Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
08-10-2019, 05:40 AM   #1
Site Supporter
Site Supporter




Join Date: Nov 2015
Photos: Albums
Posts: 1,359
Lens spanner for deep diving

So my Tokina 400mm f5.6 (the old RMC manual focus one) has fungus on an inner element.

Iíve used my spanner (the kind that looks like #) to remove the rear element, but the spanner wonít fit that far down into the lens to get the next one.

I tried a pair of dividers and they wouldnít clear, either.

And the two screwdrivers trick gets me into the slots, but I canít put any torque on them...

Is there anything Iím overlooking? Or an alternative tool I should try?

For my next go, Iím going to try a credit card cut to size, but Iím not optimistic

-Eric

08-10-2019, 05:54 AM   #2
Site Supporter
Site Supporter




Join Date: Nov 2012
Location: North Wales
Photos: Gallery | Albums
Posts: 2,068
This lens is found in various incarnations: tokina, hoya, mitsuki and vivitar TX v2. I had the rear element off my viv easily enough, it unscrews complete with rear baffle. I take it you're trying to get at the next element in. Like you my straight ended lens spanner won't do it, not without taking off all the mount to improve the access (why didn't I get one with curved ends?). I think that's what you have to do, or successfully improvise (an old steel workshop 12" ruler, trimmed to fit...).

Last edited by marcusBMG; 08-10-2019 at 06:18 AM.
08-10-2019, 05:56 AM   #3
Loyal Site Supporter
Loyal Site Supporter




Join Date: May 2007
Location: Flagstaff, Arizona
Posts: 469
Have you got a friend with a machine shop? You could have something fashioned out of a piece of metal - rather like the credit card you are imagining, but a lot stiffer & stronger. Or, try to find a thicker piece of plastic from which to fashion it.
08-10-2019, 11:48 AM   #4
Moderator
Not a Number's Avatar

Join Date: Mar 2012
Location: Venice, CA
Posts: 6,242
Use a couple pieces of wood, a couple small C-clamps or nuts and bolts to hold the two screwdrivers together.

08-11-2019, 03:36 PM   #5
Loyal Site Supporter
Loyal Site Supporter




Join Date: May 2007
Location: Flagstaff, Arizona
Posts: 469
I think Not a Number might be envisioning something like this.

I conjured this up when I had to remove the nut from my toilet tank to toilet bowl connection. The span is more than 2 inches, and I had no wrench large enough. The metal pieces are aluminum bar stock about 1/8" thick and 1/2" wide. (The holes in the block of wood are from another project - but drilling something like that to hold your screwdrivers might be just the ticket.)

(Sorry 'bout the Canon picture!)
Attached Images
View Picture EXIF
Canon PowerShot G15  Photo 

Last edited by AstroDave; 08-11-2019 at 04:05 PM.
08-17-2019, 08:20 AM   #6
Site Supporter
Site Supporter




Join Date: Nov 2015
Photos: Albums
Posts: 1,359
Original Poster
QuoteOriginally posted by AstroDave Quote
I think Not a Number might be envisioning something like this.

I conjured this up when I had to remove the nut from my toilet tank to toilet bowl connection. The span is more than 2 inches, and I had no wrench large enough. The metal pieces are aluminum bar stock about 1/8" thick and 1/2" wide. (The holes in the block of wood are from another project - but drilling something like that to hold your screwdrivers might be just the ticket.)

(Sorry 'bout the Canon picture!)
That's an interesting approach.
I'll have to see if I can find something that can get all the way in there, be thin enough to fit the slots, and be strong enough to not bend...

I may have to find some metal and cut it to size instead.
I tried the credit card (thanks, Visa, for the new card this month...) method, but the plastic isn't rigid enough and just bends until it falls out of the slot.
But the card may be perfect as a template...



---------- Post added 08-17-19 at 08:25 AM ----------

QuoteOriginally posted by AstroDave Quote
Have you got a friend with a machine shop? You could have something fashioned out of a piece of metal - rather like the credit card you are imagining, but a lot stiffer & stronger. Or, try to find a thicker piece of plastic from which to fashion it.
"Have you got a friend with a machine shop" is like the engineer's version of "hey, hold my beer while I..."

Though I guess the real engineer's version is "do you like this new $3,000 machine? I needed it to make this $3 tool..."

I don't, but my mother has a bench grinder, and I have a dremel, so if I can find the right piece of metal stock to turn into a tool...

-Eric

Last edited by TwoUptons; 08-17-2019 at 08:26 AM.
08-17-2019, 08:43 AM   #7
Site Supporter
Site Supporter
c.a.m's Avatar

Join Date: Jan 2013
Location: Ottawa, Canada
Posts: 1,843
QuoteOriginally posted by TwoUptons Quote
Is there anything I’m overlooking? Or an alternative tool I should try?
I needed a narrow, long-tipped spanner for a repair job on a rangefinder (Olympus or Canon, don't recall exactly).

One of my lens spanners of the '#' variety has interchangeable tips. Similar to this: https://www.amazon.com/Neewer-Camera-Lens-Openning-Repairing/dp/B0734PH87W/r...gateway&sr=8-7


I bought two inexpensive small screwdriver sets, and modified the smallest driver to make two custom tips for the spanner.

There are many such 'precision' screwdriver sets; here's an example:6PCS Mini Screwdriver Set with Case, Precision Screwdriver Kit with 6 Different Size Flathead and Phillips Screwdrivers, Perfect mini Screwdriver Bits for Jewelry, Watch, Eyeglass Repair. - - amazon.com?tag=pentaxforums-20&

Select the driver size for which the knurled shaft will fit the spanner (there may be a slight slop in the fit, but the spanner screw will tighten it). Cut the knurled shaft to an appropriate length, and modify the tips for your purpose -- use a Dremel tool.

The drivers are not high strength -- what do you expect for $5? -- but mine worked fine for my job. This approach could work on your lens, depending on the reach that you need.

- Craig

Last edited by c.a.m; 08-17-2019 at 08:49 AM.
Reply

Bookmarks
  • Submit Thread to Facebook Facebook
  • Submit Thread to Twitter Twitter
  • Submit Thread to Digg Digg
Tags - Make this thread easier to find by adding keywords to it!
card, credit, element, friend, lens, lens spanner, machine, metal, pentax service, piece, plastic, repair, service, spanner, stock, version, warranty
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
Could anyone recommend a good set of JIS screwdrivers and spanner? ZombieArmy General Photography 21 05-25-2019 03:25 PM
Spanner wrench substitutes pacerr Maintenance and Repair Articles 21 10-17-2012 07:48 AM
Nature Deep Deep Pink eaglem Post Your Photos! 11 05-19-2012 07:50 AM
What lens spanner to get? kcobain1992 Pentax SLR Lens Discussion 6 10-09-2011 11:48 AM
Spanner tool photolady95 Troubleshooting and Beginner Help 24 05-28-2011 06:50 PM



All times are GMT -7. The time now is 05:08 AM. | See also: NikonForums.com, CanonForums.com part of our network of photo forums!
  • Red (Default)
  • Green
  • Gray
  • Dark
  • Dark Yellow
  • Dark Blue
  • Old Red
  • Old Green
  • Old Gray
  • Dial-Up Style
Hello! It's great to see you back on the forum! Have you considered joining the community?
register
Creating a FREE ACCOUNT takes under a minute, removes ads, and lets you post! [Dismiss]
Top