12mm CV Heliar,J Milich adapter,LR,UV/IR filter

[fjmcsu]

Thought I would post a few pictures that were taken quickly today before sundown having just received my 77mm UV/IR filter for the 77mm filter adapter I have for the CV12.The 9cm adapter fromJ Milich works well & is coded for WATE.Pictures taken as follows:
1-lens detection on ,+UV/IR . filter on ,16mm
2-lens detection on ,+UV/IR , no filter ,16mm
3-lens detection on ,(-)UV/IR ,no filter, 16mm
4-lens detection off, no filter,16mm
I didn't use a tripod(wish I had but in a rush & I used expodisc WB from the day prior & it was little cooler(more cloudy) today so WB is off slightly.Next time I will do one at the shoot but dusk was rapidly approaching.
No adjustments all as shot(including exposure ;one spot removed,yes there are many!)), used LR except for sharpening in PSCS3.
The lens does quite well! as to the filters etc.be my guest!

[bradreiman]

looks like a winning combination sir. nice greens, fantastic field of view, obviously reminds me of the 15 on the old m6. nice golf course too. thanks...b

[bradreiman]

the first looks like the truest colors-do you agree?

[guy_mancuso]

Interesting the one with filters the grass looks greener and without more yellow but look at the tree on the left it is magenta in color with IR filter on it made it more black and without more magenta or probably normal. I tend to like the filter on and maybe because the green has punch here. Nice test though and just makes me want this lens more

[jlm]

coming soon:
a filter adapter for the 12mm C/V; still on the drawing board, but it looks like the glass from a Leica 49mm may work...same as for the WATE but in a new adapter.

[c6gowin]

Francisco, there seems to be quite a variance in the color of the tree in the lower left corner. Which is most accurate color in your opinion? Also, there appears to be some flare or ghosting/reflection from the filter in the first shot - in the center of the sky.

I have been contemplating this lens for a while and your post is helpful. John's 9cm adapter is great (I have one for my C/V 15) and I am happy to here he has a filter holder in the works. These two add-ons could make this lens even better.

[hsdee]

Francisco, which brand IR filter did you use? I think the 1st picture is the best in terms of color fidelity. I too have a 12mm CV Heliar and used it before 1.12 firmware without coding and with a B+W 486 IR filter. My pictures were severely green on the corners. It's good to see your pictures turn out much better than mine. I've placed an order with JLM for his adapter so I can self-code.

Herb

[haribo]

Okay, speaking as an art director here, I think picture number 3 is the best. The only difference between ## 1 and 3 is that 1 has more punch. Which means the black content is higher. But unfortunatelly not in a controlled way. The grass looks nice, the bush/trees to the left are too dark and lack detail while the sky is way too dirty looking.
That's why I prefer #3. It is easy to punch up just the grass in postif one desires.

[fjmcsu]

Thanks for viewing guys.To answer some questions:Bradley I think the truest colors are from the first picture.Guy, certainly the greens have more punch & are more true to the course although my grass(in the foreground) is more yellow ! Herbert, I uses a B+W 77mm UV/IR filter(none that size available from Leica that I know ).Mark, the color variation in the tree to the left is because of my changing position on that shot compared to the others.I should have used a tripod to keep the position the same but was in a hurry!

[sps]

Don't know if anyone has mentioned it, but the B&W filter for this lens to fit the CV mount (if I recall it was 77mm) comes with a plastic filter cover that becomes lens cover. Very convenient.

For those that do buy this combination, remember that when photographing back-lit subjects, the white lettering on the lens ring will reflect on the back of the filter. I used a sharpie and colored all the lettering black. No more problem.

The other trick is keeping dirt out of the area between the lens & filter (and stray light). The filter adapter has large holes that, by design, are supposed to be on top. I mount the adapter upside down and put some black tape over the holes. Since your not using the rangefinder, the occlusion of view is not an issue.

Good luck with this combination.

