Dropped my Lens (Page 2): It's why I use a lens hood.

Basil Loc: New Mexico

rgrenaderphoto wrote:

Another perfect illustration of why I use a Filter 101.

It's why I use a lens hood.

SierraP Loc: Eastern Sierras

Look around various sites/ dealers. I remember thread restoring tools for a nominal price. I had the same problem and restored the threads with a block of wood cut to the proper inside diameter an used it to restore the proper curvature.

carl hervol Loc: jacksonville florida

Take a pear of pliers on the filter ring and twist it the filter ring will come off and not hurt the lens.

crazydaddio Loc: Toronto Ontario Canada

jerryc41 wrote:

If you want to remove what's left of the filter, carefully make a couple of cuts into the filter ring with a hack saw. That will release the tension and make removal easier. When you see what the lens looks like, you can think about getting it repaired.

I'm not sure what you mean by testing for DoF.

http://www.dofmaster.com/dofjs.html
http://www.cambridgeincolour.com/tutorials/dof-calculator.htm

...basically, more of an aperature check using DOF check ie the quality of the background blur under specific conditions.... Like a graduated test chart at 45deg where you see where the blur starts and that will confirm you are at 1.4 aperature...something like that...

Trying to find out how to validate the lens is actually getting to 1.4 when i set it there
I can MAYBE test exposure at 2.8 against my 70-200 at 2.8 and see if the light transmits but DxOmark would say different lenses have different T values at the same aperature so that wont work....hence the DOF test

...is any of this making sense :-)

crazydaddio Loc: Toronto Ontario Canada

Thanks to all who responded. I think I will keep using it until I feel I need to go ND filter route for high sun and 1.4 aperature. Until then, will risk the lens without the UV protector...

(..and I use the lens hood 100% of the time for protection as many have noted. I dropped it while putting it away... Had the lens cap on and the hood reversed and screwed on too...klutz move)

crazydaddio Loc: Toronto Ontario Canada

Thanks to all who responded. I think I will keep using it until I feel I need to go ND filter route for high sun and 1.4 aperature. Until then, will risk the lens without the UV protector...

(..and I use the lens hood 100% of the time for protection as many have noted. I dropped it while putting it away... Had the lens cap on and the hood reversed and screwed on too...klutz move)

Haydon

If you value that piece of glass, I would send it back for inspection and repair unless of course the cost is astronomical. You do not want a lingering wondering. Everytime you use that lens without the inspection you will have doubts otherwise.

nervous2 Loc: Provo, Utah

Haydon wrote:

If you value that piece of glass, I would send it back for inspection and repair unless of course the cost is astronomical. You do not want a lingering wondering. Everytime you use that lens without the inspection you will have doubts otherwise.

I have to agree with Haydon. Just take a deep breath, wrap and package carefully and send it in for inspection and/or repair. Best of luck.

old poet

I had a stuck filter ring due to a drop of my Nikon 70-200 on hardwood. Filter wrench was not strong enough. I used a Dremel flat cutting circular blade, carefully sawed two square notches on opposite sides of the UV ring then used a thin square screwdriver edge as a lever. A little pressure released the dented filter ring. No apparent harm after several shoots. Cutting the ring away risks cutting into the threads of the lens. The notchest on top of the ring prevents that, but risks too much torque if the lens filter ring is bent too much.

jcboy3

crazydaddio wrote:

Dropped my Sigma 50mm 1,4 ART lens on the concrete recently. Shattered the UV filter and dented the filter mount.
Took if for a test drive today and appears to be still in working order (still AFs and appears to be centered.)
Question: How do you test/calibrate for DOF at 1.4 ? ...other than sending back to Sigma for checkup?
Here is a pic. 1/250, F1.4, iso100 with LR edits (sharpen etc)

Shoot a brick wall with a tripod. You want to be perpendicular to the wall; I tape a mirror to the wall and line up the camera so the reflection is looking back on the lens. Then check for uniformity in the corners.

crazydaddio Loc: Toronto Ontario Canada

jcboy3 wrote:

Shoot a brick wall with a tripod. You want to be perpendicular to the wall; I tape a mirror to the wall and line up the camera so the reflection is looking back on the lens. Then check for uniformity in the corners.

Hmmm. Interesting.
What is the purpose of the mirror...other than to double the focal distance thus blurring the wall.
...or does that help with a uniformoty check as you can check for "relative" blur but not when everything is sharp. I can see how this can help with checking for a decentered lens but how would it help me to know whether the aperature is fully at f1.4?

(Assume you meant to focus on the camera in the mirror).

jcboy3

crazydaddio wrote:

Hmmm. Interesting.
What is the purpose of the mirror...other than to double the focal distance thus blurring the wall.
...or does that help with a uniformoty check as you can check for "relative" blur but not when everything is sharp. I can see how this can help with checking for a decentered lens but how would it help me to know whether the aperature is fully at f1.4?

(Assume you meant to focus on the camera in the mirror).

The mirror is to ensure that the lens is perpendicular to the wall. If you see the reflection of the lens in the mirror when looking through the viewfinder, then you are perpendicular to the mirror. If the mirror is taped to the wall, then you are perpendicular to the wall. And thus the wall is parallel with the focal plane. If there is any decentering of the lens, it will be apparent: corners will not be uniform in focus.

Shel B

Nikon mount? Some great buys on ebay for older Nikon lenses...and they are great. Probably cheaper than sending your lens back for repair. A little advice that was given to me by Professor Nielsen on the first day of Photo 101: You think it's a strap but it's really an insurance policy.