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Forum: Pentax K-5 04-20-2019, 09:17 AM  
K5 heat exposure may cause ISO to get stuck on higher setting even when dialed lower
Posted By BB_Zone28
Replies: 4
Views: 609
"RC", you're comment is correct. Heat damage apparently made the lowest obtainable actual ISO response, regardless of lower dialed in values, become stuck at approximately ISO 1600, or said another way, dialing down the "ISO setting" below the ISO 1600 number didn't reduce the actual exposure response of the camera as you should expect when reducing the ISO setting. :mad:

The combined set of exposure settings (shutter, aperture, ISO) recommended by the camera meter presumed the lower ISO setting, but the image would be overexposed. The camera's meter and image exposure results only seemed to work correctly once I dialed in ISO 1600 or higher. :(

---------- Post added 04-20-2019 at 10:20 AM ----------



"UV", you've explained it in the most simple and clear manner!!! :cool:
Forum: Pentax K-5 03-25-2019, 10:54 PM  
K5 heat exposure may cause ISO to get stuck on higher setting even when dialed lower
Posted By BB_Zone28
Replies: 4
Views: 609
This is a follow up to a much earlier post on another thread, so hopefully what I've learned may be useful "words to the wise" so to speak.

Over a year ago I apparently stumbled onto what likely caused my original K5 to get effectively stuck at a higher minimum ISO setting regardless of dialing in lower ISO settings. It happened after buying a K5II to supplement my original K5 a couple of years ago.

One day I forgot and left the K5II in the front seat of my car on a warm day. The K5II was very warm to the touch, but not extremely hot and when I was out later that day shooting with it I noticed it was overexposing everything at ISO 100 and had to turn the dial up to about ISO 1600 to get better-but-slightly-clipped highlights. :mad:

I was dreading the thought that this may have been what really caused the problem with my original K5 and now I've done it to my K5II also. :(
However, after sitting for several days indoors at normal temperatures the K5II settled down and returned to "normal" performance regarding ISO settings. Apparently the K5II was able to recover from a single heat exposure event. :cool:
Now I'm very careful to not to do that again. :)

That led me to suspect the reason my original K5 is stuck at roughly ISO 800- 1600 "minimum ISO" even when dialing in lower ISO settings was probably due to leaving it in my car during a summer for a few weeks while driving around town and parking in various place, even though the camera was in a bag in the back floor board covered from direct sunlight. :(

I'm not sure what actually happened internally to the camera to caused the end result observed with the effective ISO minimum setting. My guess is the heat exposure possibly caused something to happen within the sensor electronics to affect the gain settings that track along with the dialed ISO setting??? :confused:

CONCLUSION: Heat exposure inside a car is most likely what caused my original K5 to become permanently stuck at a higher "minimum ISO setting," although dialing in higher than ISO 1600 settings still seem to boost ISO like you would expect, it just won't return to the lowest ISO settings when dialing it below about ISO 800-1600. :o
PS: In case anyone was wondering, noise performance appears to be about the same as it was before heat exposure, so the original K5 has basically become a dedicated night/low light DSLR. :)
Forum: Repairs and Warranty Service 06-09-2017, 01:35 PM  
Need tips for Pentax ME Super back film door removal & replacement
Posted By BB_Zone28
Replies: 2
Views: 1,066
Thanks Steve! That was really easy to swap the back doors!!! :):D:)

Bruce
Forum: Repairs and Warranty Service 06-09-2017, 01:16 PM  
Is an old Spotmatic worth fixing?
Posted By BB_Zone28
Replies: 10
Views: 1,563
Thanks! I did a search and found his interview on PF. It sounds like he's well qualified to fix a Spotmatic!!! :D

I should probably check out the meter to see if it's still ok before I decide one way or the other to tinker or send it in!!! :)
Twenty Questions with Eric Hendrickson - Columns | PentaxForums.com
Forum: Repairs and Warranty Service 06-09-2017, 10:53 AM  
Need tips for Pentax ME Super back film door removal & replacement
Posted By BB_Zone28
Replies: 2
Views: 1,066
Hi, I have a Pentax ME Super SE with a back film door that has a lot of worn off paint around the edges.

