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Accidentally took apart my CV 28 2.0 II

  
 
Seabassius
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p.1 #1 · p.1 #1 · Accidentally took apart my CV 28 2.0 II


In the ultimate display of dumbassery and demonstration of why I shouldn't have nice things, I somehow separated the two body pieces of the CV28 when I was trying to brute force the lens hood off (btw, it comes off real easy with a little push in and then twist). I was able to re-attach the two body pieces, but it is not quite right because it still extends a little too much when you twist the focus. Still works and pictures seem fine, but I was getting a little glare on street lights as I was playing with it (but this could be normal for all I know.

I imagine getting it back 100% is more costly than buying a new lens, but was curious if anyone knew how to make it go back together so that it was like normal? or do I now have a character lens



Feb 27, 2024 at 08:57 PM
Fred Miranda
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p.1 #2 · p.1 #2 · Accidentally took apart my CV 28 2.0 II


This disassembly article by @yukosteel may provide you with hints on how to correctly reassemble it:

https://www.yukosteel.com/2023/10/disassembly-voigtlander-28mm-f2-ultron.html



Feb 27, 2024 at 09:15 PM
yukosteel
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p.1 #3 · p.1 #3 · Accidentally took apart my CV 28 2.0 II


Yeah, send me the pictures of your lens to [email protected], I'll help you remotely how to put it together.


Feb 27, 2024 at 09:19 PM
Seabassius
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p.1 #4 · p.1 #4 · Accidentally took apart my CV 28 2.0 II


Awesome. Thank you so much. Iíll get pics over to you this morning.


Feb 28, 2024 at 08:51 AM
Seabassius
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p.1 #5 · p.1 #5 · Accidentally took apart my CV 28 2.0 II


Sent email with some pics. Let me know if you need better or more specific location pics. I tried to downsize them so you didn't. have a large email. Hopefully it goes through.

lance



Feb 28, 2024 at 02:46 PM
yukosteel
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p.1 #6 · p.1 #6 · Accidentally took apart my CV 28 2.0 II


Yes the pictures are great, thank you. It's impressive to see that lens is detached in such a clean way without any visible damage to helicoid. Looks like the radial rotation stress only impacted inner pair of brass helicoid guiders. They are made of thick brass plate, but are not indestructible - it's a trade of in a favor of having this lens in impressively compact size.

Good news is that this damage is repairable and lens can be returned to perfect factory-like functional condition. It's not hard to DIY craft brass guider replacements, thankfully their geometry is relatively simple.

On the other side - its useful to discover that CV 28mm F2 requires extra attention when dealing with hood mount area . Some third party lens hoods have very strong springs may require excessive effort to be detached. If hood is stuck, do not rotate it with force - set aperture ring to F16 and focus lens to infinity. Then grab the hood and press it toward lens front first, only then dismount in CCW direction, it should rotate easy that way.



Feb 29, 2024 at 12:27 AM
WCMTWS121
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p.1 #7 · p.1 #7 · Accidentally took apart my CV 28 2.0 II


oh boy make me nervous as iv'e forced my Hoage hood on/off before


Feb 29, 2024 at 11:07 PM
 


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yukosteel
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p.1 #8 · p.1 #8 · Accidentally took apart my CV 28 2.0 II


Yeah, I also have one Haoge hood, and didn't point attention earlier, but now will definitely do! : )


Mar 01, 2024 at 12:35 AM
yukosteel
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p.1 #9 · p.1 #9 · Accidentally took apart my CV 28 2.0 II


UPDATE: lens is successfully repaired, here is a short article with more details and conclusions: https://www.yukosteel.com/2024/03/disassembly-voigtlander-28mm-f2-ultron.html


Mar 03, 2024 at 11:41 PM
Fred Miranda
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p.1 #10 · p.1 #10 · Accidentally took apart my CV 28 2.0 II


yukosteel wrote:
UPDATE: lens is successfully repaired, here is a short article with more details and conclusions: https://www.yukosteel.com/2024/03/disassembly-voigtlander-28mm-f2-ultron.html


I'm amazed by your willingness to assist others purely for the challenge and the high level of creativity involved in the process of repairing and disassembling lenses. You're a great asset to our photography community. Thank you, Yuri!



Mar 03, 2024 at 11:53 PM
Seabassius
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p.1 #11 · p.1 #11 · Accidentally took apart my CV 28 2.0 II


Canít thank you enough. And I agree with your conclusion, very low probability of this occurring. This was 100% user error.


Mar 04, 2024 at 08:23 AM
Fred Miranda
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p.1 #12 · p.1 #12 · Accidentally took apart my CV 28 2.0 II


Seabassius wrote:
Canít thank you enough. And I agree with your conclusion, very low probability of this occurring. This was 100% user error.


Now, you can't part with this lens for sentimental reasons. It went through a lot.



Mar 09, 2024 at 10:32 AM
Seabassius
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p.1 #13 · p.1 #13 · Accidentally took apart my CV 28 2.0 II


What do you mean, I can market it as practically hand built by Yuri himself. This is one I keep for what its went through for sure. Now need to pick up an M10-R when I get some dollars saved up.


Mar 09, 2024 at 03:11 PM







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