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Messages - Don Haines

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241
EOS Bodies / Re: Using full frame lens on crop body cameras ?
« on: December 14, 2014, 05:05:54 PM »
A FF lens should outperform a crop lens when used on a crop camera.

Except when it doesn't.  The EF-S 17-55/2.8 IS delivers better IQ than the 24-105L or 17-40L, plus it's a stop faster.  The 17-55 beats the 16-35 II as well as having IS and being half the cost.

In the ultrawide to normal focal ranges, the smaller image circle makes optical design easier.  That, in turn, leads to the potential for either lenses cheaper than 'comparable' EF lenses, or lenses similar in price but with better performance.  As your examples highlight, in the telephoto range all that changes.
+1

There are some lenses that Canon really got right when designing..... like the series 2 big whites.. but for zoom lenses you have to love the 70-200's for FF and the 17-55 for crops.... both examples of superb design that would be very hard to improve on.... and both are within the 3X zoom range limit. It is very hard to do a decent zoom with 4X or more zoom... too much compromise in the design...

242
EOS Bodies / Re: Using full frame lens on crop body cameras ?
« on: December 13, 2014, 11:41:15 PM »
Take a 200mm lens with a 72mm large element. The F value is 200/72, or F2.8.

Take that lens and move it to a crop body.... it is still a 200mm lens with a 72mm large element.... it is still a F2.8 lens. There is no Harry Potter magic going on here... the length of the lens and the size of the elements do not magically change.... it is a 200F2.8 lens period!

None of the optical properties of the lens are going to change. PERIOD!!!!!!!

Imagine two cameras built with the same level of technology.
Camera 1 is a 20Mpixel crop camera. Camera 2 is a 50Mpixel FF camera. The pixels on the sensor are the exact same size.... they are identical. Take a picture with the two cameras and the central part of the FF image will be indistinguishable from the crop image. They will have the same brightness.... they will have the same depth of field.... they will have the same sharpness.




243
EOS Bodies / Re: Using full frame lens on crop body cameras ?
« on: December 13, 2014, 11:25:26 PM »
A better quality lens is a better quality lens. Period.

If you use it on FF or if you use it on a crop body, it will produce higher image quality than an inferior lens. Period.

A 200F2.8 lens designed for a FF camera will have the same size big element as a 200F2.8 lens designed for a crop camera. The only differences would be that the internal elements would be slightly smaller.... but not very much so. The optical design for the two cameras would be VERY close... if not identical.....

To design an EFS lens to be smaller than it's FF counterpart, you have to change the optical design so that the last element group bends the light more sharply than the FF counterpart. Sharper bends are bad! They are much harder to do well and all things being equal, you get an inferior lens. Plus, the light hitting your sensor is at a greater angle than with FF lenses... this can mean photons not hitting the active part of the sensor and that means less light.

A FF lens should outperform a crop lens when used on a crop camera.

244
reminds me of the definition of waste.... a bus of lawyers going off of a cliff with an empty seat....

and the difference between a dead skunk on the road and a dead lawyer on the road...... there are skid marks before the skunk....

245
EOS Bodies / Re: Focus problems with the Canon 7DII?
« on: December 11, 2014, 02:49:24 PM »
Has anyone else had this happen, and if so, what did you do?

Interesting, because I would have expected the exact opposite: My single-point 6d/60d completely screw up in falling snow because with just one piece of information, the camera cannot decide if it's a subject or "gras/snow/... in front of subject" lock. I'd guess that with multi-af, the camera should be smarter, at least in theory.

The camera did nothing when you pushed the shutter.... no hunting and no shutter release... It took me a minute or two to realize what was happening... If I pointed it at the deer, nothing. If I pointed it at a nearby tree, it worked. It was as if you had a distance switch set to focus on close objects only. (there is no such switch on the 17-55) I swapped lenses out for a 70-200 and it did the exact same thing. I tried manual focus and the shutter would release, but absolutely dead in auto-focus mode when you pointed it at a more distant object....

I am going to have to re-read the AF system manual and see if the various setting have any impact.

246
EOS Bodies / Re: Focus problems with the Canon 7DII?
« on: December 11, 2014, 01:59:55 PM »
I took the 7D2 out in a snowstorm.....

The lens was a 17-55F2.8.

The autofocus system would not lock on anything unless I put it into single point mode..... and in that mode I would get it to focus about half of the time. I figure it was because in multiple AF point modes that it was looking at objects (snowflakes) at random distances and got confused. This never happened on the old camera (60D), probably because the AF system was not sensitive enough.

Has anyone else had this happen, and if so, what did you do?

247
Sorry , but it is no longer the world's most expensive picture.

I just sold the following picture, "Angry Cat" to an undisclosed "Crazy Cat Lady" for $10,000,000......

According to the art world, the sale is a publicity stunt, and Lik has a habit of doing so.... Undisclosed buyer... completely unverifiable.... This is no different than having one's spouse write a check for $10,000,000 on your own bank account and giving it to you.....

