Canon LTM Canon 28mm LTM Lens Shade

[aoresteen]

Two years ago I researched and bought a Canon 28mm f/3.5 LTM and I use it on my Leica M4-P.

https://www.rangefinderforum.com/forums/showthread.php?t=153738

I like using a yellow filter so I bought a 34mm Heliopan Yellow 8 for it. I also picked up a generic wide angle lens shade for it. The shade vignettes in the corners.

Here's the one I have:

I took some test shots with/without the filter & shade:

The first row of negatives is without a filter or lens shade.
The second row of negatives is with a filter but no shade
The third row is with a filter and the shade.

The lens was focused to infinity. From left to right the apertures are f/22, f/16, f/11, and f/8.

The shade is the culprit.

I don't mind use the lens without a filter or shade as it's well recessed but with a filter on I want a shade to help stop reflections off the filter. I can't find any wider shades.

Any ideas for getting a shade on this lens?

Thanks!

 

[davhill]

Two years ago I researched and bought a Canon 28mm f/3.5 LTM and I use it on my Leica M4-P. I like using a yellow filter so I bought a 34mm Heliopan Yellow 8 for it. I also picked up a generic wide angle lens shade for it. The shade vignettes in the corners. The shade is the culprit.

I don't mind use the lens without a filter or shade as it's well recessed but with a filter on I want a shade to help stop reflections off the filter. I can't find any wider shades.

Any ideas for getting a shade on this lens?

Thanks!

The cone angle of the shade isn't likely to be the culprit. Its the doubled-extension of filter ring plus shade-mount-ring that's impinging on your view. Try a step-up ring and a larger diameter shade. Step up rings are usually very low profile, and there's less chance the filter+stepup ring will vignette, and this will give sightline clearance to mount a shade.

If the filter+stepup (without shade) doesn't vignette, but filter+stepup+shade STILL vignettes, you need a still larger step to handle the angle of view. Or move the stepup next the lens, and get larger filter & shade.

 

[aoresteen]

The cone angle of the shade isn't likely to be the culprit. Its the doubled-extension of filter ring plus shade-mount-ring that's impinging on your view. Try a step-up ring and a larger diameter shade. Step up rings are usually very low profile, and there's less chance the filter+stepup ring will vignette, and this will give sightline clearance to mount a shade.

If the filter+stepup (without shade) doesn't vignette, but filter+stepup+shade STILL vignettes, you need a still larger step to handle the angle of view. Or move the stepup next the lens, and get larger filter & shade.

Thanks! As I wrote the post I thought of that and ordered a 34-37mm up ring and a 37mm WA vented shade. I'm fearful that it will block the viewfinder.

If that's doesn't work I guess I'll have to have SK Grimes design a rectangular clamp-on shade with the corner cut out like the Leica 28mm shade.

I need to run another test with just the shade on the 28mm and see how it does.

I can't believe that after 66 years we are still trying to engineer a proper shade for this lens.

 

[johannielscom]

Learn to shoot the camera one-handed, wear a hat, and use it to shade the lens when you shoot the camera.

Problem solved

 

[davhill]

Ok then - you’re on the right path . In looking deeper, I find myself reading an old thread from some years ago when -you- were researching this very lens, and the point is made that Canon never supplied a shade for it — presumably for exactly the reasons you’re finding: it’s already deeply recessed, and a shade simply gets in your view. And you lose the benefit of it being such an elegant and tiny lens by mounting a shade. But needs be. I expect the vented shade will serve.

Your 28/3.5 looks like it’s the Serenar version, is that right? Are you pleased by its performance?

 

[aoresteen]

Ok then - you’re on the right path . In looking deeper, I find myself reading an old thread from some years ago when -you- were researching this very lens, and the point is made that Canon never supplied a shade for it — presumably for exactly the reasons you’re finding: it’s already deeply recessed, and a shade simply gets in your view. And you lose the benefit of it being such an elegant and tiny lens by mounting a shade. But needs be. I expect the vented shade will serve.

Your 28/3.5 looks like it’s the Serenar version, is that right? Are you pleased by its performance?

Yes it's a Serenar (type 2 from 1952) and I am very pleased with it. While the lens is recessed that only works when you do not have a filter on. With a filter the glass is exposed and that's why it needs a shade. I would guess that 90% of the time I use a yellow filter.

I will get it sorted out. For now I'm using it without the shade and I make sure the sun is behind me.

 

[rfaspen]

Oh yes. That is a lens I have and use every now and then, and the OP shows the exact very shade I use on it too.

So yeah. If I use a filter with a "deep" or "thick" profile, I get vignetting. It's helpful to know that without the hood, I still get a predictable low-contrast image.

If folks manage excellent results from this lens with careful consideration of its "history", I think that's great!

 

[aoresteen]

.....Its the doubled-extension of filter ring plus shade-mount-ring that's impinging on your view. ....

OK I did test the lens with only the shade on it and you are right - it's the thickens of the Heliopan filter ring that pushes the shade into the frame. Here are some frames with the shade but with out the filter. Left to right f/22, f/16, f/11, & f/8 - lens was focused to infinity:

I'm thinking of having SK Grimes modding the shade so that it slips over the lens barrel and passes by the filter ring, sitting closer to the lens. A set-screw would hold it in place.

 

[davhill]

OK I did test the lens with only the shade on it and you are right - it's the thickness of the Heliopan filter ring that pushes the shade into the frame.
I'm thinking of having SK Grimes modding the shade so that it slips over the lens barrel and passes by the filter ring, sitting closer to the lens. A set-screw would hold it in place.

.. or even a tight friction-fit, as SK Grimes does with their custom lens caps. SKG is 10 miles down the road from me. I could drop by and supervise, hahah

 

[aoresteen]

Davhill, thanks for the offer !

The 34-37mm step ring is in as are two different style 37mm shades to test. Just need nice weather now that Christmas is over.