Hi Gang,
I recently received my used Pentax 500/4.5. Upon uncrating, I heard some
rattles and discovered three almost paper-thin metal rings of varying sizes.
Their diameters fit on ledges just inside the optical tube at various
points. It's easy to see where they go, as it looks like the adh
Hi all,
I was just wondering -- say a fella got his hands on an A 50/1.7 that
someone had removed the aperture control contacts from. How hard would
it be to take the aperture control contacts from a damaged A 50/1.7 and
transfer them to the one that had the contacts removed? Is it a
particul
x27;t use
much glue. Just a spot or two.
I worried about damaging the lens a lot more than I worried about fixing it
right. I wasn't at all concerned about the baffle coming loose again. The
one thing I didn't want to do was make the situation worse.
Tom Reese
Subject: Lens Repair Quest
Hi Gang,
I recently received my used Pentax 500/4.5. Upon uncrating, I heard
some rattles and discovered three almost paper-thin metal rings of
varying sizes. Their diameters fit on ledges just inside the optical
tube at various points. It's easy to see where they go, as it looks
like the ad
Tom,
I'm not sure I follow where these rings are. Could you post a
better description, or perhaps a picture? I do own this lens in
K-mount
IL Bill
On Jun 13, 2005, at 11:02 AM, Tom C wrote:
Hi Gang,
I recently received my used Pentax 500/4.5. Upon uncrating, I heard
some rattles and
Illinois Bill wrote:
Tom,
I'm not sure I follow where these rings are. Could you post a better
description, or perhaps a picture? I do own this lens in K-mount
I can't post a picture without shooting some slides, getting them
processed then scanning them (that last part is hateful).
L
The Vivi S1 24-70/3.8-4.8 that I picked up last weekend ...
It will not focus past about 5 ft. The focus ring is its a stopping point.
I've not disassembled one of these before.
Any hints? Or should I chalk it up to experience?
Sincerely,
Collin Brendemuehl
http://kerygmainstitute.org
"He i
it up and see if you can fix it. Most of the old
manual lenses are not too complicated. And after all it will be a good
experience! :)
Cheers,
.t
- Original Message -
From: "Collin Brendemuehl"
To: "pdml"
Sent: Friday, May 27, 2011 1:19 AM
Subject: ot: lens repair
The hardest part is keeping the little ball bearing (that engages the
detents and provide the tactile feedback) from whizzing away when you
replace the ring. If somebody has a good trick for that, I'd love to
know what it is. (I can tell you that it is a good idea to work at the
reassembly [if not
On 5/1/2012 2:23 PM, Darren Addy wrote:
The hardest part is keeping the little ball bearing (that engages the
detents and provide the tactile feedback) from whizzing away when you
replace the ring. If somebody has a good trick for that, I'd love to
know what it is. (I can tell you that it is a go
: Re: Lens repair question
On 5/1/2012 2:23 PM, Darren Addy wrote:
The hardest part is keeping the little ball bearing (that engages the
detents and provide the tactile feedback) from whizzing away when you
replace the ring. If somebody has a good trick for that, I'd love to
know what it i
nt: Tuesday, May 01, 2012 3:38 PM
> To: Pentax-Discuss Mail List
> Subject: Re: Lens repair question
>
>
> On 5/1/2012 2:23 PM, Darren Addy wrote:
>>
>> The hardest part is keeping the little ball bearing (that engages the
>> detents and provide the tactile feedback)
The problem is that the ball bearing is held "high" by a spring beneath it.
You must compress the spring so the ball bearing is low enough to slip
the aperture ring over.
Now imagine trying to keep the ball bearing "down" as you slide the
ring one. As you slide the ring, whatever you were holding t
1) If you don't need to fix the A50/1.7 you have now, don't disassemble it !!!
2) If you are bound and determined to disassemble it, then
a) go into the kitchen where you have good light and a vinyl floor.
b) do the disassembly in a big tray with tall sides (like for
breakfast in bed).
c
On Tue, May 01, 2012 at 09:15:40PM -0500, Darren Addy wrote:
> The problem is that the ball bearing is held "high" by a spring beneath it.
> You must compress the spring so the ball bearing is low enough to slip
> the aperture ring over.
> Now imagine trying to keep the ball bearing "down" as you s
Hey Darren how about a feeler gauge? Thin, tough, metal blades. Just a thought.
Ted
"The eye of the viewer becomes the eye of the Photographer." Albert Maysles
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On Tue, May 01, 2012 at 10:09:35PM -0700, Theodore Beilby wrote:
> Hey Darren how about a feeler gauge? Thin, tough, metal blades. Just a
> thought.
Is there an echo in here?
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I've repaired a number of the A50/1.7 lenses.
The most common issue was the leaf spring being
separated from the body because of the plastic
aperture ring.
Keeping track of that detente bearing
was sometimes difficult. In the end, the
best way that I found was to just smear
some of the lens lu
Ah, I see.
This is clearly a task best left to people who know what they're doing.
I thought maybe, for once, it might be a reasonably simple fix. I'll
just leave it be and use it as an M lens until I find that "Free Lens
Repair" place nobody's been talking about.
Thanks to all for the input
Thanks, Collin.
I'll keep that in mind if I should decide to take up the task one day.
But, based on what I've read so far, I should probably leave things well
enough alone until the day I'm swimming in A 50/1.7's and don't mind
losing one or two.
