Lines On 645N Negatives

lightproof · 05-09-2018, 02:57 PM

stevebrot, thanks for the reply!

Originally posted by stevebrot

In the OP's case it was probably oxidized lubricant (or similar) slowing the leading curtain near the end of its travel.

I suppose the lubricant could oxidize even in almost new camera if it have not been used for long time (a decade or so) as it probably was in my case. I only hope it's the type of repair any regular qualified photo service technician could perform relatively easy. I don't have an option of sending my camera to Eric as I'm not in the US.

stevebrot · 05-09-2018, 05:14 PM

Originally posted by lightproof

I suppose the lubricant could oxidize even in almost new camera if it have not been used for long time (a decade or so) as it probably was in my case.

Time is the enemy of all things made. As for service options, the service center for Pentax in Russia may be able to help you.

Steve

asahijock · 05-22-2018, 01:07 PM

I have just read this thread as I have a P645N also and had failed to notice that it was many years old. I even made a contribution myself . If the OP did find a solution it is always a pity when he/she doesn't come back with what the solution was as it may help others who run into the same issue.

asahijock

eaaronross · 05-22-2018, 09:32 PM

Personally, I ran another roll through it just to see what would happen and everything worked perfect again! I'm going to keep using it and see what happens. One thing I did different that trip is I was always using the strap hung off my backpack, and at home I never use the strap at all. I wonder if that could have pulled in the body in some way to make a light leak or cause a mechanical problem. I also switched out the batteries for fresh ones just incase.
¯\_(ツ)_/¯

tomfrh · 07-11-2018, 06:45 AM - **2 Likes**

I've figured this problem out.

It’s not the shutter, it's a light leak where the back meets the body.

Light gets thru the gap and shines on the most recently shot frame, which is partially rolled up onto the top reel. The line is a shadow cast by the reel. See this diagram.

SOLUTION: New seals, or a new back, or black electrical tape to seal up your leaky gaps.

**Bonner04** · 07-13-2018, 08:20 AM - **1 Like**

I just replaced the foam on one of my 645 backs. Found a seller on eBay that has precut kits that are very cheap.

jamesvdm · 12-05-2019, 05:11 AM

I am experiencing the same lines on my 645n negatives, only running perpendicular to the OP. E.g. they run side to side in portrait orientation.

Update: My problem was in processing, not in camera.

Last edited by jamesvdm; 03-20-2020 at 06:02 AM.

**Bonner04** · 12-06-2019, 09:17 PM

I had one back that gave me lines and I also bought the pre-cut foam from an eBay seller. No more leaks.

07-11-2018, 06:45 AM - 2 Likes	#35
tomfrh New Member Join Date: Jul 2018 Posts: 1	Solved I've figured this problem out. It’s not the shutter, it's a light leak where the back meets the body. Light gets thru the gap and shines on the most recently shot frame, which is partially rolled up onto the top reel. The line is a shadow cast by the reel. See this diagram. SOLUTION: New seals, or a new back, or black electrical tape to seal up your leaky gaps. Attached Images

12-06-2019, 09:17 PM	#38
Bonner04 Loyal Site Supporter Join Date: Jan 2016 Location: Ventura, CA Photos: Gallery Posts: 685	Same I had one back that gave me lines and I also bought the pre-cut foam from an eBay seller. No more leaks.

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05-09-2018, 02:57 PM	#31
lightproof New Member Join Date: May 2017 Posts: 12	stevebrot, thanks for the reply! Originally posted by stevebrot In the OP's case it was probably oxidized lubricant (or similar) slowing the leading curtain near the end of its travel. I suppose the lubricant could oxidize even in almost new camera if it have not been used for long time (a decade or so) as it probably was in my case. I only hope it's the type of repair any regular qualified photo service technician could perform relatively easy. I don't have an option of sending my camera to Eric as I'm not in the US.

05-09-2018, 05:14 PM	#32
stevebrot Otis Memorial Pentaxian Join Date: Mar 2007 Location: Vancouver (USA) Photos: Gallery \| Albums Posts: 42,007	Originally posted by lightproof I suppose the lubricant could oxidize even in almost new camera if it have not been used for long time (a decade or so) as it probably was in my case. Time is the enemy of all things made. As for service options, the service center for Pentax in Russia may be able to help you. Steve

05-22-2018, 01:07 PM	#33
asahijock Senior Member Join Date: Mar 2011 Location: Northants, England Posts: 167	I have just read this thread as I have a P645N also and had failed to notice that it was many years old. I even made a contribution myself . If the OP did find a solution it is always a pity when he/she doesn't come back with what the solution was as it may help others who run into the same issue. asahijock

05-22-2018, 09:32 PM	#34
eaaronross New Member Join Date: Mar 2018 Posts: 2	Personally, I ran another roll through it just to see what would happen and everything worked perfect again! I'm going to keep using it and see what happens. One thing I did different that trip is I was always using the strap hung off my backpack, and at home I never use the strap at all. I wonder if that could have pulled in the body in some way to make a light leak or cause a mechanical problem. I also switched out the batteries for fresh ones just incase. ¯\_(ツ)_/¯

07-13-2018, 08:20 AM - 1 Like	#36
Bonner04 Loyal Site Supporter Join Date: Jan 2016 Location: Ventura, CA Photos: Gallery Posts: 685	I just replaced the foam on one of my 645 backs. Found a seller on eBay that has precut kits that are very cheap.

12-05-2019, 05:11 AM	#37
jamesvdm New Member Join Date: Dec 2018 Location: Perth, Western Australia Posts: 12	I am experiencing the same lines on my 645n negatives, only running perpendicular to the OP. E.g. they run side to side in portrait orientation. Update: My problem was in processing, not in camera. Last edited by jamesvdm; 03-20-2020 at 06:02 AM.