The Le Fave Super Kabahlucida XLP 300mm/f2 Lens

[dominicLF]

Some said that it couldn't be done. Others ran in terror. Still others held out secret hope. The wait is over!

My first experiments with The Le Fave Super Kabahlucida XLP 300mm/f2 Lens for the Bessa L are now posted in the Super Kabahlucida Gallery. You can view this at: http://www.dominic.lefave.net/SKLgallery1.htm

Full information on the lens itself is at: http://www.dominic.lefave.net/SKL.htm

 

[Kin Lau]

Very neat... but at the risk of provoking the RF gods, why didn't you use an SLR instead? That would have solved scale focusing problem.

 

[dominicLF]

Very neat... but at the risk of provoking the RF gods, why didn't you use an SLR instead? That would have solved scale focusing problem.

Brilliant! Why didn't I think of that? 😀

Then again, I can't believe you even suggested that here! :angel:

 

[jorisbens]

Beauttiful photographs!!! 🙂 They really have the glow 😀 I'm getting jealous about that lens, Ihave a weakness for fast tele-lenses 😛 And congratulations on the marvelous results.

Joris Bens 😎

 

[chug]

Cool photos 🙂 Fitting an SLR on there would be interesting.. as well as a nice big vented hood maybe? Cant wait to see more photos 🙂

 

[dominicLF]

Super Kabahlucida, Pentax SV, Angle Finder

Super Kabahlucida, Pentax SV, Angle Finder

OK, OK, I'm working with my Pentax SV now. 😎 Why do you say a VENTED hood? I have to say, I never understood what vents are supposed to do in a hood.

 

[chug]

I have no idea why hoods are vented either.. But I didnt want to offend anyone if I didnt mention vented hoods 😉 Would be nice if someone could say why some hoods are vented and others not tho! 🙂

 

[ScottS]

I have no idea why hoods are vented either.. But I didnt want to offend anyone if I didnt mention vented hoods 😉 Would be nice if someone could say why some hoods are vented and others not tho! 🙂

One reason is that, for RFs at least, some hoods would block too much of the VF/RF without the vents. Certainly the Canon 50/1.2 hood would block quite a bit without the vents. This wouldn't matter for SLRs, of course.

I'm not sure if there are any other reasons for the vents.

Scott

 

[chug]

Ahh.. Good point! Cheers 🙂

 

[bmattock]

One reason is that, for RFs at least, some hoods would block too much of the VF/RF without the vents. Certainly the Canon 50/1.2 hood would block quite a bit without the vents. This wouldn't matter for SLRs, of course.

I'm not sure if there are any other reasons for the vents.

Scott

Hi-speed get-aways. Turbo viewfinders help too, of course.

Best Regards,

Bill "Our Lady of Blessed Accelleration, Don't Fail Me Now" Mattocks

 

[Oldprof]

If ever a lens called for an SLR, this one is it! 😀

Regardless, congratulations on your imagination and construction skills. 😛

 

[johne]

Perhaps hoods are vented to trap and maintain the concentration of GAS. Just a thought. Johne

 

[dominicLF]

Somebody stop me!

Somebody stop me!

I just picked out an aluminum bunt pan which I will quickly modify to become a lens hood. It is the perfect size and shape. I just need to paint it black. This lens is already fast enough, so I am not going to cut any speed vents in it. I need something to slow this baby down, woah. Somebody stop me!

 

[Theo-Prof]

An empty one-gallon paint can with the bottom cut out would look pretty impressive as a lens hood.

Kevin

 

[dominicLF]

An empty one-gallon paint can with the bottom cut out would look pretty impressive as a lens hood.

Kevin

Really, you should see the bunt pan. It is really perfect. It is nearly ready so pics will be up soon.

My big project now is to create an iris, or apreture plates.

 

[BJ Bignell]

Any plans to build an aperture into this? With or without an aperture, might be an interesting lens to use in the city, late at night...

 

[Socke]

Ok, that's a realy MAD (tm) project!

I think I'll have another look on the video beamer lenses 🙂

 

[wlewisiii]

Semi-seriously, have you considered making a set of waterhouse stops for this monster? It would be interesting to see it's performance then... 😀

William

 

[dominicLF]

Waterhouse Stop

Waterhouse Stop

Semi-seriously, have you considered making a set of waterhouse stops for this monster? It would be interesting to see it's performance then... 😀

William

Hey, William. What exactly is a "Waterhouse Stop"??

 

[wlewisiii]

From Photonotes.org:
Waterhouse stops.

A system of interchangeable fixed-size aperture plates.

In the mid to late 1800s camera lenses did not have adjustable iris-type aperture diaphragms as they do today. Instead they either were used wide open or else employed a system of interchangeable black metal plates. These plates, which were inserted into a slot on the side of the lens barrel, had holes drilled into them. The photographer would adjust the lens aperture by swapping out one plate for another with a different size of hole. These plates were named Waterhouse stops, apparently after the inventor who came up with the system in 1853 or 1858 or thereabouts.

William