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Forum: Pentax K-30 & K-50 01-11-2020, 11:52 AM  
K-50 / K-500 Aperture Solenoid fix (DIY with pics)
Posted By nocturnal
Replies: 373
Views: 64,072
Photogem, for those cameras that use a solenoid in the flash requiring batteries and power...

You can slide in a thin piece of plastic under the flash to operate the lever and pop up the flash. I had to do this as my donor *ist DL2 didn't power on and I had no batteries anyhow to put in it. You need to pop up the flash in order to take the camera apart to retrieve the white solenoids for transplanting.
This method is also safer as you can leave out the batteries to allow the capacitor to slowly discharge before you open the camera.
Forum: Pentax K-30 & K-50 01-09-2020, 03:39 PM  
K-50 / K-500 Aperture Solenoid fix (DIY with pics)
Posted By nocturnal
Replies: 373
Views: 64,072
I think you are asking me? Well yes it is from the flash. On the *ist DL2 the camera needed to be powered on to pop up the flash, it seems like a bit of over design but hey I have it for a spare in my electronics box :)

---------- Post added 09-01-20 at 22:42 ----------



Sorry to hear this happened mate, such a tiny component when you see it also. :(
Forum: Mini-Challenges, Games, and Photo Stories 01-08-2020, 03:49 PM  
Thematic Lighthouses
Posted By nocturnal
Replies: 198
Views: 9,774
Interesting and usual composition Ralph but I like it :)
Forum: Pentax News and Rumors 01-08-2020, 03:46 PM  
K-new will be released THIS year
Posted By nocturnal
Replies: 227
Views: 12,118
Although I love metric and liked teaching measurement, Base 12 'dozenal' has the advantage of being divisible by more whole integers to return whole integers than Base 10.

I had a book containing the history of this stuff when doing my teaching diploma.

I'm past being interested but there are dozenal promotion societies if you want to read more. ��
Forum: Pentax News and Rumors 01-08-2020, 05:24 AM  
K-new will be released THIS year
Posted By nocturnal
Replies: 227
Views: 12,118
Survival rates are exactly the same at -40F and -40C

Even at absolute zero 0 Kelvin all atoms have an energy level
Forum: Mini-Challenges, Games, and Photo Stories 01-06-2020, 11:24 PM  
Thematic Lighthouses
Posted By nocturnal
Replies: 198
Views: 9,774
I am around 7 miles away from the lighthouse using the DA*60-250 @ 250mm so this image is very heavily cropped.

More information here
Forum: Pentax Forums Giveaways 12-29-2019, 09:27 AM  
PentaxForums 100 Year Giveaway - December/January - General Raffle Entry Thread
Posted By nocturnal
Replies: 385
Views: 9,021
Happy new year, my K-30 got a white solenoid transplant today and is currently looking forward to the rest of it's life.

Apparently a near death experience can bring such emotion :)
Forum: Pentax K-30 & K-50 12-29-2019, 09:23 AM  
K-50 / K-500 Aperture Solenoid fix (DIY with pics)
Posted By nocturnal
Replies: 373
Views: 64,072
Fixed my K-30 today with a white solenoid from a *ist DL2 donor camera. I spent as much time getting the two white solenoids out of the donor and felt the need to put it back together for some reason?

I counted 27 screws excluding solenoid screw.

It is so easy to unsolder and solder the wires whilst the solenoids are attached to the camera, don't bother soldering wires then heat shrink etc. there is no need.

I used hot melt glue on the reattached white solenoid screw as insurance and on the pink/purple wires to hold them neatly in the original position where sticky tape held the wires.

Weird the green one failed, it seems to have the same pulling apart force as the white solenoid. There was no rust on the plunger, it looked in great condition and the solenoid was parallel also.

There is loads of play in the white solenoid also but the white PTFE definitely has less friction when you pull out the plunger at an angle.

Now I have a spare white solenoid should my K-70 ever go bad, you get 2 of them in *ist DL2 :)

The resistance of the white solenoid read 29.8 ohms and I read 28.6 ohms from the failed green unit I removed.
Forum: Pentax K-30 & K-50 12-24-2019, 09:38 PM  
K-50 / K-500 Aperture Solenoid fix (DIY with pics)
Posted By nocturnal
Replies: 373
Views: 64,072
Well done! I need to do mine within a week so my mother can take a K-30 on an exotic holiday with her, just using a 18-55 kit lens on auto settings. I even got a Sandisk Extreme Pro 128GB card for her so she can use RAW and I can edit the images.

