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Forum: Pentax Medium Format 10-05-2021, 10:43 AM  
Pentax 645 longevity
Posted By Alex645
Replies: 6
Views: 440
I have owned and used my Pentax 645 since 1986 and acquired a 645N around 2010. It was my personal camera for daily work in Los Angeles for five years, then on travels to Mexico, Egypt, and France. I then moved to Switzerland, back to California, and have now been in Hawaii since 1996.

It has seen hot dusty deserts, freezing cold alps, and now humid and wet tropics. The electronics has not skipped a beat. However, it is NOT weather sealed and the most problematic reliability issue is the power supply. Mine will usually stall when going through sudden temperature and humidity changes.

Indoors it's fine. Outdoors it's fine. Sudden and extreme transitions and I'm temporarily disabled anywhere from an hour to half a day.

The two things that I know of that can fail are the battery holder (broken plastic or corroded contacts) and I've known other 645 owners that had a bad film advance gear.

As a photo teacher that sees over 200 SLR cameras each year, I have seen certain makes and models that consistently have bad electronics; the 645 is NOT one of them.
Forum: Pentax K-3 III 08-01-2021, 11:29 AM  
First Impression
Posted By MJ43
Replies: 14
Views: 3,012
Simply wow.
I mainly shoot motorsport and up to now none of my Pentax could match my daughter's Canon 7D MK2 with 100-400 USM or 300 F2.8 combo. All changed today - first time out with the K3MkIII - simply blown away with how well the auto focus works with the PLM 55-300.
Only missed a couple of shots and that was because the camera froze - went blank (battery in and out job - fully charged standard battery). I have seen this reported elsewhere and expect a firmware upgrade will fix it at some time so for now no worries.
Early days but I think the auto focus is a match for, or better than, the Canon. The camera is impressive just need a lens to match the Canon one's - but at a sensible price...
Forum: Pentax Medium Format 01-28-2020, 02:45 PM  
Pentax 67 400 4.0 ED IF - use with full format 35mm DSLR
Posted By optikus
Replies: 19
Views: 3,065
Good evening,

more than one year passed by until I found what I looked for - a solution fr a rigid mounting of the lens. Have a look to the fount solution using a ASI astronomy camera mounting ring. It works properly with an arca adapter on the tripods ball head. The Ring uses the P67-EOS-adapter on a diameter of 86mm. The ring bought at teleskop express webshop was manually manipulated to handle the release-knob of the P67 mount and the foam insinde was removed. The shade was a smaller one from Heliopan, inside covered with ultra black color by airbrush. Stray light sensitivity is reduced as I expected and the mech. dimensions are better to handle. The lens is large enough. Works with GFX50R via adapter as well. The camera attached here is "M" from Canon. All Adapters from K&F Concept or similar work as well, K-Mount, 645, GFX, EOS...

Forum: Pentax Medium Format 01-13-2018, 11:38 PM  
Pentax 67 400 4.0 ED IF - use with full format 35mm DSLR
Posted By optikus
Replies: 19
Views: 3,065
Hello Desertscape,

what you wrote is also the essence of what I found in the web, the EDIF will perform wide open, I compare the "*"-Lenses of Pentax with the Canon's "L"-series, The Pentax lenses seem to be interesting for manual use on my EOS because of the easy adaption, good price and modern designs, in Germany we often look on our own vintage lens brands, but the prices for the commonly as good seen lenses are far from realism.

The 400 4.0 EDIF seems to have a very precise flat image-plane also, there exist CCD-Images with sensors much larger than 35mm with absolute fine stars to the edges and without any blur and fringing, so the invest in such a lens will have much potential for the future.

So far as seen in the www all of the EDIF's perform very well, so the 400 4.0 will be the first, bus perhaps not the last, we will see. This moment I observe some on EBay, the prices for a komplete package as deliveres are around 1.000 € + shipping, I try to keep patient and wait for the best offer. Fast buying is expensive buying on EBay.
Until having purchased a copy of the lens I optimize my german mount and autoguiding, enough to do. Some shorter lenses are here and also a EOS 20Da for testing, so the time will not become to long.

Kind regards
Forum: Pentax Medium Format 01-11-2018, 01:09 PM  
Pentax 67 400 4.0 ED IF - use with full format 35mm DSLR
Posted By optikus
Replies: 19
Views: 3,065
Good evening from Germany,

thank you to the community for the received information, akquisition of a copy is started, now I will see what is on the market here. Next job is the mounting of the lens on a telescope mount. Some ideas come from the links the forum delivered, others come from some publications of VdS in Germany. I will report what happens and how it looks like.

