Canon Tele-Converter on Nizo

[etimh]

If I use the Canon 1.4x67 C-8 Tele-Converter lens, with a step-up ring, on the Nizo 801m, what telephoto length do I end up with? Can anyone explain the formula for how this is calculated?

The Nizo lens is a 7-80mm and Nyberg says on his site that the 1.4 C-8 Tele-Converter increases the 814XL-S (which is 56mm) to 78.4mm in length. Difference being 22.4. Would I just add this number to the Nizo's 80mm and would the resulting telephoto length be 102.4?

I already put the lens on and it seems okay except for super-vignetting at the wide end (and being very heavy). Has anybody else done this? Did it work out okay for telephoto shots?

Tim

[Alex]

I used mine on my Eumig. It too is has a 56mm telephoto on it and it too goes to approximately 78.4mm as Mr. Nyberg states.

The calculation goes as follows....

56 x 1.4 = 78.4

Or 56 x .4 = 22.4 = 56 = 78.4

So on an 80mm lens you would get an additional 80 x 1.4 = 112. Not too shabby.

Spectra film & video has a Canon 1.6 but I think it is a 52mm ring size so it won't fit on my Eumig which is 55mm ring size. The 1.6 would have been sweet.

I need to check eBay to see if the current line of video doublers might work on a Super-8 camera, assuming one can find one with a bigger lens ring size.

[Alex]

I recently tried one and I was satisfied with the results. I think it cuts down light transmission a bit, don't know how much though.

[etimh]

Thanks Alex. 112mm--yeah, that's pretty cool. Awfully heavy on the front end though! [img]wink.gif[/img]

Tim

[Alex]

I have a 1.4 and think it is useful for "street level" stuff, but for moon shots I need more of a telephoto than 78.

I'll be looking into 2x extenders, maybe even a three times extender as well. Although once I do that a very steady tripod becomes a must.