How many filter-rings make a lenshood?

[Sean Moran]

Hello folks,

Now I have a Summaron 35mm with goggles (thanks Onno), the next consideration is a lenshood. With the 50mm, I use two Leitz filter rings, screwed together and painted matt-black on the inside, for a lenshood. Would this be too many for the 35mm? I also have one of those Chinese '50mm Summicron' lenshoods. Would that cause vignetting?

Obviously I'll be experimenting with this lens before I use it for anything important, but I just wondered if fellow Summicron/Summaron/Elmar/Summilux 35 users had been down this road before. Suggestions gratefully received.

Cheers,

Seán.
(Belfast)

 

[richard_l]

The screw-in B+W rubber hood I sometimes use with my goggled f/2.8 Summaron is a straight cylinder for about 7 mm before it starts flaring out. I doesn't vignette, so a couple of stacked filter rings should work okay. Actually the front element of the Summaron is recessed so deeply that it shouldn't normally even need a hood.

 

[ywenz]

Actually the front element of the Summaron is recessed so deeply that it shouldn't normally even need a hood.

That is, until you drop the lens and the point of impact is on the lens instead of the filter...

 

[richard_l]

That is, until you drop the lens and the point of impact is on the lens instead of the filter...

The front lens element of the Summaron is recessed at least 1 cm into the barrel, and it is not much more than 1 cm in diameter. A filter would be an unrecessed glass element right at the end of the barrel (flare-bait) and would provide little if any additional impact protection.

 

[FPjohn]

hello:

Congratulations on your Summaron. The element is somewhat recessed and not as in need of a hood as some lenses. Standard 50mm hoods, such as the 12585, and your double ring will work.

yours
Frank

 

[ywenz]

The front lens element of the Summaron is recessed at least 1 cm into the barrel, and it is not much more than 1 cm in diameter. A filter would be an unrecessed glass element right at the end of the barrel (flare-bait) and would provide little if any additional impact protection.

This guy's making a hood with filter rings.. thus the glass element would be removed from the filter. I don't know about you, but I'd much rather having the point of impact on the filter ring and having that force be spread out evenly...

 

[Sean Moran]

That's right ywenz.

Thanks for your helpful replies, folks.

Here in Belfast flare is not often an issue (although we have had some lovely days lately with a low Autumn [US:Fall] sun creating long shadows around Queen's university). However, a Christmas trip to Delhi and Agra (Taj Mahal) will need good flare-protection hence my question - which you guys have answered admirably. I'll try some empirical experiments over the weekend and report back to you.

Best wishes,

Seán.

 

[raid]

I often use several step-up rings to make my optimal lens hood for a given lens. There is someone on bee-bay regularly selling 8 or so step-up rings together for a good price.