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Messages - J.R.

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241

This is the diffraction myth. Diffraction is diffraction, it is the same regardless of the sensor. The difference in pixel size simply means your imaging the lesser effects of diffraction sooner, but that does not make the effect worse. Diffraction is purely optical, so whether you are using a FF sensor, an APS-C sensor, or a small 4/3rds sensor with even tinier pixels, you should really NEVER worry about diffraction.

Read this:
http://jonrista.com/2013/03/24/the-diffraction-myth/

So, technically speaking, stopping down to f/11 is stopping down to f/11...the ultimate result on IQ in reach-limmited scenarios (same lens, different cameras, same subject distance) is roughly the same regardless of FF vs. APS-C (technically, APS-C would actually have the edge, barring blurring from other factors...i.e. the 7D has a stronger low pass filter than the 5D III, which mitigates some of the benefit of having smaller pixels, but not entirely.) Smaller pixels will always give you a cropping advantage, and the more you stop down, the returns offered by those smaller pixels simply diminish until they offer no benefit over larger pixels (but at no point would smaller pixel EVER be "worse" than larger pixels from the standpoint of diffraction...noise is another matter.)

Thanks for the link. Pretty good points.

I ran across this post by Roger Cicala at lensrentals blog. He comes up with roughly similar findings using narrow apertures on a D800 -

http://www.lensrentals.com/blog/2013/03/overcoming-my-fentekaphobia


242
a large section of the buyers of the Tammy will end up using them on the APS-C cameras where diffraction sets in real early - sometimes as soon as f/6.3. If you were to stop down to f/11, how much do you think the images will suffer in sharpness?
I did that test several days ago....
Here are the unprocessed bit-level crops for the Tamron 150-600 at various Fstops using a 60D

F11 is ever so slightly better than F8

Indeed they look better. I'm now tempted to try one when it becomes available in India.

BTW, I'm yet to see your cat photos with this lens   :D

243
Thanks Alan,

@ f8 and smaller, Tammy shows better IQ in 600mm. This is good news for those want long zoom & shooting at slower shutter speed.

I'm no expert in BIF photography. Last time I tried, my shutter speed was in 1/2000ish.

F8 + 1/2000ish =  ??? IQ

I hear you brother!

The f/8 or narrower makes it a deal breaker for me. I typically shoot birds in a well wooded area. The foliage makes it difficult for me to keep ISOs under control with the f/5.6 aperture. It's all very well shooting in bright daylight but for the shooting I do, I'm yearning for f/4 or faster lenses ... f/8 just won't cut it even with the high ISO performance of the 5D3/6D

Owning a 600mm f/4 lens myself, I can tell you that you are often limited by too-thin DOF than you might expect. At 600mm, an f/4 aperture results in VERY THIN DOF. Quite often too thin. Unless you are photographing particularly large birds (which seems unlikely in a wooded area), even if you owned a 600mm f/4 lens you will find yourself somewhere between f/5.6 to f/8 often enough anyway. It does help having f/4 as an option, and when you really get down to the wire (near sunset in a wooded area) then you open up and deal with the DOF issues regardless.

But having an f/4 lens does not necessarily mean you are always shooting at f/4.

Ha ... I didn't think about that ... Thanks Jon!

I do my birding with the 100-400 right now and being limited to 400mm and f/5.6, I've not run into any serious DOF concerns - that will sure change with a supertele as you quite rightly point out above. The 100-400 isn't the sharpest of lenses and combined with super high ISOs, my pictures turn out too soft and lacking detail - I usually blame high ISOs for the lack of detail and noise and hence my cringing for a faster lens.

I've used the 600 only a few times but that was for shooting shore birds in reasonable light so I could stop down happily without any concern over the ISO. 

Jon, a large section of the buyers of the Tammy will end up using them on the APS-C cameras where diffraction sets in real early - sometimes as soon as f/6.3. If you were to stop down to f/11, how much do you think the images will suffer in sharpness?

