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Forum: Pentax Medium Format 07-30-2012, 01:15 PM  
Paper Pentax 67!
Posted By kkado
Replies: 35
Views: 8,276
Technically it's not origami since it's not one square piece of paper, but I'll accept that compliment anyways :lol:

The materials really aren't all that special. The black paper is just regular thin black construction paper, and the white paper is thin card stock. And the shiny stuff is just some aluminum stock (1/64" IIRC) I picked up from a local hardware store. The rest of the instructions will be finished up later this week. Until then, happy folding!
Forum: Pentax Medium Format 07-28-2012, 10:53 PM  
Paper Pentax 67!
Posted By kkado
Replies: 35
Views: 8,276
10. Glue the prism to the body. The easiest way is to first glue the forward tab to the body.



11. Then glue the rest of the tabs. There will undoubtedly be a few "pinhole" light leaks at the glue joints. Seal these up with little pieces of black paper.



12. Cut out the Lens Nameplate from Page 1, and the Lens Outer and Lens Inner from page 2.



13. Glue the Lens Inner to the Lens Nameplate.




14. Glue the Lens Outer into a tube (use the Lens Inner as a form, so that they fit snugly into one another). Then glue the assembly from Step 13 into the Lens outer. Let about 4-5mm protrude from Lens Outer, as shown.




15. Glue this assembly to the Body. Cut out the Aperture Ring and Focus Ring from Page 2. Then glue these to the Lens.



That's all for now! I'll finish up the instructions later tonight, or maybe tomorrow. Starting to look like a camera, right? :D
Forum: Pentax Medium Format 07-28-2012, 10:44 PM  
Paper Pentax 67!
Posted By kkado
Replies: 35
Views: 8,276
6. Cut out Shutter from Page 3. You can use it as-is, or cut it out of some thin aluminum stock as I have. There's a lot less friction, and it won't get all bent-up in operation.




7. Cut out Shutter Cover from Page 3. Simply glue it over the shutter. Be sure not to glue it to the shutter itself! (That would be a disaster! :fedup:) Apply glue conservatively, and clamp it by resting something on top of it.



8. Make a pinhole in some aluminum foil or pie tin. I think 0.3mm is a good diameter. There are plenty of good tutorials out there for making a pinhole. Glue it to the shutter cover piece.



9. Make a small hole in a scrap piece of black paper, and glue that over the pinhole material. This will help reduce internal reflections.

Forum: Pentax Medium Format 07-28-2012, 10:36 PM  
Paper Pentax 67!
Posted By kkado
Replies: 35
Views: 8,276
Let's get started with some instructions! Plenty of pictures incoming, so I hope the mods don't get too mad at me :lol:

Here are some things you'll need:
~ 100-150GSM paper
~ 40-70GSM black paper
~ Sharp knife (#11 xacto blade suggested)
~ Metal ruler
~ Paper glue (Elmer's is OK, but something more permanent is recommended. I used Scotch Clear Glue from OfficeMax.
~ Glue stick or spray glue (3M 77, or Elmers Spray Adhesive)
~ 1/4" - 20 nut (If you plan to have a tripod attachment)
~ Some corrugated cardboad, or mat board
~ Patience, patience, patience!

Disclaimer: Not everything on these printouts is exact - you'll probably have to do some trimming here and there.

Top Gear Top Tip: Wash your hands often! Ink and glue will rub off onto your fingers and leave ugly gray marks on the paper.

1. Glue pages 1-3 to the black paper, using spray adhesive or a glues stick. On page 1, the Top Plate and the little trim pieces need not be glued to black paper. You can cut those out and put them aside.

2. Cut out the Prism Roof from page 3. Crease all of the tabs and gently bend the gray lines. The metal ruler will help to make crisp creases.



3. Then glue it together as shown here. Use conservative amount of glue, and remember that it dries the fastest when it's applied in a thin, even coating.



4. Cut out the Body from page 1. Make sure to cut out all parts marked with a red "X." The tripod hole is optional, but if you plan to use a tripod nut, cut it out now. It's tedious, but you'll be rewarded in the end if you're patient :)



5. Fold it up! Go slowly, and glue only a few tabs at a time.


Forum: Pentax Medium Format 07-27-2012, 12:23 PM  
Paper Pentax 67!
Posted By kkado
Replies: 35
Views: 8,276
Mine was about 0.3 - 0.4mm. I tried smaller on my first test roll, but I think it was softer due to diffraction.



