lens shade for smaller CCD

[okram]

I wonder why this question never occured (or I did not look good):
When using (lets say) 21 mm lens one uses its lens shade, but a viewfinder for 28.
Shouldnt you use shade for 28?

Marko

[carstenw]

There has been some discussion of this here and there. Some shades fit, others don't. Some people use shades, others don't (like myself).

[Woody Campbell]

You can basically use the vented metal hood that was designed for the 35 and 50 on any lens that it will fit on. I've tried it on a 21 super angulon - without any adverse effect on vignetting.

[jaapv]

I use the ZI Biogon 28 hood on my Biogon 21, and an ancient Leica 50 mm hood on my Summicron 35 asph.

[harmsr]

I use the hood from my 35 Lux ASPH on the 28 Cron ASPH, due to the smaller size.

No vignetting. Actual FOV is 37mm on the 28 when on the M8, so no issues.

Ray

[okram]

Thank you people,
Im buying a biogon 21 and wanted to know wich shade to order.
The 28 shade looks much smaller and will take less of the viewfinder.

Dont you think that companies should mention or offer something?
I sometimes use my 16-35L on Ds and 30D, and on 30D it (shade)makes allmost no sense...except ptotecting the lens.


M

[Olof]

Originally Posted by okram

I wonder why this question never occured (or I did not look good):
When using (lets say) 21 mm lens one uses its lens shade, but a viewfinder for 28.
Shouldnt you use shade for 28?

Marko

Why, the 21mm lens is still a 21mm lens even the picture looks like a 28mm lens because auf the crop factor.

[jaapv]

Originally Posted by Olof

Why, the 21mm lens is still a 21mm lens even the picture looks like a 28mm lens because auf the crop factor.

But the vignetting induced by the "too small" shade is cut out by the smaller sensor, giving you the chance to reduce the skew and stray light much more without negative effects and increasing quality. It is not about focal length but about field of view.

[Eoin]

Originally Posted by okram

I sometimes use my 16-35L on Ds and 30D, and on 30D it (shade)makes allmost no sense...except ptotecting the lens.
M

While this may be possible to shoot without the hoods you always run the risk of flare or lower contrast, while with SLR's it's more likely that you'll be aware of this when viewing through the viewfinder but not so with the rangefinder. It's good practice to shoot with the hoods so as to lessen the risk of nasty surprises when you get home or have the a film developed.

[Peter Branch]

In professional practice, and certainly in the movie industry, it is not unusual to use a bellows lens hood which is adjusted to allow for the lens focal length and also for the lens extension, i.e. subject distance, and the working aperture. Every bit of stray light is prevented from entering the lens.

If a smaller image sensor, CCD or film, is used than a hood designed for a longer focal length is likely to be more appropriate.