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Hamster · 01-03-2010, 09:08 AM

I picked up my beatup M-fifties today and notice a bit of a rattle when I shake it.

Is it normal?

I know this happens with Takumars when one of the three screws holding the optical block become loose. Is the M-Series similar in construction?

**Just1MoreDave** · 01-03-2010, 10:27 AM

There's a normal amount of rattle in the aperture mechanism. It can be reduced by holding the aperture lever when you're shaking. The mechanism on screw-mount Takumars either doesn't move as much, or noises are better contained within the screw mount.

8540tomg · 01-03-2010, 10:36 AM

I bought my M 50/1.4 new in 1982. It was the first lens I bought for my first 35mm SLR, a Pentax MX. It has always had a bit of a rattle in it. I suspect it is a bit of loose play in the aperture mechanism as suggested above.

It can be a little annoying but it has had no effect on image making in the 28 years I have had this lens. I don't think it is a cause for concern.

Tom G

sbbtim · 01-03-2010, 01:41 PM

Mine rattles, too. When I hold the aperture lever to wide open, no rattles whatsoever...

stevebrot · 01-03-2010, 02:57 PM

Yep! My M 50/1.7 rattles when off the camera and did so even when new. Silent, when mounted. This is a fairly well-documented characteristic of the lens and a fairly frequent question from new owners.

Steve

pop4 · 01-03-2010, 05:39 PM

My M 50/1.7 is a rattler

flockofbirds · 01-03-2010, 07:41 PM

M 50 1.4
it rattles

shizmo · 01-04-2010, 12:55 AM

My 50m f1.7 definitly rattles. Gives it character

**wtlwdwgn** · 01-04-2010, 12:19 PM

Yep. Doesn't effect its performance though.

01-03-2010, 09:08 AM	#1
Hamster Junior Member Join Date: Jul 2009 Posts: 44	Does your Pentax-m 50mm/1.4, 50mm/1.7 rattle I picked up my beatup M-fifties today and notice a bit of a rattle when I shake it. Is it normal? I know this happens with Takumars when one of the three screws holding the optical block become loose. Is the M-Series similar in construction?

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01-03-2010, 10:27 AM	#2
Just1MoreDave Site Supporter Join Date: Feb 2007 Location: Aurora, CO Photos: Gallery \| Albums Posts: 6,340	There's a normal amount of rattle in the aperture mechanism. It can be reduced by holding the aperture lever when you're shaking. The mechanism on screw-mount Takumars either doesn't move as much, or noises are better contained within the screw mount.

01-03-2010, 10:36 AM	#3
8540tomg Veteran Member Join Date: Feb 2008 Location: Waterloo, Ontario Photos: Gallery Posts: 4,461	I bought my M 50/1.4 new in 1982. It was the first lens I bought for my first 35mm SLR, a Pentax MX. It has always had a bit of a rattle in it. I suspect it is a bit of loose play in the aperture mechanism as suggested above. It can be a little annoying but it has had no effect on image making in the 28 years I have had this lens. I don't think it is a cause for concern. Tom G

01-03-2010, 01:41 PM	#4
sbbtim Senior Member Join Date: Oct 2009 Photos: Albums Posts: 125	Mine rattles, too. When I hold the aperture lever to wide open, no rattles whatsoever...

01-03-2010, 02:57 PM	#5
stevebrot Otis Memorial Pentaxian Join Date: Mar 2007 Location: Vancouver (USA) Photos: Gallery \| Albums Posts: 42,007	Yep! My M 50/1.7 rattles when off the camera and did so even when new. Silent, when mounted. This is a fairly well-documented characteristic of the lens and a fairly frequent question from new owners. Steve

01-03-2010, 05:39 PM	#6
pop4 Veteran Member Join Date: Aug 2007 Location: YMML Photos: Gallery Posts: 1,879	My M 50/1.7 is a rattler

01-03-2010, 07:41 PM	#7
flockofbirds Senior Member Join Date: Aug 2009 Location: Oregon, USA Photos: Gallery Posts: 178	M 50 1.4 it rattles

01-04-2010, 12:55 AM	#8
shizmo New Member Join Date: Nov 2009 Location: Perth, WA Photos: Gallery Posts: 22	My 50m f1.7 definitly rattles. Gives it character

01-04-2010, 12:19 PM	#9
wtlwdwgn Site Supporter Join Date: Jan 2007 Location: Billings, MT Photos: Gallery \| Albums Posts: 13,853	Yep. Doesn't effect its performance though.

Does your Pentax-m 50mm/1.4, 50mm/1.7 rattle

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