72mm mount and bayonet mount

C

calito

Active member
Talking about guerilla 35 they mention that their product has two types of mounts 72mm and bayonet mount.

I don't really know what those are. But what I'm really curious about is the type of lens one would be able to use with it.

Does someone care to enlight me?
 
72mm is the size of the filter thread on a DVX100 - so it would just screw onto the front of the camera lens.
Bayonet mount is the type of connection on SOME cameras that have removable lenses. I believe the Canon XL1 and XL2 have bayonet mounts so you would remove the lens and attach the device where the lens was originally.
 
Sirius_Doggy said:
72mm is the size of the filter thread on a DVX100 - so it would just screw onto the front of the camera lens.
Bayonet mount is the type of connection on SOME cameras that have removable lenses. I believe the Canon XL1 and XL2 have bayonet mounts so you would remove the lens and attach the device where the lens was originally.
Click to expand...
So what kind of lens can I use? Still photography ones? Or do I still have to use the really expensive for motion picture cameras?
 
Braskar said:
Talking about guerilla 35 they mention that their product has two types of mounts 72mm and bayonet mount.
Click to expand...

What they probably mean is their "bayonet" mount is the kind that clicks into place where
the sunshade is on the DVX camera, NOT the removeable-lens type bayonet mount.

Making a lens product to connect to a camera bayonet mount is a super complicated
process because you're in fact, building an entirely new lens for the camera. You'd need
focus, backfocus, iris control, or if you're like P+S technik, perhaps even a ND filter wheel.

You can almost be certain these guys aren't doing anything at all like this. I bet use the
word "bayonet" the same way Century Optics has "bayonet" lens accessories for the DVX.

Hope this helps clarify some confusion. Barry would know for sure, but mums the word.
 
In the context of these lens adapters, I would expect that bayonet mount is referring to the same thing it does in Century Precision Optics' terms -- they're talking about the way the lens hood mounts on the DVX. That's how Century's lenses attach -- they don't screw into the filter threads, they "bayonet" onto the mount where the lens hood fits.
 
What about the lens? What kind of lens will one be able to attach there? I'm asking this because I saw an image of one prototype and it looked liked the lens they had there was a Nikor. Will it matter if the lens is one orginally for still picture cameras or for motion picture cameras.
 
Braskar said:
Will it matter if the lens is one orginally for still picture cameras or for motion picture cameras.
Click to expand...

Yes, they are entirely different. Perhaps the most noticable difference is a still negative
is twice the size of a 35mm motion picture negative because the film is run through
horizontally on a still camera vs. vertically on a motion picture camera. The aprox. neg.
size on still is 24x36mm and on film it is 22x18mm (FullAp, no sound) So, the biggest
difference is the there is more depth of field for a given "mm" of lens on film and less
depth of field on still. These little adapters probably use Nikkor or Canon mounts.

If they were smart, they'd just use a Canon mount and let everyone buy mechanical
adapters to fit Nikkor lenses on the Canon mount, as the Canon mount will work with
six different brands of lenses. I would think that reducing feature set on their adapter
would make it overall less money, but who knows.. !?
 
thisiswells is right - a true bayonet-style mount is super complicated. you may want to look at the micro35 (www.micro35.com and www.redrockmicro.com/forum) on how that is mounted in combination with support rods.

Just for comparision, the micro35 has a universal lens mount that you can get options for nikon, canon, pentax, PL and OCT-19. An interchangeable approach has it's advantages in that you can buy more than one mount and use the nikon for everyday, and maybe switch to the PL if you want to rent some Cookes for the big shoot.

regarding SLR and cinema lenses, a lot of the talk in differences has been less about the image quality and more about the control one has over the lenses (such as follow focus), the speed of the lenses, and their breathing. Still lenses were designed for 1-time setup and shoot. cinema lenses were designed for variable focus, so there is far less breathing in those.

Brian
 
Brian,

You may or may not know this, so I'll mention it. JBK Cine will make geared focus rings for
SLR lenses for like $70 per ring.. They don't look very "pro" but they do the job. Quite a few
of the mini35 folks have used his service as it's by far the lowest price in the biz.

SONYHDVKIT.JPG

"Custom" Ring; They're cut down to size from a pre-fab molding for any lens.

