DSMC2 Speedboster for everyone!

[Eirik Fiskkjønli]

Allright, the title might be somewhat misleading. I am sure some of you will think this is redicolus..

Very much inspired by James Miller - read his fabulous thread here:
http://www.reduser.net/forum/showthread.php?162915-Speed-Booster-OLPF-Caddy-3D-Print

I have now digged myself deep into the 3D printing rabbit hole - and i love the possibilities - highly reccomended.

The nice thing with this solution is that no sensor adjustment should be needed, due to the new lens mount with a shorter flange distance (I have never adjusted my sensor so should be in stock position - i can ofcourse not guarantee that no sensor adjustment will be needed). To avoid adjusting the sensor - you could also rotate the speedbooster outwards.
This will make you able to reach infinity focus if not able to with a fully seated speedboster into the holder.
It is very convenient to have as a tool - only having to switch OLPF and mount, and not perform a sensor adjustment.

It is ofcourse not perfect - a 3D printed lens mount might be the redicolus factor for some.
In the future if i see the need, i am thinking of contacting this company to custom make a mount to match the new flange distance when adding the speedbooster:
https://c7adapters.com/en/products

Some footage for comparison only, nothing exciting:

After doing this test i observed a light skewed vignetting - this is fixed now.


First of all, i did this mainly for myself, but after spending countless of hours (Weeks to be honest) on it - I thought maybe others might want it too and at the same time get paid for my time.
Might sound like much for some plastic - but taking into account development, printing time (4,5hrs per kit) and shipping i think it is fair.

What will it cost?
200 Dollars for this speedbooster, currently on sale: https://www.bhphotovideo.com/c/product/1295246-REG/vello_lag_nex_cef_canon_ef_lens_to.html
150 Dollars for the 3D printed parts, shipping included to make it simple (If you want DHL express that will be ekstra).

So 350 Dollars in total for a speedbooster for your DSMC2 camera - as long as you have a OLPF to use with it.


Read this guide prior to phurchase:
https://drive.google.com/open?id=14Ujesjb8n9vjcX3xlL9177D559q_EaDy


Positives:

• 35MM FOV @ 7K FF with the Helium sensor (S-W should be fine @ 5K FF / Gemini should be fine @ 4,5K FF - i guess based on sensor size)
• One extra stop of light hitting your sensor
• Shooting slowmotion without S35 FOV cropping (To some extent ofcourse)

Negatives:

• No lens control
• No 8K FF without vignetting
• Plastic lens mount
• Some added flare due to speedboster elements

I do have 10 kits ready for shipping.

Even though I have no clue if anyone want to buy this, i have to say if there is high demand - have some patience since I am not able to produce many units a day with my one 3D-printer.
If it break down, it might cause a huge delay.

If you want to purchase, send me a email to: Fiskkjonli.media@gmail.com

Included in the package:

Any questions?


Some other stuff i have printed:

Side handle cover:

Carl Zeiss ZF.2 Lens gears:

Home made wireless SDI transmitter by the use of black magic SDI to HDMI converter together with the Amimon CONNEX Wireless Mini HD Video Link:

Simple adapter ring for my Zip box filter holder:

 

[Jacek Zakowicz]

We could convert these to a proper machined parts and add proper lens mounts, we already sell them anyway. If we could get , say 20 Redusers committed I think that would be doable...

 

[Misha Engel]

We could convert these to a proper machined parts and add proper lens mounts, we already sell them anyway. If we could get , say 20 Redusers committed I think that would be doable...

Would a passive e-mount be possible?

 

[Jacek Zakowicz]

Would a passive e-mount be possible?

Not easily. The lens would have to mount inside the camera body. But it could be achieved with optics added. Not really a practical solution IMO...

 

[Misha Engel]

Not easily. The lens would have to mount inside the camera body. But it could be achieved with optics added. Not really a practical solution IMO...

Thanks for your insights, to bad those Fujinon MK's are great zooms considering the price point.

 

[Jacek Zakowicz]

Thanks for your insights, to bad those Fujinon MK's are great zooms considering the price point.

Fujinon sales and engineers made sure that those $3.5K lenses do not cross over into the $10k, 20K, 50K, 80K lens territory. They put a pretty clear barrier there..

 

[Misha Engel]

Fujinon sales and engineers made sure that those $3.5K lenses do not cross over into the $10k, 20K, 50K, 80K lens territory. They put a pretty clear barrier there..

Yep on Venice only 4k and the MAVO 6k for around 8.500 pound ex.vat. in the UK.

 

[Jacek Zakowicz]

Honestly I don't know who possibly will use these lenses, or any e-mount lenses on the Venice. I think they put it there because they could. It wasn't even functional when I checked it.

 

[Misha Engel]

Honestly I don't know who possibly will use these lenses, or any e-mount lenses on the Venice. I think they put it there because they could. It wasn't even functional when I checked it.

FS7 & FS5 users and fuji x-mount users.

 

[Jacek Zakowicz]

FS7 & FS5 users and fuji x-mount users.

