Victor Engel

Lives in Austin, TX
Joined on Dec 21, 2002

Comments

Total: 114, showing: 1 – 20
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So it's using 4 images to eliminate the need for Bayer interpolation, and then the addition two because they really missed having to interpolate. :)

Link | Posted on Jan 21, 2018 at 16:38 UTC as 7th comment
On article Canon patents 400mm F5.6 catadioptric 'mirror' lens (220 comments in total)
In reply to:

Victor Engel: How about an off-center catadioptric lens? Does such a beast exist? Essentially, it would be like a cylindrical section of a normal catadioptric lens plus extra housing for the secondary mirror. The front element of the lens would be off center with respect to the sensor. The advantage is that you wouldn't get the donut bokeh. But maybe instead you'd get some other weird asymmetrical bokeh.

Variable aperture from f/8 to f/32. Apparently there were two models, with MFD of 6.25 and 16 feet, respectively. That 6.25 MFD is pretty close for a 500mm focal length.

Link | Posted on Dec 18, 2017 at 02:03 UTC
On article Canon patents 400mm F5.6 catadioptric 'mirror' lens (220 comments in total)

How about an off-center catadioptric lens? Does such a beast exist? Essentially, it would be like a cylindrical section of a normal catadioptric lens plus extra housing for the secondary mirror. The front element of the lens would be off center with respect to the sensor. The advantage is that you wouldn't get the donut bokeh. But maybe instead you'd get some other weird asymmetrical bokeh.

Link | Posted on Dec 17, 2017 at 17:53 UTC as 14th comment | 7 replies
On article Sony developing a 400mm F2.8 G Master lens (134 comments in total)
In reply to:

Nomoreheroes: The mirrorless size advantage yes?

Fun fact: the camera body is detachable from this lens, and you can put other camera bodies on it.

Once a lens gets to a certain size, it seems to make more sense to refer to the camera being attached to the lens rather than the lens attached to the camera.

Link | Posted on Oct 26, 2017 at 01:39 UTC
On article Sony developing a 400mm F2.8 G Master lens (134 comments in total)
In reply to:

Nomoreheroes: The mirrorless size advantage yes?

Pffft. If this lens can be handheld, a 400mm f/2.8 on a mirrorless can be. :) http://www.grafikdesijn.com/uploads/5/7/1/4/57140203/camerashake-longlens_orig.jpg

Link | Posted on Oct 25, 2017 at 15:43 UTC
On article Sony developing a 400mm F2.8 G Master lens (134 comments in total)
In reply to:

yslee1: Really should've have launched this with the A9.

Bgfreeman, your answer seems to assume they can release only one lens at a time....

Link | Posted on Oct 25, 2017 at 15:40 UTC
In reply to:

melgross: Sigh! This is a really oversimplified explanation of why we want, and need higher bit depth.

Well, it's better to oversample than to undersample, though.

Link | Posted on Sep 4, 2017 at 03:02 UTC
In reply to:

RPJG: "... their ability to provide enhanced creative control over perspective through the tilt function and depth-of-field through the shift function in their images."

I'm probably going to regret asking this, but isn't that back to front? I thought you used tilt to control DOF, and shift to control perspective?

Sure - just as people who use TS lenses know which function has which effect.

Link | Posted on Aug 30, 2017 at 14:54 UTC
In reply to:

RPJG: "... their ability to provide enhanced creative control over perspective through the tilt function and depth-of-field through the shift function in their images."

I'm probably going to regret asking this, but isn't that back to front? I thought you used tilt to control DOF, and shift to control perspective?

Actually, perspective is controlled only by camera position. It's distortion that is controlled by shifting. The perspective remains the same.

Link | Posted on Aug 29, 2017 at 20:57 UTC
In reply to:

aftab: Canon Video.

https://www.youtube.com/watch?v=2l3XrBwP_vQ

Apparently, these lenses are good for shooting sushi. :)

Link | Posted on Aug 29, 2017 at 13:42 UTC
In reply to:

PWPhotography: Congrats to Canon, not only make for Canon but for Sony system as well :-)

Ironically Canon TS-E lenses actually are much easier to use on Sony A7/A9 series due to EVF, much easier for precise MF, full-time liveview, focus peaking (much easier for Tilt function) and WYSIWYG exposure as well as IBIS to gain a few stops in hand-held under dim light, and you don't need to leave eye from EVF. On Canon DSLRs you'd need to use back LCD for precise focus (magnification) and accurate exposure when T/E out.

