It appears that a heavy fog warning in in order for my 70-300
What a great lens my Tamron 70-300 has been in the past. It was put away for a few months in what I thought was a good dry place, when I unpacked it I noticed that it had foggy images-maybe like mildew might have collected on one of the elements. What is it going to cost me to fix it, and can it be fixed? The lens is probably about ten years old.
Re: it appears that a heavy fog warning in in order for...
If you have fungus in the lens there isn't much you can do. If you have moisture in the lens there is a little trick that I've used that has worked well for me. Extend the zoom all the way out on the lens, then use a hair dryer to blow air into the lens at the base of the extended zoom. Don't blow directly on the lens optics. When you are cleaning your lenses do not blow on them. That is a major contributor to moisture in a lens.
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Well, that's a great lens and most definitely worth the cleaning/service. I don't know where in the world you are but fungus growing inside a lens is only heard of in high humidity environments and can happen fairly quickly. Are you sure this is a fungus on the inside and not just a clouded smear on the front element? If the lens is having a problem then the camera won't be to far behind. To answer your question more directly "what should I do" my suggestion is to send the lens to a authorized Tamron service/repair center/depot for cleaning. After which get a few of those little moisture absorbing packets and place them in with your photo gear to help reduce the moisture.
not a lot the lens is a big heavy lump to hang on the camera mine do the same thing,,,best bet is use shorter lenses not just one big cannon hanging off the frount that can zoom in on a fly at 1000 yds
Try gently cleaning the electronic contacts on the lens's mount with an eraser. This will remove any mild oxidation on the contacts. If this doesn't resolve the problem, then contact Tamron and ask if there are any issues using this particular lens with a Canon 40D.
Contact Tamron USA via their web site or a phone call to get a price quote for the front lens assembly. However, I would strongly suggest that instead you allow Tamron to repair your lens since more than likely the internal roller glides have been compressed due to the impact. This would allow the front lens group to wobble a bit while focusing and zooming, and this would seriously affect the image quality.
I have faced similar problems previously with my Canon 20d and Sigma 170-500. Its even more annoying to see it happen in field while it would be okay back home. I was told that it is electronic compatibility problem instead of complaining the best was to change the lens and hence bought a 100-400 and happy ending.
Autofocus function on the D40 only supports lenses with the
AF-S feature, which have an autofocus motor built into the lens,
instead of using an autofocus motor drive built into the camera.
The Tamron lens you have, does not have a built in motor and
the autofocus function relies on the motor drive in the camera.
It will not work with the D40 or D60, but it will work with other
Nikon digital SLRs, such as the D80. Need to get an AF-S
type lens or upgrade to different Nikon digital SLR. Unless
you do this, you will have to manually focus the Tamron lens.
All of the Nikon DX (for digital) series lenses are also AF-S
type, so they will work with the D40, which is designed as
an entry level digital SLR, therefore it is intended primarily
for use with DX lenses, which are typically sold in a kit with
the D40. Most common one is Nikkor 18-55mm DX AF-S.
Other Nikon AF-S lenses made for film cameras (FX type)
will also work with the D40, but these tend to be expensive
professional models. DX series lenses tend to be more
affordable. You might consider the 18-200mm DX AF-S
as an alternative to the Tamron, but these are not cheap.