I think that's a different level camera. The sensor size, resolution, form factor, price is so distant from the FS5 and FS7 that it is going to be very little overlap in production. The Venice is a descendant to the F65
The FS5/7 is a step up from their still camera line. Not much in common in reality...

 

[Eirik Fiskkjønli]

We could convert these to a proper machined parts and add proper lens mounts, we already sell them anyway. If we could get , say 20 Redusers committed I think that would be doable...

A metal lens mount would for sure be the optimal solution, but it feels very sturdy even with my 820g ZF.2 15mm f/2.8.

I just printed 10 sets of this, thought maybe some would love the idea of owning a cheap speedbooster now rather tan later.
A metal lens mount could be added later.

By following the guide - i estimate that the work you have to do will not take more than an hour tops.

 

[Martin Stampe]

We could convert these to a proper machined parts and add proper lens mounts, we already sell them anyway. If we could get , say 20 Redusers committed I think that would be doable...

If the optical performance holds up I’m in!

 

[Minu Park]

We could convert these to a proper machined parts and add proper lens mounts, we already sell them anyway. If we could get , say 20 Redusers committed I think that would be doable...

I am one of your dude always +1 here.

 

[Nick Gardner]

A metal lens mount would for sure be the optimal solution, but it feels very sturdy even with my 820g ZF.2 15mm f/2.8.

Not even so much strength, but tolerance wise, can a plastic 3d printer even get within .010" ?

Nick

 

[Eirik Fiskkjønli]

Not even so much strength, but tolerance wise, can a plastic 3d printer even get within .010" ?

Nick

Aah, i see.

The parts were printed with a layer height of 0.007874 inches / 0.2mm.
I can print with twice the resolution, but it wold take double of the time.

In the mount i have assembled and use there is a slight variation to either side. But for the max variation we are talking 0.14mm / 0.00551181102 inches.

I am no optical engineer (I am an engineer though for my day job), but i guess that would be hard to spot in a scene.

Maybe someone here have the experience with this?

 

[Nick Gardner]

Have you measured anything? Each layer being theoretically .008" is one thing, whats the margin of error and how many layers?

Nick

 

[Nick Gardner]

BTW, not being judgy, mainly just curious. I have a machine shop, and it can be hard to hit tolerances for lens mounts with extremely accurate machine tools, so I wonder how melty plastic works ;-)

Nick

 

[Karim D. Ghantous]

Eirik, that's some good work there! I know that 3D printing filaments can be very strong and light, but as for precision, I have no idea. Nick has some good questions.

 

[Jacek Zakowicz]

Given that speed booster is essentially a lens, it's performance is affected by the same errors as any lens. Tilt, decentration, backfocus location will all deteriorate the performance to a degree. For 3 micron Helium sensor pixels every bit of performance is needed. Obviously same goes for the lens mount.
For playing around the plastic 3d printed .2mm precision is fine. For professional gear it is not. Plastic may or may not hold the glass securely and in the same location. Last thing one needs to worry about is the lens falling off or the OLPF dislodging and hitting the sensor cover glass. For back yard testing this is fine. For filming set/location it is liability, even if it holds up well which I think the OP says it does.
We have three- any more takers?

 

[Eirik Fiskkjønli]

Have you measured anything? Each layer being theoretically .008" is one thing, whats the margin of error and how many layers?

Nick

Sorry for the late reply.
Fully understand your concern.

Oh, i have spent alot of hours measuring. Both prior to making the parts and after printing the parts.
The nice thing with FFF-printing (Fused Filament Fabrication) is that even though each layer is a few micro meter off the total steps for the motors will be the same. One layer can be "too high" and the next one will be squeezed a bit more flat.

Not here to fool anyone, have already stated that a plastic lensmount isnt optimal, but it works.
As for tolerances, just measured the same spot on all the 10 mounts i have available:

• 17,21mm
• 17,17mm
• 17,22mm
• 17,22mm
• 17,25mm
• 17,27mm
• 17,17mm
• 17,28mm
• 17,27mm
• 17,20mm

Hence a variation of 0,11 mm / 0,0043 inches

The nice thing is that both the speedbooster element can be screwed outwards a tiny bit to nail the infinity focus (If needed) and the sensor itself can be adjusted a tiny bit to get the infinity focus on point.

My goal for myself was to avoid adjusting anything, and i am getting repeatable prints that hits the mark.
The way i have been testing is using my ZF.2 85mm @F/1.4, then placing my camera-sensor-mark 2m from a vertical object. Due to the long focus throw in this lens it is very noticeable if anything is off.


I have to get some better footage for sure, i do understand that people dont want to waste $550.


For the approach itself - to making this - i used both my vello adapters i had for my A7SII.
Speedbooster EF adapter depth: 25,9mm
Regular EF adapter depth: 21,9mm
There we get the necessary reduction of depth for the Redmount adapter: 25,9 mm - 21,9 mm = 4 mm

The Canon EF RED-mount i measured to 22,2 mm.
Hence my target depth for using this speedboster was 22,2 mm - 4 mm = 18,2 mm.
I do see now that it ended up being 18,34 mm +/- 0,08 mm. Which is corrected by the speedbooster/OLPF holder.

Hope this makes any sense.