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Messages - Lee Jay

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226
Lenses / Re: New Rebel & EF 11-24 f/4L USM Coming Shortly
« on: January 16, 2015, 01:01:08 PM »
I'm not completely sure about the math, but at 24mm I believe you would have to make a multirow panorama, and in order to that competently and eliminate parallax you would need something elaborate like a Really Right Stuff Multi-Row Pano Elements Package which will run up to $915.

I built my own, very easily, for under $50.

Uh huh, how'd you pull that off?

http://imageevent.com/sipphoto/panoramahead

227
Lenses / Re: New Rebel & EF 11-24 f/4L USM Coming Shortly
« on: January 16, 2015, 12:23:42 PM »
I'm not completely sure about the math, but at 24mm I believe you would have to make a multirow panorama, and in order to that competently and eliminate parallax you would need something elaborate like a Really Right Stuff Multi-Row Pano Elements Package which will run up to $915.

I built my own, very easily, for under $50.

228
Lenses / Re: New Rebel & EF 11-24 f/4L USM Coming Shortly
« on: January 16, 2015, 12:03:45 PM »
Why do you need an IS on a Wideangle, anyway? With a lense of this focal length you need not more than maybe a native 1/20 to freeze a picture... what do you want to capture on 11mm, except of architecture, nightsky or landscapes? Both would be better on tripod.

I recently took a couple of cave tours.  It's very dark, and I was shooting with my 15mm fisheye on full-frame.  To get the best IQ I was trying to keep ISO to 1600-3200 which was giving me 1/4th to 1/6th of a second at f/2.8.  Tripods are not only not allowed, but would be totally impractical even if they were due to slippery, wet, uneven ground.

229
Lenses / Re: New Rebel & EF 11-24 f/4L USM Coming Shortly
« on: January 16, 2015, 11:37:23 AM »
I created these many years ago just to show what wide rectilinear images look like.
19.2mm:

16mm:

12mm:

10mm:

8mm:

230
Lenses / Re: New Rebel & EF 11-24 f/4L USM Coming Shortly
« on: January 16, 2015, 09:15:25 AM »
Finally and replacement for the Sigma 12-24. A useful but deeply flawed lens.
erm....$3K??? Really?

Let's think about that a bit.

This lens is basically a zoom version of the 17TSE.  So, you have to remove the tilt and shift mechanisms, but add a zoom mechanism, design zoom elements for the zoom with good correction, and add a an autofocusing mechanism.  All in all, this lens is probably a bit more complex and harder to build.

The 17TSE is $2,250 street, and it's not brand new.  Is $750 more for a lens that's more complex and brand new that surprising?

231
Lenses / Re: New Rebel & EF 11-24 f/4L USM Coming Shortly
« on: January 15, 2015, 09:38:00 PM »
And everybody complained about the price if 24-70LmkII and lack of IS, but I don't see price dropping that much - because it IS the best 24-70 in every mount. Bought one, didn't regret it.

I wanted one.  Because it doesn't have IS, I didn't buy one or consider buying one, and I never will.  I have too many 1 second to 1/4 second shots on my 24-105 to give up the IQ that goes with being forced to shoot at three stops higher ISO because of this glaring error.

I have never once thought my 24-70 2.8Mk2 needs IS. Does all photography before the advent of IS suck? Technology may help your work but it isn't necessary. You are the greatest piece of gear.

Which would you prefer, an ISO 3200 shot or an ISO 25,600 shot?

232
Lenses / Re: New Rebel & EF 11-24 f/4L USM Coming Shortly
« on: January 15, 2015, 08:55:34 PM »
And everybody complained about the price if 24-70LmkII and lack of IS, but I don't see price dropping that much - because it IS the best 24-70 in every mount. Bought one, didn't regret it.

I wanted one.  Because it doesn't have IS, I didn't buy one or consider buying one, and I never will.  I have too many 1 second to 1/4 second shots on my 24-105 to give up the IQ that goes with being forced to shoot at three stops higher ISO because of this glaring error.

Increasing ISO 3 stops to compensate for lack of IS costs A LOT in image quality.  Carrying a tripod on travel is a non starter.


I see what you're saying but in that case may I offer you some classical photography tools such as TRIPOD or just bumping ISO on your camera?

233
Lenses / Re: New Rebel & EF 11-24 f/4L USM Coming Shortly
« on: January 15, 2015, 07:36:51 PM »
And everybody complained about the price if 24-70LmkII and lack of IS, but I don't see price dropping that much - because it IS the best 24-70 in every mount. Bought one, didn't regret it.

