800mm Mirror Lens at DVinfo.net

Max Worm · March 24th, 2009, 04:42 AM

hello, someone of you has tried this disc of a valve on the 5d (with l' adapter nikon-eos)?
Ciao

http://www.amazon.com/Rokinon-Multi-...906433&sr=1-16

Chris Hurd · March 24th, 2009, 08:55 AM

Ebay Italy link replaced with Amazon link.

Daniel Browning · March 24th, 2009, 10:03 AM

Quote:

Originally Posted by Max Worm

hello, someone of you has tried this disc of a valve on the 5d (with l' adapter nikon-eos)?

Not that one specifically, but I've shot cats and newts with my 5D2. They all have terrible vignetting and doughnut bokeh, but other optical qualities such as sharpness vary widely. Keep in mind that f/8 on a cat is usually like T/11 or so due to the central obstruction.

An 800mm f/5.6 autofocus lens costs $10,600.
A really good cat, such as the Sony 500mm f/8, costs $600.
This 800mm f/8 costs $200.

So it costs 53 times less. Is the quality 53 times worse? No, it's maybe only 20 times worse, so you do get "more than you pay for".

Jon Fairhurst · March 24th, 2009, 10:23 AM

Here's Ken Rockwell's review of Nikon's 500mm f/8 reflex lens. I presume that it's similar in design to the 800mm lens noted above:

Nikon 500mm f/8 Reflex-Nikkor test Review © 2004 KenRockwell.com

Chris Barcellos · March 24th, 2009, 03:06 PM

I will post some preliminary test shots I took with the a combo I would have thought was going to be pretty poor. In a howling win, I took a 400mm Vivitar T lens and added a 2x adapter, also by Vivitar. When I could keep the camera still from the wind, I think the images were pretty good, in comparison with shots with telephoto adapters I use to use on my FX1. As I said, I will post some examples this evening..

One this that is clear to me, and I don't not the reason for it, is that any dust on your low pass imager filter is for some reason made more apparent with long lenses.

Daniel Browning · March 24th, 2009, 03:27 PM

Quote:

Originally Posted by Chris Barcellos

One this that is clear to me, and I don't not the reason for it, is that any dust on your low pass imager filter is for some reason made more apparent with long lenses.

I know that narrow (high) f-numbers cause dust to become more apparent.

Chris Barcellos · March 24th, 2009, 10:24 PM

This is a test using the Canon 5D Mark II, with a Vivitar T system 400mm lens with a Nikon mount. Mounted with a Vivitar 2x adapter bought for $15.00 or so on Ebay. Shot in 30p. Not sure how vimeo will handle change to 24p. But I am tickled that not a lot of CA is showing up. This appears to provide a better image than what I could get out of my FX1 with a teleextender on it.

http://www.vimeo.com/3845090

Daniel Browning · March 25th, 2009, 10:13 AM

Thanks for the video, Chris.

Quote:

Originally Posted by Chris Barcellos

But I am tickled that not a lot of CA is showing up.

That's the neat thing about cats and newts: mirrors reflect all frequencies of light the same way. CA is never a problem on a pure newt, but sometimes the corrector plate (the front element) on a cat can introduce CA.

Chris Barcellos · March 25th, 2009, 03:49 PM

Of course this Vivitar is your standard run of the mill telephoto. See pic attached

March 24th, 2009, 04:42 AM	#1
Max Worm New Boot Join Date: Feb 2009 Location: Rome (Italy) Posts: 20	800mm Mirror Lens hello, someone of you has tried this disc of a valve on the 5d (with l' adapter nikon-eos)? Ciao http://www.amazon.com/Rokinon-Multi-...906433&sr=1-16

March 24th, 2009, 08:55 AM	#2
Chris Hurd Obstreperous Rex Join Date: Jan 2001 Location: San Marcos, TX Posts: 27,368 Images: 513	Ebay Italy link replaced with Amazon link. __________________ CH Search DV Info Net \| 20 years of DVi \| ...Tuesday is Soylent Green Day!

March 24th, 2009, 10:23 AM	#4
Jon Fairhurst Inner Circle Join Date: May 2006 Location: Camas, WA, USA Posts: 5,513	Here's Ken Rockwell's review of Nikon's 500mm f/8 reflex lens. I presume that it's similar in design to the 800mm lens noted above: Nikon 500mm f/8 Reflex-Nikkor test Review © 2004 KenRockwell.com __________________ Jon Fairhurst

March 24th, 2009, 03:06 PM	#5
Chris Barcellos Inner Circle Join Date: Nov 2005 Location: Elk Grove CA Posts: 6,838	I will post some preliminary test shots I took with the a combo I would have thought was going to be pretty poor. In a howling win, I took a 400mm Vivitar T lens and added a 2x adapter, also by Vivitar. When I could keep the camera still from the wind, I think the images were pretty good, in comparison with shots with telephoto adapters I use to use on my FX1. As I said, I will post some examples this evening.. One this that is clear to me, and I don't not the reason for it, is that any dust on your low pass imager filter is for some reason made more apparent with long lenses. __________________ Chris J. Barcellos

March 24th, 2009, 10:24 PM	#7
Chris Barcellos Inner Circle Join Date: Nov 2005 Location: Elk Grove CA Posts: 6,838	Telephoto footage This is a test using the Canon 5D Mark II, with a Vivitar T system 400mm lens with a Nikon mount. Mounted with a Vivitar 2x adapter bought for $15.00 or so on Ebay. Shot in 30p. Not sure how vimeo will handle change to 24p. But I am tickled that not a lot of CA is showing up. This appears to provide a better image than what I could get out of my FX1 with a teleextender on it. http://www.vimeo.com/3845090 __________________ Chris J. Barcellos Last edited by Chris Barcellos; March 25th, 2009 at 09:50 AM.

March 25th, 2009, 03:49 PM	#9
Chris Barcellos Inner Circle Join Date: Nov 2005 Location: Elk Grove CA Posts: 6,838	Of course this Vivitar is your standard run of the mill telephoto. See pic attached Attached Thumbnails __________________ Chris J. Barcellos