PDA

View Full Version : 1200MM 47 Inch lens!



Pages : [1] 2

goamules
08-22-2013, 09:23 AM
I have acquired a Hermagis Aplanatique that is 1200mm or 47 inch focal length. Other than turning my living room into a camera obscura, what format would this cover, if they even made film larger than 20x24? I'm roughly guessing it would cover 40x40?

E. von Hoegh
08-22-2013, 09:39 AM
I have acquired a Hermagis Aplanatique that is 1200mm or 47 inch focal length. Other than turning my living room into a camera obscura, what format would this cover, if they even made film larger than 20x24? I'm roughly guessing it would cover 40x40?

An Aplanat is basically a Rapid Rectilinear, if that is what this lens is it would cover like most any R-R. NICE find! I'm envious!

Tom1956
08-22-2013, 12:43 PM
Reminds me of a Night Gallery episode with Ross Martin and Rene Auberjonois. For sure, make a camera obscura.

Klainmeister
08-22-2013, 02:19 PM
I'm just glad to OP was inclusive enough to include both measurements in his title. Don't want to confuse us Americans.

E. von Hoegh
08-22-2013, 04:11 PM
I'm just glad to OP was inclusive enough to include both measurements in his title. Don't want to confuse us Americans.

Well, he is wrong. It's 47.2441 inches.

Klainmeister
08-22-2013, 05:00 PM
Whoa, that changes everything!

Dr Croubie
08-22-2013, 05:45 PM
I was watching this (http://www.ebay.com.au/itm/J-H-DALLMEYER-London-5A-5-A-Soft-Focus-Portrait-Brass-Vintage-Petzval-Lens-FS-/251317463162?pt=DE_Foto_Camcorder_Objektive&hash=item3a83b0287a&nma=true&si=1CI2%252F3LW8vCOzHGQ8jTJfSPxMNQ%253D&orig_cvip=true&rt=nc&_trksid=p2047675.l2557) the other day and almost thought that that's the one you'd gotten, except this is smaller than yours (but still, look at the photo with the iphone).
I can't imagine how big a 47" would be, can you lift it?
If the view outside your living room gets boring, you could always make one of these (http://www.cameratruck.net/Site/Landing.html)

Someonenameddavid
08-24-2013, 08:32 AM
I'm still holding out for the Noct Asph f/1.0 version with m4/3 adapter, single coated for my hdr infra red portraits of black cats in coal cellars.

David

goamules
09-20-2013, 09:34 AM
I don't think I'll rent it, but I may sell it outright one day. It would fit on a 9" board.

A couple pics, I dispensed with the usual 35mm film roll, here's a 13" Vitax for scale:

http://farm8.staticflickr.com/7296/9615749697_4f13c2826c_z.jpg

http://farm8.staticflickr.com/7458/9618993052_0399a6820f_c.jpg

ntenny
09-20-2013, 11:18 AM
How in the world do you mount something like that?

-NT

ROL
09-20-2013, 01:09 PM
How in the world do you mount something like that?

-NT

How rude! ;)

desertrat
09-21-2013, 01:07 PM
A lens of that focal length might make a good astronomical telescope objective. A variation of the traditional petzval design is used on some professional grade telescope objectives, and a giant RR might work also.

gleaf
09-22-2013, 07:19 AM
Big Glass envy. Baby Dallmeyer will need a playmate some day. Makes on think of stripping down a golf cart and making a self propelled field camera. Maybe a used circus tent panted black for the bellows.

Dr Croubie
09-24-2013, 06:44 PM
Big Glass envy. Baby Dallmeyer will need a playmate some day. Makes on think of stripping down a golf cart and making a self propelled field camera. Maybe a used circus tent panted black for the bellows.

If it's worth doing, it's worth overdoing. How about an old U-haul trailer, mount the paper on the front end and the lens sticking out the back end. Have a tray of chemicals lying on the floor of the trailer. When the exposure's up, just flick a lever from the outside to tip the paper into the chems, drive down the road for a few minutes to provide the agitations, and you're done.

j-dogg
10-03-2013, 09:18 PM
If it's worth doing, it's worth overdoing. How about an old U-haul trailer, mount the paper on the front end and the lens sticking out the back end. Have a tray of chemicals lying on the floor of the trailer. When the exposure's up, just flick a lever from the outside to tip the paper into the chems, drive down the road for a few minutes to provide the agitations, and you're done.

48' shipping container with a camera obscura on one side and roll-on emulsion on the other, same fixing method, slap it on the back of a Norfolk Southern container trailer to agitate it, and you're done. :laugh:

goamules
10-14-2013, 09:32 AM
Thanks for all the great ideas! I like telescope best, but don't know how to make one. I assume the little viewer lens pieces do something to make the image focus on your eye. Or perhaps I'll do a giant paper negative, I do have some large paper. Don't know how to coat paper myself to make my own. And I wouldn't want to make a 40x47" wetplate....right now.

E. von Hoegh
10-15-2013, 11:37 AM
Thanks for all the great ideas! I like telescope best, but don't know how to make one. I assume the little viewer lens pieces do something to make the image focus on your eye. Or perhaps I'll do a giant paper negative, I do have some large paper. Don't know how to coat paper myself to make my own. And I wouldn't want to make a 40x47" wetplate....right now.

Simple as dirt. Place a 5x achromatic loupe at the focal point of the lens and you'll have a 23.5x telescope. Use a 10x (1") loupe and you'll get 47x, the focal length of the eypeice lens divided into the objective lens give you the magnification. Of course, you also have two doublets with focal lengths of 96" or so....:)

goamules
10-21-2013, 02:15 PM
Brilliant! I was just playing with an old optical device I have, with "AO" engraved on it. It has two levers to focus, and I figured it was an American Optical telescope ocular. But I wasn't sure. So I duct taped it onto a big cardboard packing tube, and held it up to the lens. Pointing out the front door, I could see bugs crawling on the fence post up the street! Thanks, I'm going to make this a little more workable with some PVC pipe.....!

E. von Hoegh
10-21-2013, 03:34 PM
Take it out and point it at the Pleiades, and Jupiter, and... :)
http://earthsky.org/clusters-nebulae-galaxies/pleiades-star-cluster-enjoys-worldwide-renown

MDR
10-28-2013, 01:22 PM
Play paparazzi built an adaptor and focussing mount and use it on your 35mm cam. Or sell hq paparazzi 4x5 negs :)