-- Walt
On 5/2/2012 7:33 AM, Collin Brendem
When in doubt … send it to Essex in New Jersey.
On May 2, 2012, at 7:45 AM, Walt Gilbert wrote:
> Ah, I see.
>
> This is clearly a task best left to people who know what they're doing. I
> thought maybe, for once, it might be a reasonably simple fix. I'll just leave
> it be and use it as an M
On Wed, May 2, 2012 at 7:56 AM, Jeffery Smith wrote:
>> This is clearly a task best left to people who know what they're doing. I
>> thought maybe, for once, it might be a reasonably simple fix. I'll just
>> leave it be and use it as an M lens until I find that "Free Lens Repair"
>> place nobod
From: Bob Sullivan
1) If you don't need to fix the A50/1.7 you have now, don't disassemble it !!!
I understood he has two broken lenses with different problems & he's
proposing to disassemble them to see if he can merge them into one
functional lens as a back-up for his good operational A50/
If he has a good, operational A50/1.7, then leave well enough alone.
Regards, Bob S.
On Wed, May 2, 2012 at 9:15 AM, John Sessoms wrote:
> From: Bob Sullivan
>>
>> 1) If you don't need to fix the A50/1.7 you have now, don't disassemble
>> it !!!
>
>
> I understood he has two broken lenses with
On 5/2/2012 9:15 AM, John Sessoms wrote:
From: Bob Sullivan
1) If you don't need to fix the A50/1.7 you have now, don't
disassemble it !!!
I understood he has two broken lenses with different problems & he's
proposing to disassemble them to see if he can merge them into one
functional lens
Feeler gauge is exactly what I was thinking - the flat blade type, not,
obviously, the wire type. The flat blades will give you some pretty
thin options.
-p
On 5/1/2012 11:29 PM, John Francis wrote:
On Tue, May 01, 2012 at 09:15:40PM -0500, Darren Addy wrote:
The problem is that the ball be
I like the feeler gauge idea and i have one around somewhere...
Thanks to those that responded with that.
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On 5/2/12 14:45, Walt Gilbert wrote:
Ah, I see.
This is clearly a task best left to people who know what they're
doing. I thought maybe, for once, it might be a reasonably simple fix.
I don't think you ought to be too put off by the comments here. Yes, the
ball bearing thing makes it all a bit
On 5/2/2012 11:11 AM, Toralf Lund wrote:
On 5/2/12 14:45, Walt Gilbert wrote:
Ah, I see.
This is clearly a task best left to people who know what they're
doing. I thought maybe, for once, it might be a reasonably simple fix.
I don't think you ought to be too put off by the comments here. Yes,
On 5/2/12 18:18, Walt Gilbert wrote:
On 5/2/2012 11:11 AM, Toralf Lund wrote:
On 5/2/12 14:45, Walt Gilbert wrote:
Ah, I see.
This is clearly a task best left to people who know what they're
doing. I thought maybe, for once, it might be a reasonably simple fix.
I don't think you ought to be t
From: Walt Gilbert
Ah, I see.
This is clearly a task best left to people who know what they're doing.
Or you could send them to Cotty.
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On 5/2/2012 11:44 AM, John Sessoms wrote:
From: Walt Gilbert
Ah, I see.
This is clearly a task best left to people who know what they're doing.
Or you could send them to Cotty.
I suppose I could do that, but I kind of like Cotty and would hate for
him to see what I did to that poor lens.
On May 2, 2012, at 10:04 AM, Walt Gilbert wrote:
> On 5/2/2012 11:44 AM, John Sessoms wrote:
>> From: Walt Gilbert
>>
>>> Ah, I see.
>>>
>>> This is clearly a task best left to people who know what they're doing.
>>
>> Or you could send them to Cotty.
>>
> I suppose I could do that, but I kin
On 5/2/2012 1:04 PM, Walt Gilbert wrote:
On 5/2/2012 11:44 AM, John Sessoms wrote:
From: Walt Gilbert
Ah, I see.
This is clearly a task best left to people who know what they're doing.
Or you could send them to Cotty.
I suppose I could do that, but I kind of like Cotty and would hate for
On 5/2/2012 12:28 PM, P. J. Alling wrote:
On 5/2/2012 1:04 PM, Walt Gilbert wrote:
On 5/2/2012 11:44 AM, John Sessoms wrote:
From: Walt Gilbert
Ah, I see.
This is clearly a task best left to people who know what they're
doing.
Or you could send them to Cotty.
I suppose I could do that, b
On 5/2/2012 12:23 PM, Larry Colen wrote:
On May 2, 2012, at 10:04 AM, Walt Gilbert wrote:
On 5/2/2012 11:44 AM, John Sessoms wrote:
From: Walt Gilbert
Ah, I see.
This is clearly a task best left to people who know what they're doing.
Or you could send them to Cotty.
I suppose I could do
Feeler gauge is unnecessary.
If there is some grease holding it in place,
just pressing it down with your finger while
sliding the aperture ring over it is adequate.
Sincerely,
Collin Brendemuehl
"He is no fool who gives what he cannot keep to gain what he cannot lose"
-- Jim Elliott
--
If you decide to take it apart, document and mark every single step so
you can get it back together properly.
When I've taken apart primes, getting the helical screwed back on
properly is a PITA. Also, be careful of the grease. If you wipe off
too much, you may have problems with smooth turning
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