older bodies, which helps the older 55-300 in that regard).
Forum: Pentax K-30 & K-50 01-31-2020, 05:00 PM  
Third Party AA adapters
Posted By THoog
Replies: 17
Views: 1,040
I've never had a problem - but I paid extra for quality and got the six-dollar adapters. :lol:
Forum: Pentax KP 03-12-2019, 11:33 AM  
Does anyone try the video mode on KP?
Posted By THoog
Replies: 25
Views: 2,514
If you are hoping that Pentax will add those video modes to the KP via firmware, that's just not possible. The video modes are built into the PRIME/Milbeaut image processor, which Pentax buys from SocioNext. Pentax designs an interface to use the built-in modes, but that is all they do. The existing 2-core Milbeaut designs don't have the processing power for 1080p60 or 1080p120 (or else SocioNext would be selling them as such). By comparison, the FujiFilm X-T3 is using a quad-core processor, probably running at a faster clock speed.
Forum: Pentax SLR Lens Discussion 12-14-2019, 10:36 AM  
Lens cap for 10-17 fisheye
Posted By THoog
Replies: 18
Views: 718
Since the 10-17 was also sold by Tokina in other mounts, I did a search for replacement lens caps for that, and found a thread where the B+W 60mm plastic push-on cap is reported to work well. I think it is around six dollars at B&H. I'm tempted to try it just because my metal cap likes to come off and rattle around the bag.

Edit: It looks like the cap is sold by B+W, but every picture of the cap has the Schneider-Kreuznach logo molded into it. Since my 10-17 is actually the Samsung-badged version, and Samsung paid Schneider-Kreuznach to use their name on lenses (even though neither Samsung nor Schneider-Kreuznach had anything to do with the design), I guess I have to buy one now. :lol:
Forum: Pentax SLR Lens Discussion 10-04-2019, 05:12 PM  
Focal length = focal length, I know . . . . . . . . . . BUT
Posted By THoog
Replies: 131
Views: 3,650
Part of the confusion in all this is that the term "equivalent" is usually shorthand for "equivalent field of view on a 24x36 Full Frame 35mm sensor". Keep in mind that the field of view is a function of focal length AND the sensor. When you bring other sensors into the conversation, you really need to specify which sensor you mean.

To edit your question a little:


As others have said, the type of lens just changes the size of the projected image circle. It does not change the focal length of the lens. So the equivalent field of view would be 225mm on a 24x36 Full Frame 35mm sensor.



You aren't wrong, you just didn't keep in mind that the sensor is different in each column. 450mm is the equivalent field of view on a 6x7 sensor, but only on that sensor. On the 24x36 35mm "Full Frame" sensor, it is 225mm.
Forum: Pentax SLR Lens Discussion 10-02-2019, 06:47 AM  
SMC Pentax-DA 21mm F3.2 Limited - Is it fixable?
Posted By THoog
Replies: 18
Views: 806
I repaired mine using the above-mentioned forum threads, and it was surprisingly easy. I still haven't reinstalled the stick-on data / beauty ring, not trusting my own work, but it has been a couple years, so I guess I should do so.
Forum: Pentax Camera and Field Accessories 05-25-2019, 04:30 PM  
Wireless receiver for Yongnuo flash
Posted By THoog
Replies: 9
Views: 678
I have the YN585, and it does not have a radio receiver. It's "wireless" capabilities are optical only. The RF-603 will not trigger it, unless you use *two* RF-603s and treat the YN585 as a completely manual flash with no P-TTL.

I also have a small collection of YN560 IIIs (manual flash with radio receiver) and RF-603Ns. I use them when I need range or multiple flashes, and the YN585 when I need P-TTL.


Futile attempt to head off the "Yongnuo is stupid for not making the YN585 both P-TTL and RF-603 compatible" posts: So far, YongNuo has only made ONE flash that worked with both their RF-603 system and an OEM system (the YN968N for Nikon). I think the YN585 was them dipping their toe in the Pentax world to see if we were worth bothering with. It's a minor miracle that they did that much. Given the amount of negativity at the YN585's release because YN didn't go all-in on the first try, I doubt we'll ever see something like a YN968P.
Forum: General Photography 04-18-2019, 07:57 PM  
Engadget on SLR vs Mirrorless
Posted By THoog
Replies: 11
Views: 1,068
MILCs will replace DSLRs in two years - or so I've been told every year for the past ten years.
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