round Leitz hoods with rectangular fronts, howto DIY?

CrisR - would you be willing to share the files for this? I've got access to a few 3D printers and would be interested in playing around with this myself (and would of course welcome anyone in the LA area to join me)
 
Okay!

So for those of you with a pioneer spirit and fancy checking out one of these hoods for yourself, i've put up 4 hoods that you can order 3D printed on demand (as in, they don't go through me)

The hoods are:

The one photographed above, for the 35/40 and ZM 50, which i've tested
A version of the same hood, but with a cutout for the VF
The VC 35/40 hood i posted earlier, but haven't tested yet
The ZM 50 hood i also posted and haven't tested.

I've put a warning on the listings - they're tested in so much as they will all definitely mount properly, and all should be fine on the M8 or NEX crop sensors, but as i've not tested them with a full frame, if you want to buy one before i do, then please be warned! If it doubt, wait til mine have turned up and been tried out :)

I've spent a lot of hours on researching and modeling these now and plan to produce designs for other lenses too, mainly the CV wides, so i'm not planning on open sourcing the files, but you're welcome to have a go at designing your own based on what i've done here of course.

If anyone does order one, feel free to feedback!

http://www.shapeways.com/shops/AnalogueRobot
 
Hi there pdh,

i was just mentioning the style, but i'm sure one could be developed easily enough. The only reason i'm doing these first is because i actually have the lenses to work from - i don't have a 35 Cron, so it's hard to develop for it.

However, now i have my spreadsheet sorted, i'm sure i could alter an existing hood to do the job properly. I'd still need to check out the lens tho.
 
Thanks for responding. I'll keep an eye on this thread for developments.

And well done for catching a niche need and finding a way to fill it!
 
Cris these look fantastic! Am I right in thinking the one for the 35 Nokton will also be suitable for the Zeiss 35 f2 and 35 C Biogon f2.8 as they both share the same bayonet mount as the Nokton?
 
Nigel Meaby said:
Cris these look fantastic! Am I right in thinking the one for the 35 Nokton will also be suitable for the Zeiss 35 f2 and 35 C Biogon f2.8 as they both share the same bayonet mount as the Nokton?
Click to expand...

I didn't realise it was the same fitment

The 35mm f2 and f2.8 should be fine, but if anything, the one for the Nokton will be oversized.

My calculations show that for f2 aperture, the hood can be smaller and for 2.8, smaller again.

I've just had a look, and the 50/f2 hood is almost the right size for the 35/2.8. It wouldn't be a 10% safety margin, it'd be closer to 6%, but it might work. I'd need to test it to be sure.

On an M8, i'd say the 50/2 hood would be fine on the 35/2.8, but again, until i've been able to get my hands on these and fully test them, it's faith in the numbers :)

I will be testing every single hood, the ones that are currently untested are just for those brave souls who wish to take a punt and join in the fun!

My next test, will be for 21mm and 25mm hoods for the CV lenses, mainly to test mounting them on the existing mini screw in hood via friction and a very accurate print.
 
I ordered one of the new / untested 35mm/f1.4 hoods last night. I know its still experimental but I'm excited about it! Worst case, I'll sell it here to someone using a cropped sensor body and pick up a future iteration of the design.

I'm really excited about this!
 
Very cool project. I love seeing stuff like this. As a mechanical engineer / CAD specialist, this is right up my alley :)

Great work!
 
Awesome Brian!

Feel free to message me when it arrives with any findings and feedback, or problems of course

Thanks Patrick!
 
Okay, so here is the Voigtlander 21mm f4 Color Skopar hood that i've been working on.

Because it has no Bayonet, it's not quite so easy to mount it properly aligned, if at all.

The only way i can see to fit it, is to mount it over the top of the existing mini-hood that screws in.

What i've done, is to model the barrel (sans screw-thread) and the mini hood separately, then worked from the base of the mini hood. The replacement hood has a hole for it that is ever so slightly (0.1mm) smaller than the mini hood. This should offer a super tight friction fit.

The hole to insert the mini hood, has a stopper inside it, so that a set length of the hood (6mm) goes in, but leaves a little sticking out. This is as much to offer a little extra finger clearance for the aperture tabs (not modeled)

So what i'd do, is screw the metal mini hood on, then twist the new hood on top of it, making sure it's aligned.

What i could do, is put a tiny mark at the top and bottom of the hood, so you can line it up with the white mark on the aperture ring that identifies the current selection.

If the friction fit wasn't strong enough, what you'd be able to do, is line up the top mark, then mark the mini-hood using the bottom mark. Then, when you unscrew the mini-hood, you can fit it inside the replacement, align the mark, and put the tiniest bit of superglue on at that point, taking care not to get it on the screw thread. The glue will be sucked into the gap by capillary action (i do this every day with my own work prototypes) and wipe off any excess.

I'll have images of the CV 25 f4 Color Skopar soon too :) That hood's even smaller.

I won't be putting this up on the store until i've tested that it mounts this way.
 

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My high tech way of checking lens hoods don't foul full frame images
 

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Thanks Setyotomo!

I think i need to find someone here in London that would be okay lending me a 35 cron V3 - once to measure it all up, then again a couple of weeks later to test it out. It should be pretty similar to the 35/1.4 one, just a little smaller again?

I'm just not sure about attaching it securely to the barrel without marking it in any way.
 
Would like something for my freshly-acquired Xenon. The problem is back in the day it had some kind of clamp-on barn-door hood (rarer then rocking horse droppings and hen's teeth). Heck, original lens caps are $80 ;)
 
CrisR: Could you make the hood for a 50mm f/1.5 C-Sonnar? Is the bayonet the same size?

I'd also love a square hood for the C-cron 40mm (maybe using the original rubber hood's metal threaded ring?)
 
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.
 
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