If you can go back away in the forum you should find that mowag not only cleansed a lens for me but put on the forum pictures showing the proceedure
This should give you a very clear idea of how to go about cleaning fungus.
I miss Mowag. He was so helpful.

Opinions are opinions based on knowledge and perception.
When the opinion is different from our own, it becomes us to accept the integrity of that opinion.
We draw our opinions from an open mind and then hold or change them as we see fit.
I refuse to purchase photo magazines simply because, in my opinion, the magazine staff cannot be free from pressures to appease their main advertisers. I do not blame them because it is commercial necessity and their livelyhood is at stake. Without advertising revenue there would be no magazine
The compromise they make is to alienate many potential readers who use products whose manufacturers do not support their magazine through heavy advertisments.
One has only to read their reviews of pentax products and compare these with reviews on Forums to draw a negative conclusion. Making that point is valid.
I doubt that there is a single Forum member who would claim Jessops as the Premier Retailer. You really do have to wonder just why this magazine should chance its reputation by making such a claim.

Noticed that Practical Photography has voted Jessops as best retailer of the year 2010. I quote.
"Winning our best retailer award for the 15th year running is no mean feat, so its testament to the fact that Jessops' combination of face to face and online retailing is just what the consumer desires. And it's a well deserved win" !!!!!!
No! I did not buy the magazine or any of the others

Stefan never bored me. Not seen him since Christmas. Where is he???

The critical issue with 645 to pk is enabling infinity. The adapter for the mamiya cost £75 plus and with the 500mm mamiya lens infinity was doubtful. Using a 150mmm mamyia reached good results.
The 645 pentax to pk can be bought from the internet. There has always been a Canon version available. I had a lengthy correspondence with the seller and persuaded them that a Pentax 645 to pk version would be welcome. This is now available. The distance from camera to lens is critical to achieve infinity. I have not tested this out yet. Using the 1.7 adapter can be cumbersome. It does require some aditioinal support for the lens. I have purchased an adapter intended for video work and this does the job.
It is an interesting route to go and can be expensive but fun.

As a follow up. The 645 pentax MF lens is the Ed If F4 and is manual focus. I have tried the pentax 1.7 adapter that should in theory turn this into auto focus but it would take a better photographer that I am to get tnis to produce satisfactory results.
This lens is hefty in comparison to the Pentax 300mm and does take a lot of handling to get sharp results. The mamiya 500 lens is even heftier but is is fun to try these things.

I have been using both pentax and mamiya 300mm and 500mm medium format lens on the K5 with an adapter. I am pleased with the results.
The pentax adapters are very expensive. I have bullied the far east adapter concerns to produce a similar adapter for Pentax. This is what I am using. I think it cost under £40.
Those who know these things tell me that the colours are very good but soft.
I now have the Pentax 300mm lens. When the weather changes will do a side by side test and maybe post the results.

As a decrepid oldie with a pronounced limp, I can easily be stereotyped as something I am not. Putting a camera to my eye can evoke some interesting reactions.
I have had two similar situations. My response has been to hold up my hand and say 'just wait a minute until I switch to video mode and then you had better be sure you are can back up your issue with my camera.'
It had a sobering effect that led to a sensible conversation where I was able to explain what I was actually doing.

I have just received a call from a member of the 'cash back' team to reassure me that I will receive my £120 some time next week stating that they now have the 'receipt'
As all they have is what I sent in November I can only speculate why the delay and phone calls.
John. I do not agree that being paid is the main thing. Clearly from my experience a staff member at the cash back office do not know a receipt when they see one.
SRS tells me that what they sent to me is no different from any other receipt that would be tendered as support for the cash back offer.
Someone has had my cash back money for the last nine weeks. It leaves a sour taste in my mouth that Pentax can treat their customers in this manner.

John. They received my claims form with the written receipt showing SRS Vat number for a purchase in November.
They phoned me stating that this was not a Vat receipt. They required a Vat receipt to comply with the Cash back offer.
I contacted SRS who commented that they had issued many written receipts without there being a problem.
I sent further copies showing clearly the Vat number, which obviously they knew anyhow from the many claims so far via SRS.
I received another call this morning stating that they had not received the further copies and needed to do so to comply with the 31rst January deadline.
SRS came to my rescue by phoning Pentax UK. They have phoned me to say that Pentax has authorised the refund.
I am interersted if I am the only one who has been dealt with in this way and to head up any further problems by members.
Doesn't it make you wonder if this is all a delaying tactic in effecting the refund.
Pentax should take this seriously and set in place a simpler Cash Back system if they wish to retain customer confidence.