... Or you can use something like Camranger.

Link | Posted on Aug 29, 2017 at 13:36 UTC
In reply to:

DaQi: I saw this post and decided to look at my pictures of the eclipse that I took in Casper WY to see if I might have captured the transit. My pictures are no where near as good as these but I can clearly see the sunspots that are in this picture. Now, this is where it got interesting for me. As I was looking at my pictures the curve of the moon is quite different in this sequence from mine. In my pictures when it as low as it is in these pictures on the right hand edge (i.e. almost aligned with the lower sun spot) the top sun spot is covered already. Banner is about 130 miles North of Casper so I am trying to understand how the angle of the moon covering the sun was that much different there than where I was. Bottom line though is that I went through my pictures and must have missed the transit. I was taking a series of 5 bracketed pictures every couple minutes. Also missed the one on the other end of the eclipse as well.

I was in Jackson with a group of strangers. I wondered out loud to one of them where the ISS was. Maybe it was right there as I was wondering about it. :)

Link | Posted on Aug 27, 2017 at 03:35 UTC
In reply to:

digiart: Nice footage. Pity the camera did not capture the nearby jet @ 5:30, by the sound it must have been close! Info on the height the balloon reached would be nice.

I saw a jet in the video. Take Another look - right side of screen.

Link | Posted on Aug 27, 2017 at 00:50 UTC

"All of the photos were shot wide open at f/1.8 (no other option really...)"

The other option is f/2.8 by using the 2x camera.

Link | Posted on Aug 8, 2017 at 15:29 UTC as 7th comment
In reply to:

(unknown member): Anyone considering wasting money on this piece of fluff should read Dororthy Rabinowitz' Wall Street Journal review entitled "The Dumbing Down of ‘Dunkirk’".

Stick to Batman movies, Mr. Nolan.

For the record, I was not the one asking what you found fluffy.

Link | Posted on Jul 27, 2017 at 22:31 UTC
In reply to:

(unknown member): Anyone considering wasting money on this piece of fluff should read Dororthy Rabinowitz' Wall Street Journal review entitled "The Dumbing Down of ‘Dunkirk’".

Stick to Batman movies, Mr. Nolan.

Perhaps a better review of the film here: http://www.slate.com/blogs/browbeat/2017/07/20/what_s_fact_and_what_s_fiction_in_dunkirk.html

Link | Posted on Jul 24, 2017 at 00:21 UTC
In reply to:

(unknown member): Anyone considering wasting money on this piece of fluff should read Dororthy Rabinowitz' Wall Street Journal review entitled "The Dumbing Down of ‘Dunkirk’".

Stick to Batman movies, Mr. Nolan.

Well, I saw it - standard 70mm. The only real criticism I have about it is the music. Well, I guess character development could have been improved. I don't have an account with the WSJ, but I think I found a copy of the article. I think the author missed the point. It's not a movie about Dunkirk, really. It's a movie about several people's attempts to live another day through the perils of war. What war it was, or whether Churchill was relevant is beside the point.

Link | Posted on Jul 22, 2017 at 05:38 UTC

Apparently, I thought a photo was altered that wasn't. The photo had very fake-looking ground as if it had been poorly cloned. Oh, well. I guess some people live around fake-looking ground.

Link | Posted on Jul 21, 2017 at 23:50 UTC as 30th comment
In reply to:

(unknown member): Anyone considering wasting money on this piece of fluff should read Dororthy Rabinowitz' Wall Street Journal review entitled "The Dumbing Down of ‘Dunkirk’".

Stick to Batman movies, Mr. Nolan.

Maybe I'll read it after I see it. I purchased tickets for a70mm version some time ago, and I'll be seeing that tonight. It's not an IMAX theater, but it does have a high screen. I'll be curious to see what format is used.

Link | Posted on Jul 21, 2017 at 23:21 UTC
On article SainSonic launches 50mm F1.1 lens for APS-C cameras (252 comments in total)
In reply to:

George_pix: Using a ruler on my pc screen, if the filter is 52mm this lens is 50 1.25 not 50 1.1. What do you think?

You're making me hungry.

Link | Posted on Jul 7, 2017 at 22:30 UTC
Total: 114, showing: 1 – 20
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