I also have another Pentax ME Super that the film advance is now having problems "catching" to advance the film unless you try it over and over and over. The door on it is in excellent condition. So I'm thinking about taking the back off of it and putting it on the Pentax ME Super SE since they are both black in color.
It also has a much nicer and cleaner base that I'll probably swap also to make the one camera look much nicer again.

Upon looking at the hinges on the door, it doesn't look like it should be that hard, but also is not obvious to me how to do it!
Does anyone have some useful tips on how to properly and easily remove the back film door?
Forum: Repairs and Warranty Service 06-09-2017, 10:36 AM  
Is an old Spotmatic worth fixing?
Posted By BB_Zone28
Replies: 10
Views: 1,563
I have an old black Asahi Pentax Spotmatic that the shutter now only works at faster settings, not slower ones. I wonder if it's worth trying to get fixed as it may cost more than its worth? It's been sitting around for a long time now. The condition isn't beat up, but it's not like new either. It has a silver add-on accessory shoe.
Thanks
Forum: Pentax DSLR Discussion 03-19-2016, 04:31 PM  
Life expectancy of K5
Posted By BB_Zone28
Replies: 10
Views: 2,736
I've been shooting my K5 mostly at night using ISO 1600 in Manual mode with an SMC Pentax-F 50mm f/1.7 lens attached. I think it was after camera had been on those setting for nearly a year that now the ISO setting is stuck and will not change even when it is adjusted via ISO button/control down to ISO 100. (I have a K20D and a couple of older Canon DSLRs I use also, so I mainly use the K5 for night work) I've removed batteries, set to ISO 100 and switched it on and off several times over the course of a few weeks and stays stuck at high ISO setting regardless of what setting I adjust it to via the ISO controls. It does seem to drop down to maybe ISO 800, but other than that it's working great in low light at ISO 1600.
Forum: Pentax Film SLR Discussion 03-31-2014, 07:12 PM  
First 2nd Curtain Sync - History Question
Posted By BB_Zone28
Replies: 6
Views: 1,094
Good point! That's why I listed both the SLR camera model and flash model together in my comments regarding 2nd curtain sync.
Forum: Pentax Film SLR Discussion 03-31-2014, 03:39 PM  
First 2nd Curtain Sync - History Question
Posted By BB_Zone28
Replies: 6
Views: 1,094
That helps. I downloaded the AF400Ftz manual. It shows a leading/trailing curtain switch.
So, based on this info for the SF1(1987) & AF400Ftz(1987), we know that 2nd curtain sync was at least available in 1987, if not before, or maybe this is where it all began for Pentax.

---------- Post added 03-31-2014 at 05:08 PM ----------

Regarding 2nd curtain sync, I just found this quote on Wikipedia for the 1986 Canon T-90 & 300TL flash "The T90 became the first mass-market camera to support second-curtain flash, where the flash fires at the end of the exposure, just before the second shutter curtain starts to close."

So, I'm concluding that the following year, 1987, with the release of the SF1 & AF400FTZ was the first Pentax with 2nd curtain sync.:)
Forum: Pentax Film SLR Discussion 03-31-2014, 02:07 PM  
First 2nd Curtain Sync - History Question
Posted By BB_Zone28
Replies: 6
Views: 1,094
I had been looking through his info, but the 2nd Curtain Sync feature isn't referenced in his specifications charts for cameras or flashes.
Forum: Pentax Film SLR Discussion 03-31-2014, 12:45 PM  
First 2nd Curtain Sync - History Question
Posted By BB_Zone28
Replies: 6
Views: 1,094
Anyone here know when and what model(s) of Pentax camera & flash were the first to offer 2nd Curtain flash sync feature?

