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Priming Generic Macro Focusing Helical
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PostPosted: Fri Apr 19, 2019 10:13 pm    Post subject: Priming Generic Macro Focusing Helical Reply with quote

I have several now from many suppliers all are mostly the same - Pixco, fotasy, Fotofox, etc, etc. I don't want to chat about which is best or reaches infiniti. What I would like to know if it makes sense to clean and re-lube the helical with a more stable grease.

There are many locations where the grease runs it looks like machine oil. I worry about storing the macro helical attached to my lenses of off gas, corrosive, splatter or run. Lens is rare and worth 10 times as much.

There are other comments in threads about cleaning off paint and flocking. This should be specific to grease.

Any thoughts would be appreciated.

Thanks


Last edited by Blazer0ne on Sat Apr 20, 2019 4:22 am; edited 1 time in total


PostPosted: Fri Apr 19, 2019 10:41 pm    Post subject: Reply with quote

Don't store them attached to lenses to begin with?


PostPosted: Sat Apr 20, 2019 4:31 am    Post subject: Reply with quote

Gardener wrote:
Don't store them attached to lenses to begin with?


Regular lenses have helicals too...
Rolling Eyes


I have a few situations where I would rather leave them attached because the rear element is exposed or the setup is unique for the lens.

I have a lens in which the m42 adapters wont allow it to reach infiniti. It is probably .5mm too long a thread turn away somewhere inside. Instead of finding that perfect adapter, or taking out on the lens, I can use a macro focus helical that goes over and under the flange by some mm. That allows me to set perfect inf. when needed and extra bonus macro.

Also have them attached permanently makes the lens a usable item than I can grab and go instead of fumbling with adapters and threads.


Friends


PostPosted: Sat Apr 20, 2019 6:43 am    Post subject: Reply with quote

Blazer0ne does have a point there: every chinese helicoid I have required several repeated cleanings after use.
Evaporation is a possibility, I believe.

Yet unless one is planning to store lens with helical attached and unused for very long periods of time, I'm not sure there is a real threat.
After all, the rear lens is easily accessible for cleaning in the majority of cases.

Re-greasing to a proper stable silicon-based lens grease sure would eradicate these concerns.
Depending on one's view on the issue it might look warranted.

Me, personally? I think I'm too lazy for that.


PostPosted: Sat Apr 20, 2019 4:09 pm    Post subject: Reply with quote

In a sense these have become my lens adapters.

You can attach a m42/nex slim adapter to the back of a focus helical which only adds ~1mm to the flange distance. If the measurements are correct it makes a perfect adapter, which can be collapsed when traveling. For example a 17-31mm with slim drop down to ~18mm for storage where as a m42 adapter in general extends ~27mm.

Lenses are stored in a glass cabinet with no caps. In my case Yes I would keep a lens in annex for any period of time before use.

I think what I will do is remove the focusing adapters for the time being. Over time, give them a naptha bath and relube with PTFE/Lithium.

They are pretty simple to take apart anyway I already had some screw come loose in a follow cam which locked it. There is really no loss to do this I guess and I can think of it as insurance.

If you ever spend say 8 hours cleaning a lens you will not want to do anything that would jeopardize its current condition. Unless, it was to capture a kilar photo.




The Kilar 90/3.5 and the 300/4 pictured above require a focus helical. One was a visioflex m39 which I think actually was originally optioned with a second focus gear, so I made one. The 300/4 had an Arri Std which I removed to expose a m39 and have assigned a focus helical for this to make a non nonsense adapter with easy trim.

Wink


PostPosted: Sat Apr 20, 2019 4:57 pm    Post subject: Reply with quote

Blazer0ne wrote:
Over time, give them a naptha bath and relube with PTFE/Lithium.

One thing to note: the "usual" flavour of PTFE grease (non-transparent milky-white) gives way much resistance to my liking.
If you use helicoid just as collapsible adapter, I guess that's a positive, but if you plan to actually focus with one, I recommend getting the specialized flavour made for lens helicals.


PostPosted: Sat Apr 20, 2019 6:35 pm    Post subject: Reply with quote

aidaho wrote:
Blazer0ne wrote:
Over time, give them a naptha bath and relube with PTFE/Lithium.

One thing to note: the "usual" flavour of PTFE grease (non-transparent milky-white) gives way much resistance to my liking.
If you use helicoid just as collapsible adapter, I guess that's a positive, but if you plan to actually focus with one, I recommend getting the specialized flavour made for lens helicals.


Honestly, I wasnt' sure if it was a design issue that rubs off the oil or the oil itself. So... Anyway...

I could absolutely go with something specific. I was initially thinking a 50mm lens equiv. maybe 10 or 30 weight lens helical grease.

I am open to suggestions. What brand or weight anyone would recommend for my use case? Grease is +30$ ea, first hand experience only, please.



Thank You Dog


PostPosted: Sun Apr 21, 2019 12:02 pm    Post subject: Re: Priming Generic Macro Focusing Helical Reply with quote

Blazer0ne wrote:
I have several now from many suppliers all are mostly the same - Pixco, fotasy, Fotofox, etc, etc. I don't want to chat about which is best or reaches infiniti. What I would like to know if it makes sense to clean and re-lube the helical with a more stable grease.

There are many locations where the grease runs it looks like machine oil. I worry about storing the macro helical attached to my lenses of off gas, corrosive, splatter or run. Lens is rare and worth 10 times as much.

There are other comments in threads about cleaning off paint and flocking. This should be specific to grease.

Any thoughts would be appreciated.

Thanks

I've never had any issues with the initial lubes on any of my half dozen budget Chinese helicoids. Maybe it's down to ambient conditions, things don't get too warm here Smile in hotter conditions the viscosity will be reduced so splatter or run might be a possiblity. I think it's most unlikely off gassing will occur from any such lubricant at habitable temperatures.

The lubricants will be less volatile than aluminium rolling oils which don't start to boil till well over 200°C - so they don't 'outgas' till you heat them over 100°C.

They are even less likely to be corrosive.

WRT infinity focus that's very dependent on the lens, one of those I use with a helicoid is recessed so the rear of the lens comes out of the back of the helicoid (and indeed the slimline adapter that's mounted on). Other lenses require shorter helicoids (I now have one that starts at 10mm) or multiple extension tubes added to the helicoid to make the system usable.


PostPosted: Sun Apr 21, 2019 12:44 pm    Post subject: Reply with quote

Blazer0ne wrote:

I am open to suggestions. What brand or weight anyone would recommend for my use case? Grease is +30$ ea, first hand experience only, please.

My stuff was bought somewhere from China, and the description is in Chinese, don't know how the specific mix is called.


PostPosted: Thu Apr 25, 2019 7:13 pm    Post subject: Reply with quote

Thanks for the feedback!

I really like these macro focus adapters, and the bargain is undeniable.

They open up an entire new dimension and solve many complicated issues with old lenses mix and match with cameras.

My plan is to see if I can't just clean them up with some newer grease, and maybe apply dry film lubricant where they may have used synthetic oil instead.

Once the soap in grease breaks down it doesn't hold. It could be an issue of accelerated decay from the environment or just shelf life.

Tuzki with lens