The blobs of blu tack are a good idea, mixing up screws is a no no and simple methodical methods like this eliminate the danger.
Forum: Lens Clubs 12-23-2019, 08:25 PM  
DA Limited Zoom Club
Posted By nocturnal
Replies: 787
Views: 170,718
Very artistic one edri, how did you achieve this?

I like how you made a photo from the usual bland telecoms tower, I have photographed these myself but they do need to be electrified somewhat. ��
Forum: Lens Clubs 12-11-2019, 09:06 AM  
The 15mm Limited controls my mind - club
Posted By nocturnal
Replies: 11,454
Views: 1,937,584
Only photographers have defects :lol:

I lusted after this lens for years when I couldn't afford it..

I should have gone into debt to get it earlier :p

---------- Post added 11-12-19 at 16:13 ----------



Good attempt and nice composition/location but 1sec is beyond IBIS, using f8 here would have allowed 1/4sec and very possibly a non-wobbly photo depending on your wobbliness :lol:

I've did 4sec "handheld" but rested on a gatepost and got a sharp nightscape with Samyang 14mm @ f2.8

A monopod is even good with the camera forced against a tree :)
Forum: Lens Clubs 12-07-2019, 02:59 PM  
SMC Pentax-DA* 50-135mm F2.8 SDM Club - Show your love for the "stack of primes"
Posted By nocturnal
Replies: 41
Views: 1,310
Interesting to hear of the return to the DA* 50-135 from DFA 70-200 but no surprise given the bulk and weight of the latter.

The DA* 50-135 f2.8 has become very cheap on the used market. A fully working copy (SDM still works) got no bids at 199 on Ebay last week... 199 for this lens is insane and I would buy one except for buying the DA* 60-250 f4 this year.
Forum: Lens Clubs 12-06-2019, 06:56 AM  
Starbursts Lens Club
Posted By nocturnal
Replies: 64
Views: 2,805
The fabulous HD DA 20-40 f2.8-f4 Limited in a forest on the suburbs of Belfast City, Ireland, on a frosty morning the sun is rising.
Forum: Lens Clubs 12-06-2019, 05:13 AM  
The 15mm Limited controls my mind - club
Posted By nocturnal
Replies: 11,454
Views: 1,937,584
I already had the Samyang 14mm f2.8 and whilst sharper over the whole frame, faster and sharp at f2.8 it had significantly more 'significant' weaknesses than the DA15. Lens flare, distortion, colours, rendering, sun burst shape, size, weight, close up ability and every other lens quality were significantly worse.

DA15 has pixie dust and buckets of it, I bought it for a photography holiday down the west coast of Ireland which is photography paradise and managed to nail some of my best ever work and haven't left the house without it since.

I only use the Samyang for astrophotography which it is great for and the weaknesses don't really matter.

Shows the reason why you may need 2 prime UWA lenses, one for day and one for night with different specialisms.

You could have a DFA 15-30 that does both but then a massive weakness shows up, that being the huge beast it is.

A Canon shooter thought I was using a compact camera up the mountains when it was K-30 & DA15, he couldn't believe it was a DSLR and UWA. :lol:
Forum: Lens Clubs 12-06-2019, 02:19 AM  
The 15mm Limited controls my mind - club
Posted By nocturnal
Replies: 11,454
Views: 1,937,584
What like? You seem to use it a lot and post a lot of photos here with it. I can't see any serious disadvantages in the photos you have been posting and I often press the LIKE button. :)

---------- Post added 12-06-19 at 09:31 AM ----------



Rayallen has learnt the best way to use it and where to focus it. You can find discussions exactly like this one online going way back to when the DA15 came out.

For anything other than close ups (where I want OOF and bokeh besides thd main subject) I use manual focus and magnified focus peaking in Liveview checking focus in all areas like any landscape photographer would do.

Talking of close ups, most people don't know or use the DA15 for this but it is brilliant for this! It has short minimum focus distance and the HD version has nice bokeh too.
Forum: Lens Clubs 12-05-2019, 01:12 PM  
The 15mm Limited controls my mind - club
Posted By nocturnal
Replies: 11,454
Views: 1,937,584
Just one of the film settings for Game of Thrones, and because of this damn TV programme it is getting too many tourists... 20 tripods queueing up in one place and I'm the only local. :(

It is dark under the tree canopy, hence why they used this location. 0.8sec at f11 during daytime but may have had a polariser on!
Forum: Lens Clubs 12-05-2019, 12:57 PM  
The 15mm Limited controls my mind - club
Posted By nocturnal
Replies: 11,454
Views: 1,937,584
The DA15 on FF has hard vignetting all around the frame so a 1:1 just removing both sides with full FF does not work. Therefore to get 1:1 you need to remove the top and bottom bits too, it doesn't expand much more than native APSC at the sides, more play in the height.