Not affiliated with the guy and I don't like anything else he makes, but these don't look too bad.
Hope this helps.
 
bvalente said:
Still lenses were designed for 1-time setup and shoot. cinema lenses were designed for variable focus, so there is far less breathing in those.
Brian
Click to expand...

I don't mean to muddy the water, but that statement is not entirely true. GOOD Cine zooms won't breathe for example $65,000 Angenieux lenses, Cooke S4's and the better Zeiss primes. On the same hand most Nikon Primes don't breathe either. It's when you get into cheaper still Zoom lenses that you start to see noticeable breathing.

For anyone out there who is considering using a PL mount because they want to rent some primes in the future. Consider this. The rental on a box of Super Speeds might only be a few hundred dollars. But the insurance for that $30,000 box of primes will kill you. You can pick up some nice FAST Nikons for what you would pay for a weekend rental plus insurance. If you own a box of primes, you don’t need to be reading this because you know this already, and I'm jealous.

I’m not going to get into a debate over which product is better. They are two VERY different products. We’ve designed the Guerilla35 to be as much as possible a part of the camera. The current version is meant for the compact form factor of Nikon lenses. With our product you can run with the camera, mount it on a hostess tray, go fully handheld Hold it above your head, or on the ground, mount the camera to a nail-on plate on a wall, whatever. It’s very versatile. That is what I feel the advantage of DV is. Why take that away? We do not feel you should have to be tied down to the limitations of camera support.

I finished a feature a few months ago shot with an X-Prod. (Arguably the most hand holdable “light” S-16 camera). A fair amount of the film was handheld. I’m a pretty big guy, but with no full time AC combined with holding a 17lb camera for 12 hours a day, it was a pain. If I can shave 1 lb off of my product I will. Those are the things that are important to me. I’m a shooter, this product is made for shooters.

Thanks!

Jonathan Houser

Jon@guerilla35.com
www.guerilla35.com
 
thisiswells said:
You may or may not know this, so I'll mention it. JBK Cine will make geared focus rings for
SLR lenses for like $70 per ring..
SONYHDVKIT.JPG

"Custom" Ring; They're cut down to size from a pre-fab molding for any lens.
Not affiliated with the guy and I don't like anything else he makes, but these don't look too bad.
Hope this helps.
Click to expand...

Wow, that is great to know. Thanks!

J-
 
Thanks a lot guys. I'm going nuts with this stuff. I had no idea that there was such a thing as the micro 35mm. I saw the website. Unfortunately there aren't many pictures there. I'm really interested in getting something like it. I've already emailed the micro 35 staff for more info. I need all the help I can get. If any of guys have any more info to volunteer, it is really appreciated.
 
Hey guys - that follow focus looks great - I may get one myself! is there a web address to take orders, and is the follow focus mechanism also sold along with the ring?

I'm sorry I wasn't too clear on the intent of my post, so please let me take another stab at it. I wasn't discussing g35 vs. micro35, and I wasn't debating the merits of SLR vs. cinema lenses. I wasn't mentioning zooms at all.

All I was saying is that due to the original intent of the lenses some of the SLR zooms tend to breathe. I have also heard the newer SLR aren't as prone. I personally own a set of nikon primes, and I think they're great.

Also on the PL mount, a product that has interchangeable mounts (such as the micro35) allows people to switch from the less expensive SLRs to Zeiss, Cooke, etc. when their job (and budget calls for it). That's all.

Also, as much as *I* like the above follow focus, these guys already have ff setups for their cinema lenses, or maybe have invested in a chrozsiel.

I am a shooter too, and many of the folks at micro35 are shooters as well. Personally I'm not going to invest $60k in a set of Cooke primes but I can appreciate talking to a lot of filmmakers and DPs who have expressed interest in the micro35 and want this kind of flexibility

Cheers

Brian
 
The better place to buy his follow focus (which is very cheaply made, IMHO) is on eBay.
He sells them there regularly for much less than the prices listed on his website.
 
It doesn't look like it's made very well. I don't like it. I'm a bit of a snob when it comes to equipment. For example, I don't like Chrosziel matteboxes, either.

I think he sells them on eBay for like 599 or 549 sometimes... I think it's worth that much.
But, I wouldn't even think about paying his retail price for that hunk of junk.

Brian
 
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