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How to fix a dent
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PostPosted: Fri Aug 13, 2010 5:40 am    Post subject: How to fix a dent Reply with quote

how do you guys deal with such damages on lenses filter thread?
I want to repair one lens but don't want to use pliers


PostPosted: Fri Aug 13, 2010 5:51 am    Post subject: Reply with quote

Hi
I just moved your question to here as it is the right forum for it.Have you used the search function...I know this subject has been asked before.There is a special filter tool sold by member Alex from Hong kong but I am unsure if you can contact him at the moment.
Some one else may have a better idea... Very Happy
I found this link http://forum.mflenses.com/lens-filter-thread-repair-tool-any-interest-t27125,highlight,filter+dent+removal.html


PostPosted: Fri Aug 13, 2010 6:14 am    Post subject: Reply with quote

great, thanks, looks like a great tool Wink


PostPosted: Fri Aug 13, 2010 6:53 am    Post subject: Reply with quote

Great if you can get one. Wink

Unfortunate but necessary reading:
http://forum.mflenses.com/alex-t29679.html
http://forum.mflenses.com/alex-hk300-t30505.html


If you can't acquire one of the "real" tools, here is a DIY option:
http://www.kyphoto.com/classics/filterringtool.html


PostPosted: Fri Aug 13, 2010 7:15 am    Post subject: Reply with quote

hmmm.... DIY option is aggressive Confused


PostPosted: Fri Aug 13, 2010 7:34 am    Post subject: Reply with quote

I used the DIY option...and it worked surprisingly well...in fact a was amazed how easy it was....

I had three Vivitar 400/5.6 TX lenses our children used....one had a severely bent filter ring from a fall when climbing,bent over about 30 degrees,for a little more then five centimeters of the diameter of the ring.The lens was still used by the kids like this for years.But recently another photographer on POTN was looking for a lens cheap,told him if I could straighten the ring I would send it to him.

I basically used the method in the link ,without cutting the radius in a piece of wood(rather then wood I used several layers of cardboard to cushion the other side of the lens).Instead of a dowel I used a tapered wood plug that I slightly rounded on the end with a file(If you don't have a file,some rough concrete on a sidewalk can be used to round the wood by scraping it on the concrete).Use a piece of softwood like pine or fir rather then a hardwood so the threads are not damaged.

It took about five minutes of tapping back and forth across the bend to return the ring to it's original shape,never tapping in the same place twice in a row.Every few taps or so I would inspect the lens to make sure it was returning to a perfect radius.When done you couldn't tell the filter ring had ever been bent and tested it by screwing a filter,which went on like it was never bent with no damage to the threads.

The key is to take your time and tap lightly on the dowel or whatever wood you use.The hammer I used was a 32 oz. ball bean hammer,so I would have sufficient weight when tapping lightly.

In the link a helper is used to hold the lens.I did it by myself holding the lens down with my forearms while tapping,because my wife wasn't home and my children are adults now and on there own.I would recommend having your son help,he is big and strong enough to do it...and he'll get a big reward by helping his dad.

http://www.kyphoto.com/classics/filterringtool.html


PostPosted: Fri Aug 13, 2010 8:06 am    Post subject: Reply with quote

thanks for the help.... first I have to receive the lens Smile


PostPosted: Fri Aug 13, 2010 8:14 am    Post subject: Reply with quote

Another Nikkor perhaps?

BTW...the soft wood kind of smooshs up and deforms,so needs to be refiled or scraped on a rough surface a couple of times through the procedure to return to a workable rounded shape....in the link he also recommends hardwood,I think this would damage the threads and be mistake.


PostPosted: Fri Aug 13, 2010 8:27 am    Post subject: Reply with quote

24/2.8 ais to be precise Wink

i'll use spruce so I won't damage the thread


http://www.auctiva.com/hostedimages/showimage.aspx?gid=1374115&image=395667676&images=395667587,395667631,395667676,395667723&formats=0,0,0,0&format=0


PostPosted: Fri Aug 13, 2010 8:39 am    Post subject: Reply with quote

Excellent! Your Nikkor collection continues to grow! The bend looks quite minor compared to the large dent I had to fix....perhaps two and a half centimeters at the most.

Last edited by Boomer Depp on Fri Aug 13, 2010 8:48 am; edited 1 time in total


PostPosted: Fri Aug 13, 2010 8:47 am    Post subject: Reply with quote

well I hope I'll fix it without destroying the lens Smile


PostPosted: Fri Aug 13, 2010 8:50 am    Post subject: Reply with quote

Take your time and you'll be fine...


PostPosted: Mon Aug 16, 2010 12:26 am    Post subject: Reply with quote

Boomer Depp wrote:
I used the DIY option...and it worked surprisingly well...in fact a was amazed how easy it was....

I basically used the method in the link ,without cutting the radius in a piece of wood(rather then wood I used several layers of cardboard to cushion the other side of the lens).Instead of a dowel I used a tapered wood plug that I slightly rounded on the end with a file...

It took about five minutes of tapping back and forth across the bend to return the ring to it's original shape,never tapping in the same place twice in a row.Every few taps or so I would inspect the lens to make sure it was returning to a perfect radius.When done you couldn't tell the filter ring had ever been bent and tested it by screwing a filter,which went on like it was never bent with no damage to the threads.

The key is to take your time and tap lightly on the dowel or whatever wood you use.The hammer I used was a 32 oz. ball bean hammer,so I would have sufficient weight when tapping lightly.

In the link a helper is used to hold the lens.I did it by myself holding the lens down with my forearms...
http://www.kyphoto.com/classics/filterringtool.html



I'm with Boomer Depp.

The only differences were: I rested my lens on a piece of solid 1/4" thick rubber matting (placed on a solid bench); I held it in place by chocking it with some folded rags; my hammer was only about two ounces weight; my "drift" or punch was made from a dried Eucalyptus twig found in the garden.

The result was perfect. Very Happy

In my case, the lens tube was probably of relatively soft, anodized (black), Auminium alloy.

Tap softly!