round Leitz hoods with rectangular fronts, howto DIY?

So here are the 4 compact hoods i've done so far, compared to each other.

As you can see, the aperture is a factor. Wider lenses with smaller apertures actually can have smaller hoods that narrower lenses with wider apertures.

I won't be offering the 21 and 25 until i've got my own copies here to test the mounting system as i don't want to offer something that doesn't even attach.
 

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Cris, also the hood for the c-sonnar has the exact same bayonet as the 21/2.8, both 46mm, might be the same as the 28 Biogon, I guess having the same hood for these wouldn't work out as they've got pretty different coverages, but i's good to keep it in mind.

you're addressing a pretty good gap on the rangefinder niche!
 
Sounds like it might be the same bayonet then

and no, you'd never make a 21/28/50 hood, but it's easier to get the mounting point for 3 lenses right once, than 3 different mounting points for 3 lenses. I'd model the mount once then develop the 3 hoods separately.

Once again, if i can get hold of the lenses, then i can model something up no problem 🙂
 
Okay, so i've gone back over the thread to see what requests and suggestions have been made for lenses. I've had to guess the fitment types for some of these.

Bayonet
Screw Thread
[P] Push over existing mini hood


Lenses Covered Already

Voigtlander
21/4Color Skopar [P]
25/4 Color Skopar [P]
35/1.4 Nokton
40/1.4 Nokton

Zeiss
50/2 Planar


Lenses requested/Suggested

Zeiss
21/2.8 Biogon
25/2.8 Biogon
28/2.8 Biogon
35/2 Biogon
35/2.8 C Biogon
50/1.5 C Sonnar

Leica
40 Cron
35 Cron V3
35 Lux V1
50/1.5 Summarit

Voigtlander
35/2.5 [P]

Hassleblad
60 Distagon CT

Looking at the list, i will probably focus on the bayonet lenses first as they're by far the easiest system. But as i don't have any of these lenses, i'll need to get hold of them for testing one way or another really.
 
Okay, i've finally thought of a way to use a sacrificial filter for the screw thread hoods, yet still be able to screw another filter on top.

I can make a very small, cheap "stopper" for the sake of fitting the filter correctly, that then is removed, exposing the filter thread.

Should only add a dollar or two so onto the price and i'll make it so that you only need one per filter size. I'll update when i've done a test design for this system.
 
Here is a nice article from Paul van Walree about lens hoods. It contains graphics that explain some of the tradeoffs with the design of lens hoods. At the bottom of the page there is cached document from Hasselblad.com where Erland Pettersson describes an elegant way to check for lens hood vignetting without wasting film.
 
Hey there Sol, i did indeed check that out in my research, and was part of the reason i went the direction i did 🙂

"Both the tulip hood and the rectangular hood are more effective than the round hood. Not only because they are longer, but also because their shape is matched to the pyramidal cone and leaves no holes. A rectangular hood reduced to the same length as the round hood in figure 9 would still be more effective."
 
CrisR said:
K43: I could indeed, i don't know if it's the same bayonet, i know that the hood for the Planar does not fit on the 28 Biogon, the Biogon uses a 46mm filter instead of a 43mm and so it's larger. It maybe the same fit as that?

A hood for the 40 cron shouldn't be a problem. For those without any real mounting points, it's probably a case of sacrificing a filter, but then you'd not be able to screw another in front of it, you'd have to screw it behind, and that would change the hood geometry or necessitate making it larger.

I'm kinda doing the easy hoods first lol - but i'm sure i can produce something for most lenses 🙂

Mr Flibble: Likewise, if i have a lens i can work off, i can probably make a nice hood for it.
Click to expand...


The Sonnar-C has a 46mm thread indeed. I'd give you mine to measure the bayonet but I'm not in the UK and I do not trust the parcel services, bad enough I have to use them when buying things.

The Cron-C 40's original hood holds series 5.5 filters. Using the original hood's metal core as a push on holder would be perfect (maybe even glue the new hood on it). There are also Cron-C-to-39mm screw in adapters on ebay, maybe just fit the hood to hold on them?
 
K43, thanks for the offer - i totally know what you mean with regards shipping valuable items around! I'm sure i'll work out a way to get my hands on some in London 🙂

I'll check out the adapter, but i'm a little wary about using cheap adapters as i know the tolerances on them can be pretty poor sometimes. I'll see what it's like. Cheers!
 
Looking at the similarity between the Summarit and Xenon, I think it's likely a screw-in hood for one would also fit the other. The XOONS clamp-on hood fits both as well I believe.
 
Cris, I am really anxious to see your mounting solution for the CV 21/4. Your compact hood design is exactly what i'm looking for. When available I would order one right away.
Or... If you need a beta tester...
Thanks for all of the effort!
 
Hey there Nick!

The testers for all 4 untested hoods will be arriving in 3 or 4 days, i'll be testing them immediately. If and when they pass, i'll be taking photos, updating the store listings and putting them live.

I will probably also do a series of videos that explain each of the hood's use, mounting and anything not obvious. Hoods like that for the 21mm will need a little explanation of assembly, as will any that are screw thread.

I'll also be testing out some hood cap designs next too as it seems people like caps (i don't use them myself)

Cheers!
 
Hi Cris,
Got my hood for the Nokton 40 today and have to say it looks promising.
Hard to believe its a print... good material, good surface, good fit.

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I will do some testing this week regarding vignetting, but have no doubt to find nothing, as it is computed for the 35.

Cris, again, nice work, thanks for the effort... the Skopar 25/4 hood is the next in line, if ready. 🙂

Best,
-haempe
 

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Fantastic! It looks even better quality than the one I had made up - mine arrive later ths week but by all means let me know!

Thanks for bravely jumping in before I'd been able to confirm, I'm really glad to hear you're pleased with the result so far 🙂
 
This thread rules! Maybe I missed it but I'm surprised nobody has asked about a hood for the 50mm Leitz Summarit f/1.5. Those hoods are super-rare and expensive. The hood used a thumb screw arrangement. Wish I still had my copies.
 
Hello, so the hoods arrived and we have good news.

The Planar 50/2 hood is tested and all a-ok. http://www.shapeways.com/model/764153/zm_50_2_planar_compact_hood.html

The VC 35/1.4 and 40/1.4 hood has been tested and is also a-ok http://www.shapeways.com/model/764151/vc_35_1_4_or_40_1_4_compact_hood__untested_atm_.html

I will get these both updated with photos soon.

I found that one of the prints was a little tighter than the others i've had done with the bayonet. It needed the grooves cleaning out a bit more, but then fit fine. The fit is very tight, on purpose, but if you all feel it's too tight, i can make it wider in the future.


The 21mm and 24mm hoods both arrived too, and the pop-on fitment i designed has worked perfectly, no need for glue at all.

They're both perfect on my M8, but i think there maybe some vignetting on full frame. However is it hard to tell, as F4 doesn't let in much light and so using my system with the M2 isn't as clear as i'd like it.

So, is there someone with an M9 in the UK and the CV 21 and 25 lenses that i could post these to for a 2nd opinion? Ideally in London, but i know that might be pushing it.

If they are vignetting, it's only by a tiny amount and would just be a case of shortening the hood length by a couple of mm.
 
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