Letus Image flipping developement

Kyle Edwards · January 4th, 2006, 06:54 PM

That must account for the 3 month wait.

Michael Maier · January 4th, 2006, 07:39 PM

Quote:

Originally Posted by Kyle Edwards

That must account for the 3 month wait.

Took the words right out of my mouth.

Sean Michael · January 5th, 2006, 01:18 AM

I have the Letus35 Flipped and when I go into a room with a really bright bulb shining, filling the room... my letus35 flipped is really really dark, I mean really dark.

Anyone else having the same problem?

Greg Bates · January 5th, 2006, 01:26 AM

Quote:

Originally Posted by Sean Michael

I have the Letus35 Flipped and when I go into a room with a really bright bulb shining, filling the room... my letus35 flipped is really really dark, I mean really dark.

Anyone else having the same problem?

What kind of lens are you using? There is definitely some light loss in the flipped version....that said I light like i'm lighting for film so I dont really plan to run and gun with it on their. I've got my regular for that. What kind of camera too?

Sean Michael · January 5th, 2006, 01:32 AM

I'm using the DVX100a, with an 35-70mm SLR zoom lens...

Greg Bates · January 5th, 2006, 01:42 AM

Quote:

Originally Posted by Sean Michael

I'm using the DVX100a, with an 35-70mm SLR zoom lens...

What speed lens? at least 2.8?

Sean Michael · January 5th, 2006, 01:52 AM

3.5 I believe

R.P. Cuenco · January 5th, 2006, 01:57 AM

someone stop me if im wrong, but...

having worked on a flipping design before ordering a letus35 flip, the calculated light loss from adding the flip system should be barely noticeable.

assuming its using four front surface mirrors, which have a light reflectivity of >97%, there would be a total light loss of about 88%.

gah, i can't wait till i get mine.

also, i havent seen any 35-70mm zooms out there that are faster than f/3.5
so this might be contributing to your problem. its nice to have a zoom, but some fast primes will definitely help with low light.

Lucas Rodriguez · January 5th, 2006, 03:15 AM

Quote:

Originally Posted by R.P. Cuenco

also, i havent seen any 35-70mm zooms out there that are faster than f/3.5
so this might be contributing to your problem. its nice to have a zoom, but some fast primes will definitely help with low light.

Actually, there are a lot, but they're quite expensive...

For example, Nikon 35-70 f/2.8 (new on ebay)

http://cgi.ebay.com/NIKON-35-70-MM-F...QQcmdZViewItem

Any zoom lens that keeps a 2.8 constant aperture trough the whole focal range is going to be costly, but there are some really nice cheaper alternatives than the Nikon and Canon lens.

Tokina, for example, has a 28-80 f/2.8 lens (the 280 AT-X Pro) with great reviews. There's also a 28-70 f/2.8 (newer), which is slightly inferior in terms of quality (for what I read). Tamron and Sigma also build zoom lenses in those focal ranges with f/2.8 constant aperture.

They're very good to use with adapters, since a variable aperture -like the cheaper and more common f/2.8-f/4, gives you a darkening effect on the image as you zoom in (thus making them unsuitable for most video recording).

In fact, I'm hunting for one of those lenses to use with my Letus :)

Lucas

Greg Bates · January 5th, 2006, 10:11 AM

Quote:

Originally Posted by Lucas Rodriguez

Actually, there are a lot, but they're quite expensive...

For example, Nikon 35-70 f/2.8 (new on ebay)

http://cgi.ebay.com/NIKON-35-70-MM-F...QQcmdZViewItem

Any zoom lens that keeps a 2.8 constant aperture trough the whole focal range is going to be costly, but there are some really nice cheaper alternatives than the Nikon and Canon lens.

Tokina, for example, has a 28-80 f/2.8 lens (the 280 AT-X Pro) with great reviews. There's also a 28-70 f/2.8 (newer), which is slightly inferior in terms of quality (for what I read). Tamron and Sigma also build zoom lenses in those focal ranges with f/2.8 constant aperture.

They're very good to use with adapters, since a variable aperture -like the cheaper and more common f/2.8-f/4, gives you a darkening effect on the image as you zoom in (thus making them unsuitable for most video recording).

In fact, I'm hunting for one of those lenses to use with my Letus :)

Lucas

Yeah, I have a sigma 28-70 that's 2.8.

Michael Maier · January 7th, 2006, 04:15 PM

Quote:

Originally Posted by Quyen Le

When I said 1.5 stop, it's light loss for the whole unit with GG in place. Thanks.

Quyen

So the total light loss of the flip version is 1.5 F-stops? How much for the normal version then?

Michael Maier · January 7th, 2006, 04:19 PM

Quote:

Originally Posted by Ken Lamug

Can't wait until Quyen comes out with a flipped letus in a single barrel.

What difference would it make? None that I see.

Ken Lamug · January 7th, 2006, 08:32 PM

Quote:

Originally Posted by Michael Maier

What difference would it make? None that I see.

it would fit in my lens case :-P

January 5th, 2006, 01:18 AM	#78
Sean Michael Regular Crew Join Date: Dec 2003 Location: Phoenix, Arizona Posts: 49	Dark Footage I have the Letus35 Flipped and when I go into a room with a really bright bulb shining, filling the room... my letus35 flipped is really really dark, I mean really dark. Anyone else having the same problem?

January 4th, 2006, 06:54 PM	#76
Kyle Edwards Major Player Join Date: Nov 2004 Location: LI, NY Posts: 274	That must account for the 3 month wait.

January 5th, 2006, 01:32 AM	#80
Sean Michael Regular Crew Join Date: Dec 2003 Location: Phoenix, Arizona Posts: 49	I'm using the DVX100a, with an 35-70mm SLR zoom lens...

January 5th, 2006, 01:52 AM	#82
Sean Michael Regular Crew Join Date: Dec 2003 Location: Phoenix, Arizona Posts: 49	3.5 I believe

January 5th, 2006, 01:57 AM	#83
R.P. Cuenco Regular Crew Join Date: Nov 2005 Location: Concord, CA Posts: 118	someone stop me if im wrong, but... having worked on a flipping design before ordering a letus35 flip, the calculated light loss from adding the flip system should be barely noticeable. assuming its using four front surface mirrors, which have a light reflectivity of >97%, there would be a total light loss of about 88%. gah, i can't wait till i get mine. also, i havent seen any 35-70mm zooms out there that are faster than f/3.5 so this might be contributing to your problem. its nice to have a zoom, but some fast primes will definitely help with low light.