- Banned
- #141
Ken Corben
Banned
Mike you ROCK!
Where do I send my deposit?
Sharky
Where do I send my deposit?
Sharky
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Mike you ROCK!
Where do I send my deposit?
Sharky
Hey Mike,
Are you related to Evin Grant at all?? Fantastic post there and something that cleared a lot of things up for me. How are the designs for the housing coming along?
Cheers,
Mark.
... via a shim behind the lens mount ...
Hello all,
After some discussion with a variety of folk, for domes, the conclusion seems that the Aquatica 8" dome is the target to beat (in terms of folk wanting to get 100 to 110 degree FOV). It's a cast dome, so the surfaces will be the most concentric. Then marry it up with a +2.5 diopter plano-convex lens (ensure it's very well coated).
On the Ivanoff trail, I'm told that getting a FOV greater than 90 degree is going to be challenging (the ports get to be BIG). So maybe I was chasing the wrong thread on this one ...
It's really good news that the Canon EF-S 10-22 is attracting so much attention, from the u/w community. I suspect that if you have a good sample (their quality control seems better than other similar vendor lenses in this category) I doubt you will notice any significant differences for u/w work when compared to the mega $-priced Zeiss optics (this is ignoring how fast the lens is). The port optics will be the critical factor.
Finally, I made contact with Stephen Greenaway a few weeks back, he makes an interesting housing (http://www.greenawaymarine.com/1C.HTM).
For folks based in the UK, it may prove worth having a chat with him. I'll certainly be popping down to see him soon and look at one of his 'OPTOLITE PORTS', which has many of the properties I'm looking for. What are the FOV limitations (keeping edge quality in mind) ?
I wonder how hot the RED ONE will run ? I was not planning on an aluminum housing, but I guess it would be better for heat dissipation ?
Finally, who is likely to be the first UK RED ONE which is being planned to be housed (anybody in the first 100) ? Would they be interested to meet up somewhere in the UK to share first impressions of the RED ONE ?
Hello all,
After some discussion with a variety of folk, for domes, the conclusion seems that the Aquatica 8" dome is the target to beat (in terms of folk wanting to get 100 to 110 degree FOV). It's a cast dome, so the surfaces will be the most concentric. Then marry it up with a +2.5 diopter plano-convex lens (ensure it's very well coated).
On the Ivanoff trail, I'm told that getting a FOV greater than 90 degree is going to be challenging (the ports get to be BIG). So maybe I was chasing the wrong thread on this one ...
Finally, I made contact with Stephen Greenaway a few weeks back, he makes an interesting housing (http://www.greenawaymarine.com/1C.HTM).
For folks based in the UK, it may prove worth having a chat with him. I'll certainly be popping down to see him soon and look at one of his 'OPTOLITE PORTS', which has many of the properties I'm looking for. What are the FOV limitations (keeping edge quality in mind) ?
I wonder how hot the RED ONE will run ? I was not planning on an aluminum housing, but I guess it would be better for heat dissipation ?
...
isn't the optolite just an Ivanoff or modified Ivanoff type corrector?
...
By the way, how did you come up with 2.5 diopter? by my calculations it should be closer to +3 which is probably easier to find.
The other point: Both canon lenses i,e, the 10mm -22mm and the 28mm-300mm vary their aperture when you focus with them right? That would preclude the use of a matt box if using it for normal filming out of water.
Mike right now you have me totally convinced to go the canon route. But are you certain or more importantly is [Erik] at birger engineering 100% certain that we will have focusing and image stabilisation with those two lenses mentioned. That would be trully awesome, i am in:biggrin:
Aperture varies with zoom, not focus. At any given focal length the aperture is constant.Quote
Yes and yes. Product shipping for many years. But, don't buy lenses until we do a little more testing, and offer a quality rating. Some may be better suited than others.Quote
The 28-300 might be a bad choice. It is a push pull zoom (not rotary) and it varies in length a great deal. Longer at a longer focal length, which is going to be an issue with a dome. The 70-200's are a much better choice, available in f/2.8 with and without image stabilization, and in an f/4. Focusing and zoom are both internal, which means the lens does not change length.Quote
This obviously leaves a hole in coverage. Unfortunately you are going to need a third lens.
We will have done more testing by NAB... Which is when a (big) announcement will be made... Don't mean to be elusive. We want to do some more testing and evaluation before we announce whether we have a great product or a really great product; and at least be able to offer an initial indication as to which lenses we will be recomending, and possibly more importantly, recomending against.
Not sure how to reply in multi quotes but:
I was meaning the outer part of the lens changes, therefore might effect the use of a matt box on those type of lenses when zooming.
Even better since i have the 300mm prime ordered anyway, the 70-200mm f2.8 would be fine with image stabilization wow. But i cant seem to figure how the focusing works, since the lens is a photo lens rather than a cine lens, are you saying your iris focusing would make the zoom track focus?
I understand about the lenses so will hold off till NAB
All looking really good then, exciting stuff.
Mike the begionner
I will not agree that Canon will be probable better glass then RED zoom or prime.
I have noticed that Canon EF lenses drop in price lately.
Also I see, not only from my experience, that the glass is too soft for more than 1-1.5MPixels (RGB) presentation. I have a feeling that Canaon is preparing completely new lenses with new glass in it for its 8MP and up sensors.
RED has all options open right now for experimenting with glass and the design of the lenses. I agree that there is a difference between distinguishable and noticeable, for some time though. Since we are witnessing a revolution going on in the digital cinema, very fast, the consumers (not the cinematographers) will get used to the better quality of material and will demand it.
So if we want to sell our material two maybe even 4 years from now we better watch the quality, it has to be at minimum full 2MP (RGB) and lenses have to support it.
IMO, 2MP (RGB) resolution I will rate at 6 to 8 MP of single CMOS sensor.
Nice work guys...this thread is producing some interesting answers! Very cool...
Aluminum: In the first "Splash your RED" thread, in mid-January I mentioned that my custom surface sports housings have almost always been made of aluminum. It is strong, lightweight, and dissipates heat very well. IMO, for the same reasons, aluminum may be the way to go for dive housings also. Link: http://www.reduser.net/forum/showthread.php?t=370&highlight=aluminum+housing
Ken (Sharkguy) can coordinate with you guys on when/where we can hook up to measure the camera. Being a surface water sports producer/shooter, I'm happy to help out my subsurface shooter relatives in any way I can!
Evin or Brook: IMO water shooting, whether it be surface water sports, or subsurface adventure/nature shooting belongs in the family of genres that is non-hardlined EFP, and occasionally hardlined EFP. It is usually in the sports, adventure travel, or documentary genres. Perhaps this thread should be moved to the "EFP/ENG for RED" forum?
I'm certainly not saying they are better, I am suggesting that they are at least very close. Again, I am primarily talking about the L-series lenses which are the pro line for full frame film shooting, which is 2.5 times the size of the RED imager. Not only are these lenses designed for pro use with similar resolution requirements (is anyone suggesting that the 12MP Mysterium is sharper than the best 35mm films from Fuji and Kodak?) - but we will be shooting with the (usually better) center portion of the lens image only.
We aren't going to know any of this for sure until we get our hands on actual samples. However, I think we can reasonably speculate about what ballpark we are in, and given the lenses and resale value that I spoke of in the previous post - I think the downside of using the Canons is very small.