Help: infinity focus with 9x12 Unknown beauty

[gimenosaiz]

you can grind the frosted side again, with silicon carbide powder, 600 grid. https://www.youtube.com/watch?v=hxC48_sd6BM

Hi!
Thank you !

Regards

A ground glass is not forever! You can always replace it with a modern one!

Hello!

Thanks, I think I'll start looking for it ;-)

Regards

[gimenosaiz]

Hello!

I think that the lens has issues.
Look at the pictures: halos, lack of contrast and, blurry edges and corners and a strange swirly bokeh.
These images reminds me of the first photographs I shot with my Primoplan. It had been dismounted and wrongly mounted!

1.

2.
IBSOR_Fom100_HC110h_037_197 by Antonio Test, en Flickr

3. Swirly bokeh ???
IBSOR_Fom100_HC110h_037_200 by Antonio Test, en Flickr

4. I'm not sure what this artifacts are these:
IBSOR_Fom100_HC110h_037_199 by Antonio Test, en Flickr

What do you think??
Thank you!
Cheers

[gimenosaiz]

Hello!

I've dismounted the lens and I've seen that the shim that helps to support the front element was wrongly placed before that element!! This also seemed to force the second element to be mounted upside down. I think I've mounted it correctly now because I think I can focus at infitnity extending the bellows around 137mm !!!
It's close night in Spain, I'll check it tomorrow ;-)

Thanks!
Antonio

[Nodda Duma]

Well done!

-Jason

[Cor]

There are people out there who will love the wrongly mounted lens for its weird effects...;-)...(I am not one of them though, the novelty/weird factor wears quickly for me)

enjoy the camera and lens !

best,

Cor

[Pere Casals]

I like those wild swirls !

Perhaps the lens should be left like it was

The swirls point that with the inverted element the entrance pupil (or the exit one, or both) would be limitating aperture when diafragm open enough.

[gimenosaiz]

Well done!

-Jason

Thank you!

I hope it is really ok now ;-)

cheers
Antonio

[gimenosaiz]

There are people out there who will love the wrongly mounted lens for its weird effects...;-)...(I am not one of them though, the novelty/weird factor wears quickly for me)

enjoy the camera and lens !

best,

Cor

Hi!
Jajajaja ... yes, you are right but I'm fine with the AeroEktar and my little Primoplan ;-)

Regards
Antonio

[gimenosaiz]

I like those wild swirls !

Perhaps the lens should be left like it was

The swirls point that with the inverted element the entrance pupil (or the exit one, or both) would be limitating aperture when diafragm open enough.

Hi!

I also like swirls ... but I've enough swirly lenses ;

Thank you
Regards
Antonio

[gimenosaiz]

Hello!

It seems that the lens is now ok :-)

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My father volunteered for this test

Thank you for your help!!!!!

Un abrazo,
Antonio