For some reason, the hyperlink doesn't work (and I don't know how to fix it). But it works if you just type in the URL :)

And I've been planning on making instructions, but just never found the time to. I'm hoping I can get started on them this weekend!
Forum: Pentax Medium Format 07-25-2012, 04:04 AM  
Paper Pentax 67!
Posted By kkado
Replies: 35
Views: 8,276
It's not obvious :lol: The film is loaded through the bottom of the camera. The bottom cover (Page 4, and one piece on Page 1) simply comes away to give you access to the film. You wind it using the knob that would normally control shutter speed under the TTL meter, and a red window in the back gives you the right spacing. I just used some material from a red gel for the red window.



Forum: Pentax Medium Format 07-24-2012, 08:09 PM  
Paper Pentax 67!
Posted By kkado
Replies: 35
Views: 8,276
Here's the LINK to the PDF!

The current revision is "Build 3," which will change as suggestions and refinements roll in. There are currently no instructions, but I'm working on it. I'm going to start building one tonight, and I'll post photos so those interested can follow along :)
Forum: Pentax Medium Format 07-22-2012, 10:51 PM  
Paper Pentax 67!
Posted By kkado
Replies: 35
Views: 8,276
Certainly, it's just one piece that's glued onto the prism. You'd just omit it. A waist-level finder could be an option too. . .

I ran another roll through it after patching up some of the light leaks, with much better results this time :)











Still working on making that PDF :o
Forum: Pentax Medium Format 07-20-2012, 05:43 PM  
Paper Pentax 67!
Posted By kkado
Replies: 35
Views: 8,276
I'll certainly provide a link to a PDF once I finish up the templates, maybe in a few days at the earliest. I just need to add on the finishing touches and write up some instructions. Perhaps I'll post pictures as I build the final version so people can follow along.
Forum: Pentax Medium Format 07-20-2012, 01:47 PM  
Paper Pentax 67!
Posted By kkado
Replies: 35
Views: 8,276
I'm not entirely sure this belongs in this forum, but I figured people here might appreciate this :) It's a papercraft model of a Pentax 67, scaled down to 75% to take 6x6 images on 120 film. I've only been able to run one roll through it so far, but here are some of the results:









There are still a lot of light leaks to sort out, and I'd like to add textures and details like the strap lugs and shutter release. I wouldn't mind releasing a PDF later if there's enough interest!

Update: There's a PDF of templates further down on the page :)
Forum: Pentax K-5 12-20-2011, 11:06 PM  
Best screen ever for manual focus : Canon ee-S!!!
Posted By kkado
Replies: 769
Views: 169,233
I had my Eg-S screen cut out the other day by a jewelrymaker in town who had an Epilog laser cutter. I just gave her an Adobe Illustrator template and the focusing screen and it was cut out in a matter of seconds. In total the whole shebang cost me $60.

The brightness of the screen wasn't much better than the ebay split screen I had installed earlier, but good god, the DOF rendering is amazing! I think the accuracy of the focusing depends on your level of visual acuity; I find this screen easy to focus with, but my dad still swears by the old microprism spot and split prism.
Forum: Pentax K-5 12-09-2011, 01:45 AM  
Best screen ever for manual focus : Canon ee-S!!!
Posted By kkado
Replies: 769
Views: 169,233
I have an eg-s on the way (the variant of the ee-s for the 5DII), and I'm having it cut out by a local laser company for $20. So $40 from eBay with free shipping and $20 for the setup fee to have it cut. Pretty excited! :)
Forum: Pentax SLR Lens Discussion 11-29-2011, 02:20 AM  
Nikon 135mm f/2 AI adapted to PK
Posted By kkado
Replies: 5
Views: 3,143
Thanks for the kind words everyone! I hope to have more photos with the lens once my K5 comes in the mail :D
Forum: Pentax SLR Lens Discussion 11-26-2011, 03:06 AM  
Nikon 135mm f/2 AI adapted to PK
Posted By kkado
Replies: 5
Views: 3,143
During the Thanksgiving downtime, I did some surgery on my newly acquired Nikon 135mm f/2. I knew from previous threads that it was possible to directly mount old F-mount lenses to Pentax cameras, but I wanted something that locked at the 12 o'clock position and had a usable focusing scale. The conversion was quite simple and is mostly reversible. The mount was removed with a JIS cross-point screwdriver (important, since the heads are NOT Phillips, and the threads are locked in place) and replaced with an aluminum spacer and PK-M42 adapter. The spacer and mount flanges combined were about 0.95mm thick, so the lens focuses a tiny bit past infinity. Here's a comparison with a C/Y Planar 85/1.4 and a Nokton 58/1.4. In the last picture, you can just make out the aluminum spacer and brass flange. These were simply glued together with metal cyanoacrylate. All of the "machining" was done with a jeweler's saw and a Dremel tool. The AI-indexing ridges were filed down just a hair (less than a millimeter) to get the lens to sit flush with the camera-side mount.