244
Reinz ... Not to sound like an ass but ... what are you trying to prove here?

I'm interested in the A7 + a kit/prime lens and have the special luxury of getting approx 20% discount on almost all Sony products so I'm wondering whether it is worth the plunge. Somehow I feel that a 55mmm prime + a A7 will be a great tool while on my travel.

I am however, NOT AT ALL interested in using one with an adapter. For me, the only point in the Sony is the smaller form factor that I can use while I'm traveling. For anything that requires a Canon lens, I'll happily use my DSLR. 

245
Canon General / Re: Canon Will Attend The Photography Show in March
« on: February 11, 2014, 12:44:36 PM »
Canon will be making a major annoucement at this show.

Who cares ... "What will come will come ... and we'll be here to see it when it does"

246
Lenses / Re: 24-70 f/2.8 L II front coating peeling off?
« on: February 11, 2014, 12:40:21 PM »
I wonder if I have to worry. I just got this lens with no chance to use it yet.

Up to now users of this lens have reported the following:

1. Bubbles in the glass.
2. Clicking when zooming
3. Marks from filters that come in contact with lens (albeit Roger from Lens Rentals reported the problem happening only with no-name cheap filters but still...)
4. Damage in coating.

Mine does not have bubbles, and does not click when zooming. Plus, it seems that the Hoya HD2 does not come into contact with the front element.

So I will just have to worry for coating in a few months...  ;D

I'm pretty much wondering the same as well. I hope using the lens at 40C+ temperatures won't have an effect on this lens which is almost always on one of my cameras :-\
For about 8 months of the year, I routinely use my lenses (Canon, Nikon, Tamron & Sigma lenses) in temperatures ranging between 40°C to 55°C (104°F to 131°F) in very dusty desert conditions, and during 2 of those months, (August & September), extreme  humidity is also added to the high temperatures ... but so far nothing like this has ever happened to any of my lenses ... of course, all my lenses (with the exception of EF 40mm pancake) have B+W filters on them for protection.

That's comforting ... though 40C+ temperatures won't be. with all the problems cited for the 24-70II, I feel lucky I don't have one and I' sure hope it stays that way!~

247
Canon General / Re: So much redundancy...
« on: February 11, 2014, 12:38:29 PM »


Speaking of... when is the 200-400 1.4x coming down in price?

If you get any hint then please do let me know. I'm getting one of these heavyduty babies in April and it would be good if I could save some $$$ (I don't expect it to come down in price though ... and I'm not getting the Tamron)

248
Canon General / Re: So much redundancy...
« on: February 11, 2014, 12:36:12 PM »
Sh*& ... After reading your post I had to look at the lenses I had to check whether I had an overlap anywhere and it seems that I have ... 85L + 135L + 70-200L II IS (makes me look like a fool). But then I realized that I bought the primes because of the awesome shallow DOF the primes offer. Also, I recently purchased the 17mm TSE which overlaps with the 16-35 II but would you call that redundancy?

IMHO, overlap in focal lengths is acceptable as long as the lenses offer something different to each other for the sake of creativity / functionality. If it doesn't ... put it up on the local CL and get something that you really want / need.

249
Lenses / Re: 24-70 f/2.8 L II front coating peeling off?
« on: February 11, 2014, 12:21:27 PM »
I wonder if I have to worry. I just got this lens with no chance to use it yet.

Up to now users of this lens have reported the following:

1. Bubbles in the glass.
2. Clicking when zooming
3. Marks from filters that come in contact with lens (albeit Roger from Lens Rentals reported the problem happening only with no-name cheap filters but still...)
4. Damage in coating.

Mine does not have bubbles, and does not click when zooming. Plus, it seems that the Hoya HD2 does not come into contact with the front element.