Kind regards
Forum: Pentax Medium Format 06-30-2021, 05:57 PM  
Pic included in Royal Observatory / BBC astro photography awards
Posted By Ed Hurst
Replies: 36
Views: 1,837
Hello all,

I hope this is allowed and also that it isn't too obnoxious of me to post it. But I want to share the joy with my fellow Pentax friends...

I have been lucky enough to be shortlisted in the Royal Observatory Greenwich 'Astronomy Photographer of the Year 2021' (run in conjunction with the BBC's Sky at Night Magazine and the National Maritime Museum in London).

You can see some of the shortlisted images here... Mine was taken with the 645Z and 25mm DA lens. My breath is taken away by some of the images I am up against, but it's still nice to be shortlisted.

Astronomy Photographer of the Year 2021: Shortlist revealed - BBC News

All the best,
Forum: Pentax Medium Format 05-08-2021, 08:42 AM  
Pentax 645 Battery Holder
Posted By angerdan
Replies: 8
Views: 778
Great work!

I'd include it in this list:
More Pentax related 3D printable goodies -
Forum: Pentax Medium Format 05-06-2021, 05:04 PM  
Pentax 645 Battery Holder
Posted By eccs19
Replies: 8
Views: 778
Quick update. I got a 3D printed prototype made. It wasn’t printed at the correct resolution, but was still good enough to test fit in my camera. Wasn’t perfect, but I could get it to lock. Took a bit of pressure to get it locked, but it did work. It seems it’s a little wide on the outside where it’s supposed to mount flush with the camera. Not sure if it’s because the print was a bit “off” of if my model is a bit off. I’m going to try printing another version and see how that works.
Forum: Pentax Medium Format 04-24-2021, 10:46 AM  
Pentax 645 Battery Holder
Posted By eccs19
Replies: 8
Views: 778
I read a thread in here and someone mentioned they were coming up with a replacement battery holder for the 645. Someone also posted in the 645 Facebook group that they were doing the same thing. Might be it's the same person, but I can't be sure. He has posted a start on a STL file he was working on, and I had a look at it. The roots of the project were definately there, but it had a ways to go. Until that point, I never realized there was much demand for this item, but it appears there is. Regardless, I figured this might be something I can work on to help out the comminity. Seeing as I basically do this sort of reverse engineering for a living, I figured I'd give a go at modeling this. So what I've come up with I think is a very good start. I've got my friend 3d printing a prototype so I can see if it will actually physically fit in the camera as it's supposed to, and I'll go from there. I've attached a few pictures to show my progress. Feel free to give me any input on what might be a good thing to change. This is basically modelled like the existing on, and the person who was working on it, mentioned he was doing this up to work with a 9V battery, so that is definately something I can look into as well if the interest is actually there. Only thing I've not modelled in is the texturue on the grip. I probably won't be able to easily duplicate the pattern, but I can definately come up with something.

As you can see from my overlay of my 3D scan vs the CAD I created, it's not perfect, but seeing as the original is like a million years old (lol), I took some educated guesses. I'll know for sure if it's a problem when I do my test fit of the 3D printed prototype.
Forum: Pentax Medium Format 05-04-2021, 09:51 AM  
Why can't we crowdfund a 645 ultrawide?
Posted By barondla
Replies: 62
Views: 3,121
What a cool crowdfunding project! Didn't know this existed. Proves it can be done.
Thanks for sharing,
Forum: Pentax Medium Format 05-04-2021, 09:27 PM  
Bronica PG lens on Pentax 645Z - images.
Posted By barondla
Replies: 14
Views: 934
Fotodiox had a sale on their Bronica lens adapter. So I picked one up and found a PG lens on the bay,

The adapter is well made and the inner surfaces aren't as reflective as previous adapters. It fits both camera and lens well. I did add flocking inside to make it even less reflective.

The Bronica PG lenses were made for the last Bronica SLR - the 6x7 GS-1. The lenses have leaf shutters that do not function with the Pentax 645. The 150 lens is the smallest of all PG lenses. Many Bronica users praise the bokeh.

Using the Pentax 645 with the Bronica isn't difficult. It does require stop down metering. There is one small hitch. The adapter has no way to stop the lens down. It is always wide open. The lens has a button for depth of field preview. It doesn't lock. I use a wire zip tie to keep the button depressed.

I think the lens performs nicely. It has nice bokeh and F4 gives a little more depth of field than the Pentax 165 F 2.8.
Here are a few pictures processed in my normal fashion.