[jlm]

still in the prototype stage, but I have determined that the minimum glass to avoid vignetting will be from a 55mm filter. the max OD will be 2-3/4" (70mm) and constitute a small flare prevention "hood." should be done by next week.

jm

[guy_mancuso]

Put me on the list John. I just won one on e-bay just need to pay for it. LOL

[sean_reid]

Originally Posted by jlm

coming soon:
a filter adapter for the 12mm C/V; still on the drawing board, but it looks like the glass from a Leica 49mm may work...same as for the WATE but in a new adapter.

Hi John,

As I mentioned when we spoke yesterday, I think you'll need at least a 55. The 55 I tested still gave some hard vignetting (just barely) but if your filter adapter can get it closer to the front lens element than it might be OK. Otherwise, a 60 will be the way to go. As you know, I've been doing a bunch of tests with the 12 this week.

Cheers,

Sean

[sean_reid]

Originally Posted by jlm

still in the prototype stage, but I have determined that the minimum glass to avoid vignetting will be from a 55mm filter. the max OD will be 2-3/4" (70mm) and constitute a small flare prevention "hood." should be done by next week.

jm

Hi Again,

OK, so you were able to get it close enough to work with a 55, great. How close did you need to get it to the front lens element?

Cheers,

Sean

[kidigital]

Excellent work guys! I'm getting excited ... the CV12 is a must have for the price if you like to go really wide. John, I sent you a PM to see if I can get an adapter.

Kurt

[jlm]

I am holding the glass about 1mm (.040") from the lens surface and see no vignetting in a preliminary test.

does anyone know what the angle of view is for the 12mm and 15mm lenses on a 35mm frame?

I would like to set the interior angle of the flare hood to the "cropped" angle of view for the 12mm on an M8; also for the 15mm, as this may morph into a filter holder for that lens as well (Sean's suggestion)

pretty soon I'll be covering both ends of these babies.

[guy_mancuso]

John a cropped framed or a full frame. i would imagine your looking for the M8 frame. 12mm =18mm which i think is 105 angle of view but need to check this for sure. Need a chart

[guy_mancuso]

I was close 100 degrees

http://www.bdimitrov.de/kmp/technology/fov.html

[guy_mancuso]

I take that all back it is actually 12mm on a M8 1.33 equals 15.6 which equals 108 angle of view

[sean_reid]

Originally Posted by jlm

I am holding the glass about 1mm (.040") from the lens surface and see no vignetting in a preliminary test.

does anyone know what the angle of view is for the 12mm and 15mm lenses on a 35mm frame?

I would like to set the interior angle of the flare hood to the "cropped" angle of view for the 12mm on an M8; also for the 15mm, as this may morph into a filter holder for that lens as well (Sean's suggestion)

pretty soon I'll be covering both ends of these babies.

Absolutely, and I look forward to trying the filter holder/hood adapters for both the 12 and the 15. Just based on my own experience this week, 1 mm in front of the front lens element might get it close enough. Attached is a cyan drift test shot for the 12 at F/5.6 with a B+W 55. Note the hard vignetting in the corners. This is using the 46-55 step-up adapter that we discussed.

BTW, folks (and not to scoop my own review of the ultra-wides) but this example was made *with* the M8 lens detection set to "on + UV/IR" so its abundantly clear that the M8's corrections for a 16 don't begin to correct a 12. It's true that a 55-60 mm Leica filter might show a bit less cyan drift (given this firmware) but the difference wouldn't likely be dramatic.

That's as I expected and had suggested in some of our earlier discussions about this lens. I've been in contact with someone who is working on a software correction for this lens, though. I dub the CV 12 with IR-cut filter the king of cyan drift.

BTW, Guy lent me a 60 mm 486 for this testing (thanks Guy) but I can't seem to find a 46-60 step-up ring so there's no good way to hold it (centered correctly) in front of the lens for testing. But if a 55 is this close, I would think a 60 would do it (or, as I said, a 55 that is very close to the front element).


Cheers,

Sean