248

Let's try this, then...to have the 5DIII directly geotag images requires you to buy a Canon accessory that must attach to the hotshoe (precluding use of an E-TTL flash) or attach via a cable (compromising the weather sealing); the 1D X does not.


Come on now Neuro..... You know the 5D3 isn't really weathersealed... :)

The weathersealing is one of the big advantages the 1DX (and 7D2) have over the rest of the lineup...

249
Third Party Manufacturers / Re: Reviewing Olympus 40-150/2.8
« on: December 09, 2014, 12:14:14 PM »
I used to shoot Olympus 4/3  until they abandoned the format for the micro 4/3 format. They were far more innovative than Sony/Nikon, or Canon and had a lot of firsts in the digital SLR world. Some of the lenses were outstanding, like a 14-35 at a constant F2.0, a 50-200F2.8, and all the cameras and lenses were weatherproofed.

When they went to the micro 4/3 form factor the ergonomics died with the move.... then, after years of waiting, they released the E-5 as their flagship model, a camera that was inferior in every respect to every other DSLR on the market.... That's when we knew it was time to abandon ship.

Since that day about 6 years ago, the selection of fast micro 4/3 lenses has been scarce. Here's hoping that this is a sign of things to come and that they can turn things around.

I was in pretty much exactly the same position as you. I had the E-3 and an E-620 but it became pretty obvious they were giving up on DSLR cameras in favour of mirrorless so I sold my kit and moved to Canon. At the time I thought the m4/3 system would be limited to the PEN form factor and cheap zoom lenses, so I kind of wrote it off, but looking at it now, I think it takes better advantage of the small sensor, and with the new lenses it starts to make sense as a system.

Some days, I still pine for my Zuiko lenses, the 12-60 f/2.8-4 especially.
Yeah.... that 12-60 was a fine lens.... that and the 50-200 made a good walk around kit...

250
EOS Bodies / Re: A new high end camera
« on: December 09, 2014, 10:07:12 AM »
DPAF has not shown up on Canon FF....
The 7D2 sensor shows some substantial improvements on what has gone before.....

I still think that Canon is going to close down it's old fabrication line and that as a result, there will be updates to all the DSLR's (except the 70D and 7D2) in the next few years... so it is very probable that the 1DX or 5D3 get updated soon.


251
Third Party Manufacturers / Re: Co-worker dumps $5k on Nikon
« on: December 09, 2014, 09:40:19 AM »
I had a friend with a prosthetic leg who moved very slowly that purchased the top of the line Eddy Merckx racing frame back in the late 90's. He would go on rides of no longer than 2 miles and 12 mph on flat terrain. True, he could have accomplished these feats with a $300 hybrid from Fred Meyer.


But he got out there.... GOOD FOR HIM!!!!!!

Perhaps it was the psychological boost of having the expensive bike and the fact that it pedaled just that little bit easier that got him going for rides and that if he had a cheap bike, it would have just sat and collected dust...

Perhaps it is the same for this lady. She buys a fine tool and uses it lightly, while a cheap tool would be left home on a shelf.... None of us are in her mind, we don't know what is going on. Rather than criticize, offer encouragement.

252
Third Party Manufacturers / Re: Reviewing Olympus 40-150/2.8
« on: December 09, 2014, 09:33:43 AM »
I used to shoot Olympus 4/3  until they abandoned the format for the micro 4/3 format. They were far more innovative than Sony/Nikon, or Canon and had a lot of firsts in the digital SLR world. Some of the lenses were outstanding, like a 14-35 at a constant F2.0, a 50-200F2.8, and all the cameras and lenses were weatherproofed.

When they went to the micro 4/3 form factor the ergonomics died with the move.... then, after years of waiting, they released the E-5 as their flagship model, a camera that was inferior in every respect to every other DSLR on the market.... That's when we knew it was time to abandon ship.

Since that day about 6 years ago, the selection of fast micro 4/3 lenses has been scarce. Here's hoping that this is a sign of things to come and that they can turn things around.

253
hmmmmmmmm.........

The 5D3 was designed as an all-round camera.....
The 7D2 was designed to fit a niche......

What do you think? 
The 5D2 seemed to be a wedding/portrait body only -- a true niche.  The 5D3 upped the ante for weddings, portraits and events plus pulled it out of the niche category by making it a reasonable alternatively for less demanding action.

I wouldn't put the 7D2 in the niche category, it seems to belittle its other talents.  The 7D2 appears to be the new king of the crop bodies for all subject matter that truly excels with action photography.  Plus it is a genuine pro body in build quality.
Just my opinion, but to me the 1DX and the 7D2 hold down the top spots in the Canon Ff and Crop world, while I would put the 5D3 and the 70D as the all round cameras in their categories......

254
hmmmmmmmm.........

The 5D3 was designed as an all-round camera.....
The 7D2 was designed to fit a niche......

What do you think?

255
EOS Bodies / Re: Hyperfocal Distance
« on: December 08, 2014, 09:01:16 AM »
in the good old days, it was marked on the lens body.....

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