Vivitar lens

Algernon
Posted 29/05/2013 - 14:23 Link
That's pretty bad If the tanning salon doesn't
work strip it down and clean it with Ponds Cold Creme
leave it on for about an hour.

'
Half Man... Half Pentax ... Half Cucumber

Pentax K-1 + K-5 and some other stuff

Algi
fatspider
Posted 29/05/2013 - 17:50 Link
Algernon wrote:
That's pretty bad If the tanning salon doesn't
work strip it down and clean it with Ponds Cold Creme
leave it on for about an hour.

'
Wont that make the lens Soft?

My Names Alan, and I'm a lensaholic.
My PPG link
My Flckr link
Frogherder
Posted 08/06/2013 - 23:50 Link
Viv is back from her holiday on a sunbed and I can't see the slightest improvement.

So I think the next tack is to get her stripped and rubbed over with cold cream

I'll keep you posted on progress

regards
Bernard
Frogherder
Posted 09/06/2013 - 16:44 Link
I am surprised at how easy it was to get at the front lens (the whole front section unscrews then a tiny grub screw releases another ring)

Any way I used Algi's cold cream remedy and I now have a crystal clear lens to play with, see :-

Comment Image
.

The dust is on the outside of the lens (I know Ishould have cleaned that off prior to snapping the lens)

regards
Bernard
Algernon
Posted 09/06/2013 - 17:01 Link
That looks great It's surprising how easy some lens
front elements are to work on. I don't think you'll have
any more problems with that one.
Half Man... Half Pentax ... Half Cucumber

Pentax K-1 + K-5 and some other stuff

Algi
Frogherder
Posted 10/06/2013 - 13:19 Link
Bit of a dull day in the garden but I think the lens is working OK (at least to my satisfaction)

Comment Image


K10D in manual mode ISO 200; f2.0 - green button came up with 1/1500.
Original was a tad dark so lightened just a bit in PS7

regards
Bernard
Algernon
Posted 10/06/2013 - 13:25 Link
Nothing wrong with that...
Half Man... Half Pentax ... Half Cucumber

Pentax K-1 + K-5 and some other stuff

Algi
Frogherder
Posted 10/06/2013 - 14:10 Link
Be even better in about a month - ie plus crumble


regards
Bernard
Algernon
Posted 10/06/2013 - 16:27 Link
As Spike Milligan once said " It's only the hair on a
Gooseberry that stops it from being a Grape!"
Half Man... Half Pentax ... Half Cucumber

Pentax K-1 + K-5 and some other stuff

Algi
RayB
Posted 12/06/2013 - 01:49 Link
stevejcoe wrote:
Hi Bernard, it is a well known issue with some of the old Vivitars. The extended shield is the problem of Pentax DSLRs. It is quite a simple fix.
1. Remove the small screws that hold the shield in place and carefully lift the shield away.
2. Cut or grind down the shield depending upon whether it is plastic or metal. Use a modern Pentax lens to gauge how much to cut away.
3. Make sure there are no rough edges and clean down well , before refitting to the lens.

Regards - Steve
That is major modification from where I'm sat

I've got a 70-210mm Macro lens and have the same issue, I did post about it some years ago.

Would my local camera shop undertake a modification? Alternatively, if anyone wants the lens, I'll discuss a swap/part ex etc.
Frogherder
Posted 12/06/2013 - 10:48 Link
I suppose it could be classed as major surgery but quite easy if taken steadily.

I first turned a wooden mandrel onto which the loose ring would slide firmly.

A stepped shoulder stopped the ring at the required distance.

I then cut around with a fine hacksaw blade (the end of the wood preventing too much straying from the line)

Finally finished with a fine flat needle file (again using the end of the mandrell as a guide)

A quick bit of fettling on all cut edges to remove burrs etc then washed off any debris with plain water.


Probably a bit long winded to some but the result is in my 2nd pic.

I then dabbed some black acrylic paint over the cut edge (pic #2 taken before this stage)

regards
Bernard
RayB
Posted 17/06/2013 - 21:07 Link
I've done something different - found a 52mm reversing ring in the box, so I've reverse mounted the 70-210mm onto the K5.

When I've got some results, I'll post them

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