Thd DA15 only has weak corners open wide or if you haven't learned how to focus it properly. Other mistakes are blaming the lens for not having enough depth of field which is easy done with UWA. It does have field curvature, again you need to know this and forget about brick wall photographs.

It is my mistake if I get weak corners using DA15, not the lens so don't blame your equipment. :-)
Forum: Lens Clubs 11-25-2019, 05:06 PM  
DA* Club
Posted By nocturnal
Replies: 5,313
Views: 777,895
Amazing photo and little bird!

You did the right thing... Get the shot and don't worry about the ISO, the latest Pentax bodies have amazing ISO performance anyhow.

The K-70, KP and K1-ii have an accelerator chip installed with the sensor to boost ISO performance and it works fabulously. :)

The IQ from that 50-135 is great.
Forum: Lens Clubs 11-24-2019, 09:17 PM  
The 15mm Limited controls my mind - club
Posted By nocturnal
Replies: 11,454
Views: 1,937,584
That isn't flare but sunlit dust spots somewhere in the, on the lens or on a filter if you had one attached coming into focus due to the increased depth of field. Usually I see this with an attached grad filter and high f number but you can use it for creative effects, it looks like photons arriving from the Sun :)
Forum: Post Your Photos! 11-22-2019, 07:28 PM  
Landscape Orion over Dawson Falls
Posted By nocturnal
Replies: 21
Views: 441
Nicely done aitrus3, however you say 3x 15min exposures for the foreground, I can't understand how then there are no star trails in the reflection off the river. 45 mins should leave a longish set of trails. I'm seeing a reflection matching the tracked stars.
Forum: Pentax Forums Giveaways 11-19-2019, 10:59 AM  
PentaxForums 100 Year Giveaway - November - General Raffle Entry Thread
Posted By nocturnal
Replies: 400
Views: 8,713
That Theta SC looks like a white HAL 9000 computer. More interesting than Alexa ��
Forum: Lens Clubs 11-12-2019, 05:00 PM  
The 15mm Limited controls my mind - club
Posted By nocturnal
Replies: 11,454
Views: 1,937,584
The fabulous and unspoilt beaches of the west coast of Ireland.
Forum: Pentax K-30 & K-50 11-11-2019, 12:29 PM  
K-50 / K-500 Aperture Solenoid fix (DIY with pics)
Posted By nocturnal
Replies: 373
Views: 64,072
So called professional reports don't mean a damn thing, trusting these shows gullibility due to having no electronics experience. Blaming a resistor shows a complete lack of electronics knowledge and especially if it isn't even there. :lol:

How many so called professionals in many fields tell lies or don't really know or best guess what a problem is caused by?

How professional is it to put a crappy green solenoid back in? Where are these service centres getting their green solenoids from? Who says they are professional? Yes they make a living from it but it doesn't mean they are good at it.
Forum: Lens Clubs 11-11-2019, 07:22 AM  
The 15mm Limited controls my mind - club
Posted By nocturnal
Replies: 11,454
Views: 1,937,584
Interesting and looks better with more pixels than crop mode. I like using the DA15 for 1:1 on APS-C.

DA15 a little bit smaller and lighter than DFA 15-30 eh? 😁
Forum: Pentax K-30 & K-50 11-11-2019, 03:22 AM  
K-50 / K-500 Aperture Solenoid fix (DIY with pics)
Posted By nocturnal
Replies: 373
Views: 64,072
Resistors are generally the toughest electronic components and definitely won't fry in this case. Even large capacitors popping rarely blows resistors despite the varnish on them looking burnt etc.

As to the poster claiming white solenoids aren't available, not new but as explained you can salvage them from certain types of Pentax bodies. I have a broken *ist LD2 coming to me shortly with 2 of them inside assuming the seller hasn't removed them.

I got the solenoid on my K-30 working again for a short while by exercising the plunger a few times, initially it freed it up and it worked fine again for a short time but it didn't feel smooth. This is down to the space (wear) between the plunger and PET housing, not the electronics here and obviously the resistor was fine too even though apparently it's not even part of the aperture circuit 😁
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