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what is this 19mm F1.7?
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PostPosted: Sun Mar 16, 2008 2:38 pm    Post subject: what is this 19mm F1.7? Reply with quote
Hello everyone,

I have collected some rarely seen Chinese lenses. Some I know their applications such as 35mm cine primes and zooms, but some I never figured out their usage. Here is an example of a 19mm F1.7 super wideangle that was made for macro use. It has an image circle of about 25mm, and a back focusing distance of about 30mm from the rear element to film plane. Now it has a M47 screw mount, but I think it could be re-mounted for 35mm cine cameras.

So if anyone has seen a similar lens before, and know what it is. Please let me know.

Thanks in advance for yor help.Smile I will post an image later.



Kievuser


PostPosted: Sun Mar 16, 2008 2:40 pm    Post subject: Reply with quote
Chinese lenses ?! Shocked


PostPosted: Sun Mar 16, 2008 2:47 pm    Post subject: Reply with quote
Attila wrote:
Chinese lenses ?! Shocked


Yes, a fast super wide. Very Happy


PostPosted: Sun Mar 16, 2008 2:49 pm    Post subject: Reply with quote
Unbelievable ! I am so curious !


PostPosted: Sun Mar 16, 2008 2:59 pm    Post subject: Reply with quote
http://s76.photobucket.com/albums/j31/zxk_tiger/?action=view&current=DSCN2705.jpg

Sorry, I don't know how to attach photos. See if the link works. Wink


PostPosted: Sun Mar 16, 2008 3:02 pm    Post subject: Reply with quote
If it was made for macro use, does not cover a 44mm circle and has a shallow back focus, then it is not a superwide. It sounds like a bellows lens for high magnification macro use.

Olympus, for example, made a 20mm f/2.0 macro lens for the OM system. It had the standard OM bayonet but was made to be used only on bellows or extension tubes for magnification ratios on the order of 4:1 up to 13:1. At its maximum magnification, the lens' angle of view on 35mm film was only 9 degrees ..... about the same as a 250mm telephoto at infinity.


PostPosted: Sun Mar 16, 2008 3:12 pm    Post subject: Reply with quote
rick_oleson wrote:
If it was made for macro use, does not cover a 44mm circle and has a shallow back focus, then it is not a superwide. It sounds like a bellows lens for high magnification macro use.

Olympus, for example, made a 20mm f/2.0 macro lens for the OM system. It had the standard OM bayonet but was made to be used only on bellows or extension tubes for magnification ratios on the order of 4:1 up to 13:1. At its maximum magnification, the lens' angle of view on 35mm film was only 9 degrees ..... about the same as a 250mm telephoto at infinity.


Thanks! Very Happy That is correct. not a super wideangle. It could be used as a wideangle for 35mm cine cameras. IIRC, Zeiss made some fast cine primes in 13mm-18mm focul lengthes.


PostPosted: Sun Mar 16, 2008 6:10 pm    Post subject: Reply with quote
kievuser wrote:
rick_oleson wrote:
If it was made for macro use, does not cover a 44mm circle and has a shallow back focus, then it is not a superwide. It sounds like a bellows lens for high magnification macro use.

Olympus, for example, made a 20mm f/2.0 macro lens for the OM system. It had the standard OM bayonet but was made to be used only on bellows or extension tubes for magnification ratios on the order of 4:1 up to 13:1. At its maximum magnification, the lens' angle of view on 35mm film was only 9 degrees ..... about the same as a 250mm telephoto at infinity.


Thanks! Very Happy That is correct. not a super wideangle. It could be used as a wideangle for 35mm cine cameras. IIRC, Zeiss made some fast cine primes in 13mm-18mm focul lengthes.

Note that 35mm movie frames are about the size of an APS-C image sensor as used in most DSLRs, so maybe with an adapter some of these fast wide primes could be used without vignetting on a DSLR... Heck, you could even go crazy and try some lenses that are FASTER than f/1, which only seem to be made for cinema and video purposes...


PostPosted: Sun Mar 16, 2008 7:27 pm    Post subject: Reply with quote
It looks kind of like a movie lens. Perhaps there were some Soviet/Chinese movie cameras that used that kind of mount...


PostPosted: Mon Mar 17, 2008 12:14 am    Post subject: Re: what is this 19mm F1.7? Reply with quote
kievuser wrote:
Here is an example of a 19mm F1.7 super wideangle that was made for macro use. It has an image circle of about 25mm, and a back focusing distance of about 30mm from the rear element to film plane. Now it has a M47 screw mount, but I think it could be re-mounted for 35mm cine cameras.


To me, it looks like a cine lens. You could ask user zhang xk on Rangefinderforum.com. He is a collector of Chinese photographic and cinematographic equipment and has a very broad knowledge of Chinese made gear. The site has been down over the week-end because they are doing some software upgrade, but it should be back soon.

Edit: Rangefinderforum.com website is back online.

Cheers!

Abbazz


PostPosted: Mon Mar 17, 2008 2:05 pm    Post subject: Re: what is this 19mm F1.7? Reply with quote
Abbazz wrote:
kievuser wrote:
Here is an example of a 19mm F1.7 super wideangle that was made for macro use. It has an image circle of about 25mm, and a back focusing distance of about 30mm from the rear element to film plane. Now it has a M47 screw mount, but I think it could be re-mounted for 35mm cine cameras.


To me, it looks like a cine lens. You could ask user zhang xk on Rangefinderforum.com. He is a collector of Chinese photographic and cinematographic equipment and has a very broad knowledge of Chinese made gear. The site has been down over the week-end because they are doing some software upgrade, but it should be back soon.

Edit: Rangefinderforum.com website is back online.

Cheers!

Abbazz


Hi Abazz,

Thanks. Very Happy I am the guy with a broad, but limited knowleadge about Chinese optics. Laughing
I talked to an old employee of Beijing Nr.608 factory today. He told me that those Chinese 35mm cine optics were up to those famous brands such as Zeiss, Cooke, and others at the time for IQ. They did some bland testes with these lenses, and some people picked the negatives shot with Great Wall lenses. Smile It is a pity that few factories still make lenses now.

Cheers,

Zhang XK


PostPosted: Mon Mar 17, 2008 2:09 pm    Post subject: Reply with quote
Seymore wrote:
kievuser wrote:
Sorry, I don't know how to attach photos. See if the link works. Wink

FYI... see the IMG code on the right side of the photobucket page? Copy and insert this into your post.

Code:
[IMG]http://i76.photobucket.com/albums/j31/zxk_tiger/DSCN2705.jpg[/IMG]



Also, if you reply to this specific post, you can see the coding used...


Thanks. I will try nest time.
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