Looking for infos about Rapid Baryt Aplanat Helios

[TheMissingLink]

Hello all,

since some time I am looking for a suitable lens for wet plate. All are imply so expensive I don't want to feed the lust.

Yesterday I accidently found one no one else wanted to take, for pocket money I couldn't do anything wrong.


In net and my other sources I couldn't find any information about this lens.

Pehaps someone of you has some details like image circle and/or year etc? Experiences? I hope to use it with half plate.

It's a "Helios Rapid Baryt Aplanat f8 260mm"

Sorry pictures until now. If I am lucky I will hold it in one week in my hands.


for every information thankful


horst

 

[MDR]

The lens should cover the halfplate Format with quiet a bit of movement. It is of classic RR/Aplanat construction.

 

[AgX]

But isn't the name quite strange?

 

[macfred]

But isn't the name quite strange?

It is ...

Baryt is a Barium mineral - it is used in the production of optical glass.

 

[AgX]

Baryt means Bariumsulfate (at least nowadays) and I do not know of its use in optical glass.


But yes, Barium is used in optical glass and most probably that is the idea behind that designation.
Thank you for hinting at that.

 

[MDR]

Baryt stands for the glass that was used in this case Baryt Leichtes Flint Glas (Baryt lightflint glass)first made by Schott in 1888 which offered better correction than previous glass used for the construction of Aplanat/Rapid Rectlinear lenses. The glass was also referred to as "Jenaer Glas" The lens you refer to is either a copy or a new name for Waechter's Berlin Leukograph Baryt-Aplanat first made in 1892. For more Information on that lens read the Article in the Photographisches Correspondenz of 1892. Josef Maria Eder the then god of photo chemistry and history wrote a favourable Review of that lens. The article can be viewed online under the following link:
http://anno.onb.ac.at/cgi-content/anno-plus?aid=phc&datum=1892&size=45&pos=636

 

[macfred]

Baryt means Bariumsulfate (at least nowadays) and I do not know of its use in optical glass.


But yes, Barium is used in optical glass and most probably that is the idea behind that designation.
Thank you for hinting at that.

I have to be careful -
Chemistry certainly isn't my forte ...

 

[TheMissingLink]

Good morning,

Thank you all for your comments! At least there's hope to be a bargain and suitable for my needs.

I will update on that topic when I got it the next days, have cleaned and tried it out.

horst