From the info I've found so far, it appears the F series flashes may have been the first with 2nd Curtain sync capability, but in the AF SLR camera database this feature isn't mentioned.

A secondary question would be who (other brand than Pentax?) offered the very first 2nd Curtain flash sync feature for any camera system?
Forum: Pentax Price Watch 05-28-2013, 12:46 PM  
K-5 Dual-Lens Bundle Price Drop - $889
Posted By BB_Zone28
Replies: 4
Views: 2,098
Tempting, but doesn't the K-5 II and K-5 IIs being out for awhile now make it harder to consider buying a new K-5? Especially since the K-5 is an older model and to resell it used later on will drop even faster in value?
Forum: Monthly Photo Contests 04-24-2013, 11:21 AM  
Bouquet bokeh
Posted By BB_Zone28
Replies: 1
Views: 567
Funny title! Do you remember what was in the distant background to make that pattern?
Forum: Monthly Photo Contests 04-24-2013, 11:14 AM  
Dreaming with open eyes.
Posted By BB_Zone28
Replies: 2
Views: 733
Fun idea! Was that Christmas tree lights in the background?
Forum: Monthly Photo Contests 04-24-2013, 11:00 AM  
Christmas Tree Light Bokeh Attempt
Posted By BB_Zone28
Replies: 1
Views: 543
Looks like a fun idea. How large was the heart pattern compared to the filter diameter?
Forum: Monthly Photo Contests 04-06-2013, 12:41 PM  
Rainy Day Feeling via Cyanotype
Posted By BB_Zone28
Replies: 0
Views: 646
Wanted to capture a rainy day feeling using black and white.
One variation of the B&W aesthetic is to add toning fx. For this image, Cyanotype seemed fitting to add to that "Rainy Day Feeling" of an overcast sky and cars driving along on the wet pavement. Also added very subtle hand coloring to some of the lights.
Forum: Photographic Industry and Professionals 01-30-2013, 02:24 PM  
Noise Reduction Software Giveaway: Let us help you improve your photos! (ended)
Posted By BB_Zone28
Replies: 382
Views: 35,574
I would like to enter this giveaway.

Entered a S/N for SMC Pentax-DA 17-70mm F4 AL [IF] SDM
SMC Pentax-DA 17-70mm F4 AL [IF] SDM Serial Numbers - Pentax Serial Number Database - PentaxForums.com

Thanks!
Forum: Pentax News and Rumors 11-09-2012, 11:01 AM  
An end to SDM failure?
Posted By BB_Zone28
Replies: 182
Views: 30,280
My DA 17-70mm failed after about 1.5 years. :( I've been using via manual focus for 1.5 years. After reading about admissions of a faulty design, I inquired of Pentax about getting it repaired. No mention of faulty design of SDM or any special discounts or replacment. They said send it in and they'll give me a quote on expenses to fix it. So, based on what I've seen, it will probably cost me $200 or more... which I'd rather spend on a reliable lens that won't fail. :( Very frustrating when they know it had problems and has been proven out to be true by the landslide of failed SDM motors.:(

