Salvageable fungus?

tim60 · 05-10-2014, 09:49 PM

It is very important to know if the screws are Phillips or JIS. At first glace they look similar BUT Phillips driver in JIS screw will strip the screwhead. JIS screws are common in the older Japanese lenses.

I got a set of JIS screwdrivers by looking on Amazon and searching for something like JIS screwdriver. There are not many suppliers, and I got one set of four tips and a handle for about USD15 and some trivial shopping cost (US to Australia). Nice way to use a $25 gift card I was given for a little recording job I did about online teaching for a University where I do some.

kh1234567890 · 05-11-2014, 02:06 AM

Originally posted by tim60

It is very important to know if the screws are Phillips or JIS. At first glace they look similar BUT Phillips driver in JIS screw will strip the screwhead. JIS screws are common in the older Japanese lenses.

Every boy (or girl) should have one of these

Not a Number · 05-11-2014, 08:02 AM

JIS drivers are compatible with Philips head screws. Where as Philips drivers are not completely compatible with JIS screws. Prior to adopting the JIS standard for lens manufacture single slotted screws were the usual norm. I think the switch over was late 60's early 70's.

tim60 · 05-11-2014, 12:14 PM

The Phillips head was earlier than that:
Henry F. Phillips - Wikipedia, the free encyclopedia

Some technical detail about the difference:
When a Phillips is not a Phillips! : JIS - Japanese Industrial Standard

I cannot find a date for the JIS head design.

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05-10-2014, 09:49 PM	#16
tim60 Pentaxian Join Date: Apr 2011 Photos: Albums Posts: 8,758	It is very important to know if the screws are Phillips or JIS. At first glace they look similar BUT Phillips driver in JIS screw will strip the screwhead. JIS screws are common in the older Japanese lenses. I got a set of JIS screwdrivers by looking on Amazon and searching for something like JIS screwdriver. There are not many suppliers, and I got one set of four tips and a handle for about USD15 and some trivial shopping cost (US to Australia). Nice way to use a $25 gift card I was given for a little recording job I did about online teaching for a University where I do some.

05-11-2014, 02:06 AM	#17
kh1234567890 Veteran Member Join Date: Sep 2010 Location: Manchester, UK Photos: Gallery Posts: 2,653	Originally posted by tim60 It is very important to know if the screws are Phillips or JIS. At first glace they look similar BUT Phillips driver in JIS screw will strip the screwhead. JIS screws are common in the older Japanese lenses. Every boy (or girl) should have one of these

05-11-2014, 08:02 AM	#18
Not a Number Moderator Join Date: Mar 2012 Location: Venice, CA Posts: 10,526	JIS drivers are compatible with Philips head screws. Where as Philips drivers are not completely compatible with JIS screws. Prior to adopting the JIS standard for lens manufacture single slotted screws were the usual norm. I think the switch over was late 60's early 70's.

05-11-2014, 12:14 PM	#19
tim60 Pentaxian Join Date: Apr 2011 Photos: Albums Posts: 8,758	The Phillips head was earlier than that: Henry F. Phillips - Wikipedia, the free encyclopedia Some technical detail about the difference: When a Phillips is not a Phillips! : JIS - Japanese Industrial Standard I cannot find a date for the JIS head design.