I have a Meopta Anaret f4.5 80mm lens (it has a roughly 23mm thread mount)
There is a very high likelihood that that lens has a 25mm thread mount.
This is what an LPL lens mount looks like - essentially a threaded cup.
View attachment 332470
I don't know if that greatly complicates other people's suggestions.
And yes, if it is 23.5mm, what were they thinking?!!!
It won't need to be a cup at 80mm. It would need to be a cup at 50.
For normal operation, the LPL is set up so the "cup" is oriented one way - with the "bump" down/out - with an 75, 80 or 90mm lens and oriented the other way - with the "bump" up/in - with a 50mm or shorter lens.
Matt, I'm just trying to establish for the poor guy that he doesn't need to run out and buy a 3d printer or order some kind of adapter when a piece of cardboard and some masking tape will get his school project done.
@inthedark. Following this site:
your lens would have a 23.5 mm thread (what did they think??).
Assuming your LPL enlarger has a 39mm standard hole/thread, you need a 23.5 --> 39 adapter. Contact this guy, who delivers good quality for very reasonable price. Explain to him precisely what you need; is the hole on the enlarger side threaded or plain? do you also need a 39mm retaining nut?
If the LPL is 39mm it is probably easier and as cheap to find a fitting lens rather than to buy or manufacture an adapter- unless you follow Don’s advice- which is perfectly sound.
Thank you for the reply. I think 3D printing or cobbling together a custom mount will be the best option for me.
What I'm trying to indicate is that the "poor guy" may have to use something that works and looks like the purpose made LPL lens mount - perhaps by attaching your cardboard and masking tape to an existing LPL mount with a larger hole!
Thank you for the reply.Welcome to Photrio, @inthedark_06 !
In addition to Matt's suggestion: you could indeed 3D print a lens board. I've done this for a couple of lenses on my Durst enlarger, and the approach works. The nice thing with materials like PETg and PLA is that they're pretty soft. Hence, if you print a circular aperture of an appropriate diameter, you can simply screw/force the lens into this and it'll sort of thread itself in there without damaging the thread on the lens. Of course, you won't be able to infinitely unscrew and screw back the lens into the board, as the board will wear down. But if you just print a dedicated board for this lens and enlarger, you could just leave the board on the lens and use it that way. Printing a legitimate thread for multiple use is pretty much a non-starter given the resolution and in particular tolerances of a typical consumer-grade 3D printer.
What I did for my Durst boards was simply use an existing lens board as a template, recreate it in Fusion 360, but with a circular opening of an appropriate diameter. Works very nicely. When sizing the opening, err to the side of making it smaller so you can enlarge it a bit if the lens doesn't fit. If the hole is too small, the screw mount will get stuck halfway through and the lens won't be aligned properly. Take some sandpaper or a round file to the hole and give it another go.
It's not going to win any beauty contests, but it'll get the job done alright.
My photography teacher (who basically owns the darkroom- she's the only one who teaches it at the school I go to) gets a bit weird about letting me go in there and tinkering with the enlarger, but I'll work it out.
This is what an LPL lens mount looks like - essentially a threaded cup.
I don't know if that greatly complicates other people's suggestions.
And yes, if it is 23.5mm, what were they thinking?!!!
The LPL enlarger has, where the lens mount fits, a round receptacle with three set screws - each 120 degrees away from each other.I am not sure whether the hole for the lens board on the enlarger has a thread,
I assume you need the 80mm to enlarge 645 or 6x6. Is that unusual in that darkroom? She doesn't have an enlarging lens for medium format?
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