SMC PENTAX 1:3.5 19mm with haze

huge10 · 11-25-2020, 03:04 PM

I was lucky enough to acquire a sample of this lens at really low cost. Now I have tested it on my K1MkII it shows heavy flare. Looking through the glass I can see the haze inside.
I suspect the haze is caused by dust/oil/whatever on the lens surfaces of the front and back lens group facing the aperture. I would feel confident to get these lens groups out if these each can be removed as one block. That would give access to the surfaces to be cleaned.

Does anybody have info on how to get these lens groups removed? Would be of great help and give me confidence to get the job done sucessfully!

Regards,

Last edited by huge10; 11-26-2020 at 11:35 AM. Reason: Error in title

pschlute · 11-25-2020, 03:44 PM

I expect you mean 15mm or 18mm ?

If it is fungus or balsam separation your job cleaning it may be tougher.

**DWS1** · 11-25-2020, 06:10 PM

Originally posted by pschlute

I expect you mean 15mm or 18mm ?

If it is fungus or balsam separation your job cleaning it may be tougher.

This is my thought as well.

**UncleVanya** · 11-25-2020, 11:26 PM

If it's the 18mm or the 15 only a single pair of elements is listed as a group according to the tables on the forum (although the images of the lens elements imply more groups to me)

SMC Pentax 15mm F3.5 Reviews - K Prime Lenses - Pentax Lens Reviews & Lens Database

SMC Pentax 18mm F3.5 Reviews - K Prime Lenses - Pentax Lens Reviews & Lens Database

huge10 · 11-26-2020, 11:39 AM

Originally posted by UncleVanya

If it's the 18mm or the 15 only a single pair of elements is listed as a group according to the tables on the forum (although the images of the lens elements imply more groups to me)

SMC Pentax 15mm F3.5 Reviews - K Prime Lenses - Pentax Lens Reviews & Lens Database

SMC Pentax 18mm F3.5 Reviews - K Prime Lenses - Pentax Lens Reviews & Lens Database

Thank you. Now I see where the aperture is. Still not sure if the front and back lens groups both come in one block. That would ease the disassembly to clean internally.

---------- Post added 11-26-20 at 11:49 AM ----------

Originally posted by huge10

Thank you. Now I see where the aperture is. Still not sure if the front and back lens groups both come in one block. That would ease the disassembly to clean internally.

Oops, looked at the 15mm. In the 18mm drawing there is no aperture.

**UncleVanya** · 11-26-2020, 08:06 PM

Yes. Aperture isn't always clearly called out in all the lens diagrams.

11-25-2020, 03:04 PM	#1
huge10 Forum Member Join Date: Mar 2018 Location: Apeldoorn, The Netherlands Posts: 62	SMC PENTAX 1:3.5 18mm with haze I was lucky enough to acquire a sample of this lens at really low cost. Now I have tested it on my K1MkII it shows heavy flare. Looking through the glass I can see the haze inside. I suspect the haze is caused by dust/oil/whatever on the lens surfaces of the front and back lens group facing the aperture. I would feel confident to get these lens groups out if these each can be removed as one block. That would give access to the surfaces to be cleaned. Does anybody have info on how to get these lens groups removed? Would be of great help and give me confidence to get the job done sucessfully! Regards, Last edited by huge10; 11-26-2020 at 11:35 AM. Reason: Error in title

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11-25-2020, 03:44 PM	#2
pschlute Moderator Loyal Site Supporter Join Date: Mar 2007 Location: Surrey, UK Photos: Gallery Posts: 8,211	I expect you mean 15mm or 18mm ? If it is fungus or balsam separation your job cleaning it may be tougher.

11-25-2020, 06:10 PM	#3
DWS1 Site Supporter Join Date: Aug 2018 Location: Arkansas, USA Posts: 1,169	Originally posted by pschlute I expect you mean 15mm or 18mm ? If it is fungus or balsam separation your job cleaning it may be tougher. This is my thought as well.

11-25-2020, 11:26 PM	#4
UncleVanya Loyal Site Supporter Join Date: Jul 2014 Photos: Gallery \| Albums Posts: 28,445	If it's the 18mm or the 15 only a single pair of elements is listed as a group according to the tables on the forum (although the images of the lens elements imply more groups to me) SMC Pentax 15mm F3.5 Reviews - K Prime Lenses - Pentax Lens Reviews & Lens Database SMC Pentax 18mm F3.5 Reviews - K Prime Lenses - Pentax Lens Reviews & Lens Database

11-26-2020, 11:39 AM	#5
huge10 Forum Member Join Date: Mar 2018 Location: Apeldoorn, The Netherlands Posts: 62 Original Poster	Originally posted by UncleVanya If it's the 18mm or the 15 only a single pair of elements is listed as a group according to the tables on the forum (although the images of the lens elements imply more groups to me) SMC Pentax 15mm F3.5 Reviews - K Prime Lenses - Pentax Lens Reviews & Lens Database SMC Pentax 18mm F3.5 Reviews - K Prime Lenses - Pentax Lens Reviews & Lens Database Thank you. Now I see where the aperture is. Still not sure if the front and back lens groups both come in one block. That would ease the disassembly to clean internally. ---------- Post added 11-26-20 at 11:49 AM ---------- Originally posted by huge10 Thank you. Now I see where the aperture is. Still not sure if the front and back lens groups both come in one block. That would ease the disassembly to clean internally. Oops, looked at the 15mm. In the 18mm drawing there is no aperture.

11-26-2020, 08:06 PM	#6
UncleVanya Loyal Site Supporter Join Date: Jul 2014 Photos: Gallery \| Albums Posts: 28,445	Yes. Aperture isn't always clearly called out in all the lens diagrams.