So I will just have to worry for coating in a few months...  ;D

I'm pretty much wondering the same as well. I hope using the lens at 40C+ temperatures won't have an effect on this lens which is almost always on one of my cameras :-\

250
Thanks Alan,

@ f8 and smaller, Tammy shows better IQ in 600mm. This is good news for those want long zoom & shooting at slower shutter speed.

I'm no expert in BIF photography. Last time I tried, my shutter speed was in 1/2000ish.

F8 + 1/2000ish =  ??? IQ

I hear you brother!

The f/8 or narrower makes it a deal breaker for me. I typically shoot birds in a well wooded area. The foliage makes it difficult for me to keep ISOs under control with the f/5.6 aperture. It's all very well shooting in bright daylight but for the shooting I do, I'm yearning for f/4 or faster lenses ... f/8 just won't cut it even with the high ISO performance of the 5D3/6D

251
Thanks AlanF.

How do you find the AF for bird tracking (I know you shoot critters)? AF on Tamron lenses has been questionable in the past so it would be great if they have sorted this out in this lens. 

252
Third Party Manufacturers / Re: Panasonic Lumix GH4 ...
« on: February 11, 2014, 12:42:46 AM »
...

Apparently you misunderstood my post. Oh, well ...

I understood your post quite well enough. Quite frankly, I am unable to understand your constant moaning that Canon is not offering the camera specced the way you want it at the price you want. 

For the type of photography that I do, an xxxD is more than adequate.

Canon products are used by thousands of professionals who create awesome images. In the above quote, you fairly concede that the Canon products that you own also work well enough for you but still you end up on this forum constantly whining and  complaining and predicting doom for Canon. You also conveniently ignore all facts and figures that are thrown in your face by various posters. 

The market never lies, if you think it does it is entirely your own problem.

Another one of the ABC brigade that joins my ignore list ...

253
Third Party Manufacturers / Re: Panasonic Lumix GH4 ...
« on: February 10, 2014, 12:10:57 PM »
Shallow DOF

I've seen too many crappy photos due to too shallow DoF to rate that as a plus for "full frame".

Crappy photos are the result of crappy photographers and sensor size has nothing to do with crappy photos ... Too bad you have too many of such to deal with ... Your loss!

BTW, some people never miss something they never have.

254
PowerShot / Re: More Product Confirmations for CP+
« on: February 10, 2014, 09:21:21 AM »
well canon can´t do it right...

really im so sick of reading these brainless and childish complains.... get out... get a job... take photos.  :P

Looks like the recent DXO bitchfest thread got to you as well :P

255
Photography Technique / Re: Photography fail moments !!!
« on: February 10, 2014, 09:18:07 AM »
After starting this thread on 6th of February citing photography fail moments of someone else, I got my comeuppance with a fail -

I had traveled to New Delhi on business late last week. I had planned to travel light with just the RX100 because I was sure I wouldn't get any time to shoot given the extremely tight traveling schedule. Just as I was about to start from home, I got a call from my friend who asked me to get my DSLR along as he wanted pictures of his children taken while I was in Delhi. I dutifully packed in the 5D3 + 24-70 and a 50mm.

Meetings were originally planned for Friday and Saturday and as luck would have it, the Saturday meetings got cancelled giving me most of the day free. Given the opportunity, I visited the Auto-Expo and gleefully started clicking photographs.

Bummer ... the 32 GB Sandisk card was over 90% occupied and I noticed it only once it got full. Not having a spare CF card, I couldn't full format the card and was resigned to reviewing / deleting individual photos from the card since I hadn't transferred the images existing on the card to my desktop PC.

After an hour of haggling with the camera freeing up space - shooting, freeing up space - shooting, I realised that I was also carrying my RX-100 which was not being used and which CONTAINED a 32GB CF card. Feeling utterly idiotic, I removed the card from the RX-100 and used it in the 5D3.

Another fail on the same day ... went to shoot the Auto-Expo and forgot to take the CPL along. The glare from the overhead lights killed off enough shots to make me cry  :'(

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