Pentax K1000 | Part 4 - Viewfinder Cleaning

I disassemble the viewfinder assembly, remove the old degraded foam, cut and install new foam and clean the focusing screen until it's spotless. The entire repair can be found in the Pentax K1000 playlist.
• Pentax K1000 Overhaul
For more information about repairing a Pentax K1000, check out the Repair Guide from National Camera Repair, available on learncamerarepair.com.
learncamerarepair.com/product...
----------------------------------------------------------------------------------------------
Tools and Supplies
Srozum's Film Camera Tester: bit.ly/3Gh6ftN
Vessel JIS Screwdrivers: bit.ly/3uyr1md
Stainless Steel Tweezers: bit.ly/49n0O99
Spanner Wrench: bit.ly/3QTwXhb
Rubber Grippers: bit.ly/40VQEJG
NyOil Shutter Oil: www.micro-tools.com/products/...
Helicoid Grease (#10 and #30): bit.ly/46xr8M7
Light Seal Foam (1.5 mm): bit.ly/47xOkek
Kimwipes: www.micro-tools.com/products/...
Extech EX330 Multimeter: bit.ly/47wcOEW
Kotto Solder Sucker: bit.ly/3RiDYJS
Generic Supplies: Isopropyl alcohol, naphtha, cotton buds, contact cement
----------------------------------------------------------------------------------------------
Video Setup
Over shoulder cam: Panasonic GH2, Pentax-M 28mm f2.8
Front cam: Panasonic GH2, Olympus 14-42mm f3.5-5.6
Overhead cam: Panasonic GH2, Panasonic 45mm f2.8 Macro
Voiceover: Rode Video Micro
----------------------------------------------------------------------------------------------
Background music is yesterday by Jahzzar sourced from the Free Music Archive and licensed under CC BY-SA 4.0.
freemusicarchive.org/music/Ja...
creativecommons.org/licenses/...
00:00 Introduction
00:08 Mirror Box Foam Removal
01:55 Viewfinder Disassembly
04:28 Viewfinder Foam Removal
07:43 Focusing Screen Cleaning
10:27 Installing Viewfinder Seals
13:33 Viewfinder Reassembly
16:38 Installing Mirror Box Seals

[@ytuberization]

Incredible focus on details. Many thanks for sharing. Would be good to learn more about the parts you will lubricate around the shutter and other relevant mechanisms.

[@SamsCameraBench]

Thanks much. Definitely plan on covering the critical lubrication points in the shutter video.

[@kiss4luna]

I just bought a K1000 which may be made in China, excited to check if it uses different viewfinder design

[@walkermack7139]

Lovely tutorial! Following along at home! Do you plan on doing a reassembly/rewiring video?

[@SamsCameraBench]

Yep. I'm planning a whole video dedicated to rewiring and calibrating the light meter. Probably after one or two videos on the shutter. Not sure exactly what the schedule will be.

[@andreikudriavtsev4355]

It looks dangerous. I lost some prisms trying to get off the old adhesive tape with old foam. Even after adding ethanol, the prism coating often comes off

[@SamsCameraBench]

Shoot, that sucks. I wonder if the foam had already done its damage by the time you got to it. I asked some other more experienced camera repair folks and pretty much everyone recommended cleaning out the foam in this situation. But it could be one of those cases with no perfect solution. Each choice has its own risks.

[@andreikudriavtsev4355]

@@SamsCameraBench thanks for your reply and recommendations. You have wonderful videos. It’s just my observation, maybe the paint was already weakened under foam. Twice, I got degraded prisms from good one. I don't know where I went wrong, 96% isopropyl alcohol is not supposed to degrade paint. Now I'm afraid even to breathe on the prism. I remove the foam but save the old adhesive tape, and apply the new foam to the wall around the prism.