Vega11y - test for IR.

[Ninjin]

I noticed that my lens Vega11 (Вега11 2.8 50) has a very small focus shift in IR. It still has a shift, but it's very small.

 

This allows me to make a fragment of a photo of a text (book) or other very small object, and combine the IR photo and + the visible photo, almost exactly. If there is such a task.

 

I put the lens in the adapter as for infinity for the Nikon camera, and I removed the lens for infinity.

 

So I'll leave this post, maybe someone needs a tool like this one. This is a very cheap option and can be used.

Perhaps someone has already written about this lens, I did not look.

There are many variants of Vega, but I've only tried this one lens. There is no thread for the filter, I fixed the filter with tape.

On tests:

Left - IR 830, right - visible. There is no focus change during shooting.

 

 

I don’t know - all such lenses work this way or only mine lens.

 

 

 

 

(It doesn't work in UV.)

[Stefano]

Nice concept. Does refocusing change the magnification of the image? In other words, will this still work using a lens with a bigger focus shift, refocusing the lens?

[Cadmium]

Ninjin, Nice lens!

 

Stefano, It is an enlarger lens, so no focus in the setup above, except moving the camera, looks like?

[Stefano]

Yes, my question was about doing the same with a lens with a bigger focus shift, refocusing every time. If by doing that the magnification of the image changes, you can not make a composition, as the sides will not match. Does that happen? If it does the only way of doing what Ninjin did is by using a lens like her (if you keep everything still).

[Ninjin]

Thank. Yes, this lens has no focus.

 

If I understand correctly - if the same exact connection of photos of small macro fragments is possible, if just use refocusing, on other lens, even if this other lens has a larger focal shift.

 

Yes, it is possible. I suppose yes? It depends on how much to spend for post-processing and free time. And will need popcorn, or maybe even .. Depends on the temperament.

[Andy Perrin]

Definitely popcorn, with my temperament. Stefano, the magnification would change, because you are moving the lens relative to the sensor. It could be accounted for in post-processing using something like Hugin to align the images, but it's obviously better just to not have the focal shift in the first place.

 

A good find, Ninjin! I use the EL-Nikkor 80mm/5.6 metal which also does not seem to have too much shift for that kind of thing. I'm presently working on a project to extract watermarks from old documents and this may be useful.