Here are a couple of images from the lens, both at f/2. I haven't had much time to shoot with it due to the typically rainy Portland weather.





It is quite sharp wide open, but suffers from purple fringing and a "glow" under high-contrast situations (kind of what you expect with long, large aperture lenses, though). Sharpness doesn't improve much upon stopping down, but contrast and PF issues improve by f/2.8 or f/4. The defocusing characteristics are generally very creamy, except for bright point highlights. For the record, my girlfriend thinks that it's the ugliest lens she's ever seen :o

I'd like to convert more Nikon lenses by replacing the lens mounts with a spacer and a Pentax bayonet. This method is more labor intensive, but is cleaner and more secure. Maybe a 35/1.4 or a 28/3.5 shift would be next :D
Forum: Sold Items 11-12-2011, 12:42 PM  
For Sale - Sold: Pentax K5 and 40mm LTD Kit
Posted By kkado
Replies: 6
Views: 1,408
PM Sent!
Forum: Sold Items 11-11-2011, 02:13 PM  
For Sale - Sold: Zeiss Contax 85mm f/1.4 adapted to Pentax K
Posted By kkado
Replies: 3
Views: 1,675
Sold pending payment!
Forum: Sold Items 11-11-2011, 02:29 AM  
For Sale - Sold: Zeiss Contax 85mm f/1.4 adapted to Pentax K
Posted By kkado
Replies: 3
Views: 1,675
PentaxForums.com Marketplace Listing

Item for Sale
Zeiss Contax 85mm f/1.4 adapted to Pentax K

Asking Price
645 USD

Item Location
Portland, Oregon (United States)

Item Description
Up for grabs today is my Zeiss Contax 85mm f/1.4 Planar. It has been adapted from C/Y mount to Pentax K using the Leitax adapter. The Leitax adapter replaces the original C/Y mount with an M42 fitting. A genuine Pentax M42-K adapter is included with the lens. For all intents and purposes, this lens behaves just like a M42 lens (in terms of communication with the camera).

Optics are in superb condition. The lens surfaces are pristine, with only a tiny coating mark on the rear element. There are also a few extremely fine specks of dust. The aperture is in perfect shape.

The body of the lens is perfect besides a couple of pinpoint spots of missing paint, but these are too minor to show up in photographs.

The Leitax mount is attached with screws and metal cement (as some of the original screws were stripped), as pictured. The lens-mount interface is nevertheless very solid, and I have had no problems with it over the past two years of frequent use.

The lens cost me $665 in February 2009, and the Leitax and M42-PK adapters set me back about $150. I'm selling it at a loss because I need the money.

Here is a discussion of the lens in question, with sample photos:

https://www.pentaxforums.com/forums/pentax-slr-lens-discussion/74708-contax-8...-4-pentax.html









Are you the original owner of the item being sold?
No

Are you selling or trading this item?
Selling

Item Condition (Key)
Used
Excellent

Shipping Destinations
Worldwide

Shipping Charge
Included if in CONUS

Shipping Services
USPS

Accepted Payment Types
PayPal

Return Policy & Additional Details
7 day return, buyer pays return shipping

Please send me a private message if interested in the item!
Forum: Sold Items 06-27-2011, 06:43 PM  
For Sale - Sold: Zuiko 100mm f/2.8 MC adapted for Pentax K (Worldwide)
Posted By kkado
Replies: 12
Views: 5,351
It does stop down as you turn the aperture ring (meaning, no auto aperture). Removing the mount also removes the DOF preview button on the original OM mount. I have added a small spring (that can easily be removed) which keeps the aperture lever depressed.
Forum: Sold Items 06-27-2011, 04:58 PM  
For Sale - Sold: Zuiko 100mm f/2.8 MC adapted for Pentax K (Worldwide)
Posted By kkado
Replies: 12
Views: 5,351
Sorry about the late reply - I used the Voigtlander 58/1.4 SLII for the images above. The 85mm won't focus close enough. And thank you for the kind words :)
Forum: Sold Items 06-23-2011, 05:12 PM  
For Sale - Sold: Zuiko 100mm f/2.8 MC adapted for Pentax K (Worldwide)
Posted By kkado
Replies: 12
Views: 5,351
Bump with another price drop to $100 USD. Really want a K5 :)

