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Pentacon Helioplan & Agfa Colostar 95/5.6 (enlarging len
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PostPosted: Mon Oct 30, 2023 5:28 pm    Post subject: Pentacon Helioplan & Agfa Colostar 95/5.6 (enlarging len Reply with quote
I've stumbled upon two seemingly quite unusual enlarging lenses recently on two different occasions:

- a Agfa Colostar N 95/5.6 (with Prism)
- a Pentacon Helioplan P2 95/5.6

Both seem to be enlarging-type/industrial lenses and they obviously share the same specs, a focal length of 95 mm, maximum aperture of 5.6 and a pretty round aperture shape.

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I wasn't able to find anything on these two lenses online and have no idea, if the same specs might point to a similar application they were used in or are just a complete coincidence.

The Colorstar seems to be a typical 5-3 Reverse-Heliar construction and the Helioplan is most likely a 4-4 Dialyt (similar to the older Meyer Helioplan enlarging lenses), at least from my initial observations.

Has anyone here ever seen one of these lenses or does have any idea which device they might have been used in? They both look quite unusual and the Agfa lens seems to have been custom made (as the M.XXXX number suggests, from our research on Agfa lenses) and likely modified further for the application. I was able to find a hint at a similar Pentacon (P3) lens with a slightly longer focal length, so it could have been part of a family of lenses...

Last edited by simple.joy on Tue Oct 31, 2023 5:55 pm; edited 1 time in total


PostPosted: Mon Oct 30, 2023 11:37 pm    Post subject: Re: Pentacon Helioplan & Agfa Colostar 95/5.6 (enlarging Reply with quote
Interesting lenses that I have never seen before. Good find Like 1


PostPosted: Tue Oct 31, 2023 5:06 pm    Post subject: Reply with quote
Interesting finds - thanks! What other Pentacon Helioplans are there? And what aperture does this 95/5.6 stop down to?


PostPosted: Tue Oct 31, 2023 6:03 pm    Post subject: Reply with quote
16:9 wrote:
Interesting finds - thanks! What other Pentacon Helioplans are there? And what aperture does this 95/5.6 stop down to?


Pentacon Helioplan 105/5.6
https://flic.kr/p/aEmyeN

(Owned by the one who helped us out with one of the Noritsu lenses)

The Pentacon Helioplans seem to lack any aperture markings. I assume it stops down to f/11 or f/16 but haven‘t compared it.
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