Thanks for looking,

Tree full of blooms was shot at F4. Tree trunk at F8. Both on tripod.
Forum: Pentax Medium Format 02-06-2021, 04:06 PM  
645 battery holder
Posted By Boltonius
Replies: 37
Views: 6,429
I'm pleased to say I completed my AA battery holder hack. It's got looks that only a mother could love.. but it works perfectly and the camera is now a joy to use.

The holder had the 9v output terminals on its side, so I had to rewire it for the output terminals to be on the end and in the proper polarity. Solder, cutting springs, cussing..
Forum: Pentax Medium Format 03-30-2021, 07:29 AM  
Post your medium format photos!
Posted By Eric Auer
Replies: 17,454
Views: 2,823,605
Pentax 645N | SMC Pentax-FA 645 45-85mm 4.5 | Fomapan 100 | RO9 1:25 | CS F96

Untitled R-9
by Eric Auer, on Flickr
Forum: General Talk 01-07-2021, 07:26 PM  
Your vehicle: what do you have, why do you like it, and what do you not like?
Posted By Racer X 69
Replies: 2,523
Views: 176,227
I even went off road in a semi tractor.

Stuck in Arizona for a weekend oversize load curfew I decided to go sight seeing. The truck stop I stayed at was East of Texas Summit, the TA in Wilcox, so I left the trailer and load, drove up to Texas Summit, and turned off and drove 5 miles or so up a dirt pig path in the desert. I drove until the dirt track degraded to the point I felt it wasn't suitable for a 30,000lb highway truck, parked and went for a hike, enjoyed the desert, made a few exposures, then headed back.

Texas Summit by Racer, on Flickr
Forum: General Talk 01-10-2021, 08:51 AM  
Your vehicle: what do you have, why do you like it, and what do you not like?
Posted By timb64
Replies: 2,523
Views: 176,227
I drive this beast around the narrow country lanes of Suffolk for work.Most people give me right of way!

Forum: General Talk 01-30-2021, 02:49 PM  
Your vehicle: what do you have, why do you like it, and what do you not like?
Posted By dipo 1
Replies: 2,523
Views: 176,227
Found this pic, enjoy
Forum: General Talk 07-09-2015, 03:45 AM  
Your vehicle: what do you have, why do you like it, and what do you not like?
Posted By hoopsontoast
Replies: 2,523
Views: 176,227
My daily, a 1993 Toyota Celica ST182.

Its a standard 2.0L Twin Cam ST182 (UK/euro model) but with the ST185 Bonnet and aftermarket alloys both fitted by the previous owner. I believe it also has the Japanese/import spec front bumper and fog lights.

Celica B&W by Robert Seymour, on Flickr

What I like:
- Quite practical for a 2-door coupe, big boot and fold down rear seats.
- Good mix of speed/overtaking ability and MPG (UK) ~32mpg average and more recently around 35mpg
- Reliable (so far) - all the electrics still work and feels good considering its ~20yrs old and 100k miles+
- Great value
- Excellent PAS, great feel and relatively heavy compared to modern cars.
- Nice size, feels smaller than it looks, when driving.
- You can fit two adults in the back, just.
- Pop up Headlights
- Sounds great at full pelt, even with stock exhaust.
- Happily does my ~40mile round commute every day sitting in traffic, open roads etc
- Cloth seats with very good back/bolster support and nice driver focused interior layout

What I don't like
- Not much at all.
- Could be more comfortable over rough roads but its still pretty good for a sporty car, especially for its age.
- Torque Steer, ~160bph in a front wheel car from the '90s is never going to be that great, only really noticeable in low gears and accelerating hard.
- Could have a bit more torque, being a N/A twin-cam all the power is up the top end.
- Gets very hot inside the cabin in the sun, like a greenhouse and right now the air-con is not working.

Previous car history was a mix of classic Triumphs (Dolomite Sprint, 1850HL, TR7 and Acclaim) then a Rover 100 (Metro) so the Celica feels light years ahead!
Forum: General Talk 07-08-2015, 09:48 PM  
Your vehicle: what do you have, why do you like it, and what do you not like?
Posted By SpecialK
Replies: 2,523
Views: 176,227
2002 Celica, 208K miles. Runs well, 32 MPG. Front hubs make a clicking sound (for years) that I have learned to live with. New tires, brakes, coil and plugs this year. A bit of bondo thanks to people running into it. Once got stuck in sand...

On a good day at Trona Pinnacles in '08.