Got the lens, unmodified in 2008, from a photog who only used it for occasional astrophotography.
Forum: Sold Items 05-23-2011, 11:17 AM  
For Sale - Sold: Zuiko 100mm f/2.8 MC adapted for Pentax K (Worldwide)
Posted By kkado
Replies: 12
Views: 5,351
Bump with price drop to $125
Forum: Sold Items 05-18-2011, 09:14 PM  
For Sale - Sold: Zuiko 100mm f/2.8 MC adapted for Pentax K (Worldwide)
Posted By kkado
Replies: 12
Views: 5,351
Zuikoholic,

I used the plain matte screen for a few months with a variety of mf lenses with reasonable success but I missed the split prism and microprism spot in my OM-2. Now I use a cheap plastic screen from eBay (about $30) and my hit rates are much better. My Zeiss 85/1.4 (with the Leitax adapter) is probably comparable in DOF to your 100mm f2, and I found it pretty difficult to focus on the stock screen. The image doesn't really pop into focus like it does in a microprism spot.

The Leitax is probably a good fit for more expensive lenses like your 100mm. Its definitely worth the price for a solid mount. I've been pondering buying another Leitax mount for my Zuiko 55/1.2 but haven't been able to justify the cost :p
Forum: Sold Items 05-18-2011, 03:38 PM  
For Sale - Sold: Zuiko 100mm f/2.8 MC adapted for Pentax K (Worldwide)
Posted By kkado
Replies: 12
Views: 5,351
PentaxForums.com Marketplace Listing

Item for Sale
Zuiko 100mm f/2.8 MC adapted for Pentax K

Asking Price
Price Reduced: 100 USD

Item Location
Hilo, Hawaii, USA

Item Description
For your consideration is an Olympus Zuiko 100mm f/2.8, the late type with better multicoating. It was originally made for the Olympus OM mount, but here I have adapted it for the Pentax K mount. I have made no alterations to the lens itself, only to the mount, in fact it is easily converted back with only a screwdriver.

Optics are pristine, with just a little dust (which does not affect the image). Cosmetics are also in great shape, other than a small (3mm) spot of paint loss on the barrel. The aperture (which is manually operated) is clean and snappy. Focus is smooth.

The adapted mount is made from a brass M42 adapter, and several pieces of copper sheet, so it is very solid. It mounts and locks onto the camera like any other K-mount lens.






I will include the original OM mount if you want to use it on an Olympus camera.

The only internal change is a small spring added to the aperture lever. If you want to change the lens back to original condition, it can be easily removed or put back in.


The lens has great colors and very smooth bokeh. Additionally, it is very contrasty and very sharp even wide open. In fact, there is little difference between f/8 and f/2.8!

Are you the original owner of the item being sold?
Yes

Are you selling or trading this item?
Selling

Item Condition (Key)
Used
Excellent

Shipping Destinations
Worldwide

Shipping Charge
Free in USA, inquire elsewhere

Shipping Services
USPS

Accepted Payment Types
PayPal

Return Policy & Additional Details
Returns accepted within 7 days if item is not as specified.

Please send me a private message if interested in the item!

---------- Post added 05-18-2011 at 12:41 PM ----------

Here are some photos from the lens on my K20D. All were shot at f/2.8.





Finally a 100% center crop at infinity, wide open
Forum: Pentax SLR Lens Discussion 05-17-2011, 03:38 PM  
C/Y mount modify to K mount
Posted By kkado
Replies: 18
Views: 10,378
Leitax does have a conversion for that lens, though only for M42. It is possible to screw on a M42 => PK adapter, and cut a small slot in the adapter mount for the locking pin. That's what I've done with my 85mm Planar and it works great. Plus with the M42 mount, you can use it on all sorts of different cameras provided that you have an adapter for it.

http://leitax.com/conversion/contax/Planar_8514/index.html
Forum: Pentax SLR Lens Discussion 05-16-2011, 03:47 PM  
C/Y mount modify to K mount
Posted By kkado
Replies: 18
Views: 10,378
I did the Planar 85mm f/1.4 Leitax conversion to M42 and it was pretty easy. Like taurus9 said, it can be difficult to remove some of the screws. Someone had tried to unscrew the mount on mine, so the heads on the screws were pretty much destroyed. I had to cut them out using a Dremel tool, which made the conversion a little more kludgey than I had hoped. If you already have the lens, I would check to see that you can disassemble the lens acceptably before buying the adapter. Good luck!

Kevin
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