Retaining ring for Rodagon 300mm f/5.6

[3e8]

I purchased a Rodagon 300mm enlarging lens off of ebay recently, and it didn't come with a retaining ring. I contacted HP marketing, who sells the Rodenstock lenses, and they said they sold all their remaining stock of the retaining rings to KEH when they stoped selling the 300mm. So I've called KEH, and they n longer have any of the retaining rings left.

Any thoughts where I can get the retaining ring for this lens? I did a quick search of ebay and couldn't find any.

[Greg Davis]

You may have to bite the bullet and have SK Grimes make one for you. And I think Mike1234 is selling retaining rings of all sorts.

[ic-racer]

Depending on how you are going to mount it, a flange from SK Grimes might not cost much more than just a ring. In fact my 300mm Rodagon came from Durst mounted on a Vapla board using the flange in the back as a retaining ring.

I'm probably going to have them make a 75mm M.9 flange for a 250mm Fujinar that I have.

[Mike1234]

I have a bag full of retaining rings but, unfortunately, I don't have a 90mm. Sorry...

I have a couple of Ilex #4's and #5's plus an Aplhax #4 plus a very large and a HUGE brass TT&H and a plethora of others in many sizes down to tiny/miniscule.

[ic-racer]

I have a bag full of retaining rings

75mm M0.9??

[Mike1234]

75mm M0.9??

I'll Check.

[polyglot]

It's just a really big nut, right? If you can't find one, ring around a few custom engineering joints and they'll probably make you one in 5 minutes out of brass on a lathe - you just need to know the thread measurements. Or hand the lens over and they'll measure and make one.

[Mike1234]

75mm M0.9??

I lent my thread gauges to someone and can't remember who. I've ordered more but it'll be a week before they arrive. That stated... I forgot to search for a 75mm flange last night. I'll pin a note to my shirt so I remember tonight.

[eclarke]

Try KHB Photografix... http://www.khbphotografix.com/ ..Evan Clarke

[Mike1234]

75mm M0.9??

I have a 75.49mm and a 74.28 as measured by the innermost threads. Again, I can't measure the pitch until my new guages arrive.