Not looking forward to replacing it, though its time will come. Actually, I probably would like something newer but don't want a car payment :-) This is from the CD/cassette era. The 3.5mm input was still a year or two away - though I have a cheap cassette adaptor for my Sansa MP3s.
Only con I can thing of is rear corner view is obstructed making backing out of a parking space an adventure.
Forum: Pentax Medium Format 03-28-2021, 07:52 PM  
Post your medium format photos!
Posted By Eric Auer
Replies: 17,454
Views: 2,823,605
Pentax 645N | SMC Pentax-FA 645 45-85mm 4.5 | Kodak Tri-X 400 @1600 ISO | Kodak D76 Stock | CS F96

By The Window
by Eric Auer, on Flickr
Forum: Pentax Medium Format 10-19-2011, 02:21 PM  
Blinking "0" on 645N
Posted By JayH
Replies: 8
Views: 2,685
figured it out....switch was flipped for a double exposure so would not advance the film....
Forum: Sold Items 02-27-2021, 07:45 PM  
For Sale - Sold: Macro Stand using a Soligor Macro Photographic Stand (PRICE REDUCED)
Posted By Reality_Check
Replies: 5
Views: 1,330
What a cool stand. I've thought long and hard about making something like this to begin to quickly and easily digitize old film photos. Free bump from me just for the cool factor. Good luck with the sale!
Forum: Pentax Medium Format 02-24-2021, 07:03 PM  
Behind the Scenes of "Post your medium format photos!"
Posted By TDvN57
Replies: 77
Views: 5,251
With too much time on my hands these covid days and motivated by curiosity I hooked up a series of teleconverters to the P67 400mm f4 lens mounted on the 645z. The rig is difficult to handle and definitely needs a sturdy and heavy-duty tripod and head.

Live-view of the island it is aimed at. The exposure readings are totally off, because the camera is reading the aperture at f/8, but in reality is around f/16. Thus getting the correct exposure takes a few test shots.

The red square is about the frame I had with the 645z and all the teleconverters.

Picture with 645z uncropped. According to google maps this is +/- 4.1km (2.5 miles) away. If you zoom in you will see a man standing on the upper deck just behind the wheelhouse.

Picture of the moon taken a few days ago with the same setup, about 80% crop:

In my opinion this combo of teleconverters has very limited practical use, such as moon shots perhaps. For landscape it does not perform that well for obvious reasons. I did not test for any differences in IQ if the sequence of the P67 TC's were swapped or not. My reasoning was that the TC1.4 will most likely enhance the image sharpness whereas the TC2.0 will not, so it made sense to me to first use the 1.4, then the 2.0 etc.

---------- Post added 2021-02-25 at 10:37 AM ----------

Mike your pictures are exceptional. Good eye for spotting the scene in the distance.
Forum: Pentax Medium Format 02-25-2021, 11:04 PM  
Behind the Scenes of "Post your medium format photos!"
Posted By Ed Hurst
Replies: 77
Views: 5,251
I just posted this on the main thread:
[IMG]Star Trails over Dee Why lagoon by Ed Hurst, on Flickr[/IMG]

Here are some 'behind the scenes' pictures showing the ridiculous height required to get the picture. The cops pulled over at around 2.30am to enquire what I was up to - but were friendly and curious.
[IMG]signal-2021-02-26-165844_001 by Ed Hurst, on Flickr[/IMG]
[IMG]signal-2021-02-26-165844_002 by Ed Hurst, on Flickr[/IMG]
Forum: Pentax Medium Format 01-23-2018, 08:17 PM  
Original 645 Rare Option? Half Stop Exposure Compensation
Posted By nathanduncanphoto
Replies: 5
Views: 1,157
So I have a "common" P645 and I just ordered an additional one as a back-up from a shop in Japan via eBay. (I ordered my other one in the same manner) Anyway, the one that I've been using is likely common to yours as the dial wheel on the left rear is for SINGLE or CONTINUOUS shooting. The new one is like the old one as they are both original generation models, but the new one has a different dial wheel. Instead of C/S, it's a half stop exposure adjustment. ALSO the guard wall surrounding the ON/OFF switch on the handle is beveled like a ramp instead of simply raised above the ON/OFF switch. Anyone ever see this version before? Or have info on it? The serial number on this one I just bought is a little older than my other one (which I estimate to be an early 90s production era). You can see these two serial numbers that I've entered in the serial numbers section of this webpage. Questions, comments, or answers welcomed. Thanks!
Forum: Pentax Medium Format 02-23-2021, 10:24 AM  
Behind the Scenes of "Post your medium format photos!"
Posted By mikeSF
Replies: 77
Views: 5,251
Night Passage

and catching a few Z's between stacked exposures...

---------- Post added 02-23-21 at 10:03 AM ----------

Walking The Dog

...and standing in the middle of California Street in morning traffic....

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