I wanted one.  Because it doesn't have IS, I didn't buy one or consider buying one, and I never will.  I have too many 1 second to 1/4 second shots on my 24-105 to give up the IQ that goes with being forced to shoot at three stops higher ISO because of this glaring error.

234
Lenses / Re: New Rebel & EF 11-24 f/4L USM Coming Shortly
« on: January 15, 2015, 03:39:09 PM »
I wonder how big would be DOF if that lens would be 2.8 - would that even be usable?
Hyperfocal distance would be only 4.71 feet at 11mm and f/2.8.

Thanks. For some street shooting (people closeups rather than whole scenes) should be enough.

Seems like you don't know what hyperfocal distance is.  This means everything from half the HD to infinity would be acceptably sharp for a modest print like an 8x10 handheld.

235
Lenses / Re: New Rebel & EF 11-24 f/4L USM Coming Shortly
« on: January 15, 2015, 12:41:35 PM »
I wonder how big would be DOF if that lens would be 2.8 - would that even be usable?

Hyperfocal distance would be only 4.71 feet at 11mm and f/2.8.

236
Lenses / Re: New Rebel & EF 11-24 f/4L USM Coming Shortly
« on: January 15, 2015, 12:29:27 PM »
f4 is fine most of the time for Landscape photographers as already pointed out. However not all of the time and slow lenses at dusk when most sensors in Canon line-up currently are under 12 stops of DR creates either high ISO with the noise that goes with it or no shot.
If the DR improved then f4 becomes less of a problem on a $ 3500 lens.

Canon sensors are just as good at high ISO as the competition.  This "DR" thing only applies below ISO 400 or so, and only significant at ISO 100.  So, unless f/2.8 buys you exactly the move from ISO 200 to ISO 100, the competition wouldn't be any better, really.

237
Lenses / Re: New Rebel & EF 11-24 f/4L USM Coming Shortly
« on: January 15, 2015, 12:27:45 PM »
Wait, this is a full frame, non-fisheye lens that runs at 11mm?!  That sounds pretty spectacular all by itself.  Has that  ever been done before?

That was exactly my question. Any law of physics expert to comment? What is the possibility of successful rectilinearity at that focal length?
That would open up a brand new perspective of lifestyle photography.

The 17 TS-e is already this wide, you just need to shift and stitch to capture it all because a full-frame sensor isn't big enough.

And those of us that do panos have been seeing wider than this basically forever.

238
Lenses / Re: New Rebel & EF 11-24 f/4L USM Coming Shortly
« on: January 15, 2015, 11:48:58 AM »
Doesn't look like it would take screw on filters.

Looks like it already has a screw-in light bulb installed.

I'm not seeing the usefulness of the 11-24.

I'm keeping my $369 15mm f/2.8 fisheye!  I can defish it effectively to anything between 7mm equivalent and 20mm equivalent.  Yeah, you lose some detail, but I don't care.

239
Lenses / Re: canon 7D2 with 100-400 ii lens with 1.4 Extender for birds
« on: January 14, 2015, 06:16:31 PM »
I am waiting for DxO to do a full test of the lens - whatever anyone says about the site when comparing Nikons with Canons, they do a good job of comparing Canon lenses on different bodies.

No they don't.  And worse, if you don't know how to interpret their results, you'll actually come to exactly the wrong conclusions.
Why don't they?

Because they only do system tests, not lens tests.  System tests are shot through an AA filter, thus they don't represent the capabilities of the lens.
Not to be argumentative, but Alan said, "they do a good job of comparing Canon lenses on different bodies."   I think that's an accurate statement, and that's what my comment was about.

Because they're all tested through AA filters, on sharper lenses they are nothing but tests of the AA filter.

240
Lenses / Re: canon 7D2 with 100-400 ii lens with 1.4 Extender for birds
« on: January 14, 2015, 05:00:35 PM »
I am waiting for DxO to do a full test of the lens - whatever anyone says about the site when comparing Nikons with Canons, they do a good job of comparing Canon lenses on different bodies.

No they don't.  And worse, if you don't know how to interpret their results, you'll actually come to exactly the wrong conclusions.
Why don't they?

Because they only do system tests, not lens tests.  System tests are shot through an AA filter, thus they don't represent the capabilities of the lens.

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