I also have a DA* 50-135mm which I've used sparingly because I'm afraid the SDM motor will fail if I use it more often... this just isn't right... I should be able to use my gear worry free. PENTAX SHOULD, so to speak, JUST BITE THE BULLET AND MAKE THIS WHOLE PROBLEM RIGHT!!!:fedup:
Forum: Flashes, Lighting, and Studio 10-17-2012, 08:10 AM  
vivitar 5600 use with K-7?
Posted By BB_Zone28
Replies: 3
Views: 2,315
This sounds like the auto-flash "sensor" may be possibly dirty. Dust will reduce the light the sensor receives making it think it still needs more light and thereby cause overexposure. If it laid around face up, over time dust can settle in the tiny sensor hole in the lower middle of the front of the flash. Try blowing the dust out (can of air, but be careful not to tilt the can and just use quick, light bursts... make a test shot on a plain surface to verify if your brand of can doesn't leave residue, otherwise you'll just create more problems.)
Then retest the flash. Hopefully it won't need much if any compensating after cleaning.
Forum: Weekly Photo Challenges 08-25-2012, 01:59 PM  
Caption Contest Caption Contest 25th to 31st August
Posted By BB_Zone28
Replies: 32
Views: 3,890
Her: He's so insensitive... I told him not to smoke those ghastly things in front of me.
Him: Geez... how did I get stuck with another "Ice Queen" wanna be?
Forum: Weekly Photo Challenges 08-25-2012, 01:37 PM  
Caption Contest Caption Contest 25th to 31st August
Posted By BB_Zone28
Replies: 32
Views: 3,890
Her: yikes!! more paparazzi... my old lady disguise didn't work!
Him: What the... that lens will be my ash tray if he doesn't back off and leave her alone!
Forum: Pentax News and Rumors 06-21-2011, 04:19 PM  
Photo Rumors: The first Pentax Boutique in the US is now closed
Posted By BB_Zone28
Replies: 33
Views: 8,322
I was surprised to find out after I walked into a Wolf camera about a week ago that that Canon had dropped them. Something to do with no longer being a compatible business for their products. They only had Nikon & Sony DSLRs, and very little of them.
Forum: Pentax News and Rumors 06-21-2011, 04:12 PM  
Photo Rumors: The first Pentax Boutique in the US is now closed
Posted By BB_Zone28
Replies: 33
Views: 8,322
Until their recent demise, Ultimate Electronics had carried some Pentax cameras over the last couple of years. That included K-x & K20D DSLR's.
Forum: Pentax DSLR Discussion 05-29-2011, 10:36 AM  
Pentax K-7 v Nikon D300s - review, sort of.
Posted By BB_Zone28
Replies: 37
Views: 8,915
I appreciate you're "Nikonthink" comment as I've found the Nikon way of adjusting a camera an acquired taste after much frustration and searching over and over thru the owner's manual to discover how they can come up with the most unusual ways of doing things from my perspective. Please allow me to rant about this for moment, and I do agree that Nikon does have a great AF system.
I've helped beginners with Nikons (some with D300 that were oversold to them by the camera dealer) to figure out where to find and how to adjust settings on their cameras. Compared to Canon or Pentax cameras which I've used a lot, Nikon has some really different (read: strange) ways of organizing settings and making adjustments. Some things seem redundant as in after you make a menu selection to change something, you have to again tell it that it's really what you wanted when you select it or else it proceeds to ignore what you just selected while you're initially left with the impression that what you've selected should now have been set as it would be for a Canon or Pentax.
Also, a D300 user was having problems finding how to adjust their flash settings on the camera body. That section of the owner's manual said to adjust 'so and so' but we couldn't find how to bring up the menu and we searched thru everything in that section ...apparently the manual assumes you already know things they're not telling you. We even had an aftermarket book with us on the D300 that was 200 to 300 pages and it didn't tell us anything different either. Finally after wasting significant amounts of time we find that there's a button on the body you have to press to activate the menu...why couldn't they have said that in the owner manual instead of assuming you already know that????? Very poorly written, but I guess it adds to the mystique of making Nikons an acquired taste.
I can grab a Pentax or Canon and usually very quickly get things set up for what I want to shoot, but if I grab a Nikon I have to fiddle away critical minutes trying to figure out what the mindset is for how to find and set things.
Thanks for listening to my rant based on personal experience.
Forum: Pentax DSLR Discussion 05-29-2011, 10:11 AM  
Pentax K-7 v Nikon D300s - review, sort of.
Posted By BB_Zone28
Replies: 37
Views: 8,915
Canikon-itus has so infected the photography culture that people are constatnly amazed that any other camera besides Canikon can actually create a great image. :p
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