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Messages - Ophthaltographer

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Technical Support / Re: Another my Stupid question = Sensor Sizes
« on: August 21, 2014, 08:25:29 PM »



Make the pixel smaller and you get more resolving power, but at the expense of less light, worse low light performance, and less flexibility with exposure times and apertures.

[/quote]

I believe the number of pixels a sensor has determines it's resolving power not the size of the pixel.  Large sensors with 18 (large) MP will resolve the same as a tiny sensor with 18 (tiny) MP.


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I have a TVC-24L / BH-40LR and am 5'10".  The BH-40 was recently updated a few months ago (1 notch instead of 2 and smaller T lever) and I doubt you would have any problem with drift.  Having had both, I much prefer the lever to the screw clamp.  Your eye height is 64-4=60".  The TVC-24 is 49.2" + 7"(ball and camera) = 56.2".  So on a flat surface you would have to bend down 4".  You can try it at home by setting up your current tripod with the camera eyepiece 56.2" above the floor.  I tend to bend over 2-3" when shooting so it's doable but not ideal.  Oh and don't bother to ask RRS to cut down a TVC-24L a few inches, they won't.  That all said, I find the TVC-24L, BH-40LR in the TQB-72 bag remarkably compact.

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Lenses / Re: What Lenses are missing from Canon's range
« on: July 21, 2014, 08:00:11 AM »
150mm f/2.8 IS macro

400mm f/5.6 IS

4
Software & Accessories / Re: Tripod center column - yes or no
« on: July 07, 2014, 09:06:25 PM »
It's been said before that the prefect tripod has three characteristics - rigidity, height, and portability.  Unfortunately you have to decide which two are the most important since no tripod has all three.  Center columns sacrifice rigidity for portability.  Portability sacrifices height without a center column.  I ended up selling my Induro series 2 CF with a center column for a RRS series 24L CF without a center column. No regrets and as the RRS salesman pointed out your second airline portable travel tripod (<20 inches) is replaced by checking lugage.

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PowerShot / Re: Canon S110 vs S120
« on: January 06, 2014, 04:49:10 PM »
This is a good review of the S120 giving high marks for it's touch screen focusing, perhaps the most important upgrade to the S110.  The S120 is compared favorably to the Sony and Lumix given it's price point and pocket-ability.

http://www.cameralabs.com/reviews/Canon_PowerShot_S120/index.shtml

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Lenses / Re: Portrait: 85mm 1.8 or 100mm 2.0
« on: November 21, 2012, 11:15:54 AM »
I find the 85mm is more versatile for portraits unless you are doing only head and shoulder shots and even then it's quite easy to crop a bit with a 5D3 and get the 100mm eqivalent.

7
Lenses / Re: Canon 24-70 ii in stock at Onecall and PC.Nation
« on: September 28, 2012, 07:53:35 AM »
When the 5D3 first became available, I ordered it and a 16-35L lens from One Call.  They shipped each seperately Fed Ex requiring a signature which is One Call's policy.  When the 2 boxes arrived in town, it took an additional 3 days to get me and the boxes in the same place at the same time.  A Fed Ex nightmare which could have been averted if the boxes had been sent to my office and not my residence.  Lesson learned.  One Call was great to work with though.

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Lenses / Re: Canon 24-70 ii in stock at Onecall and PC.Nation
« on: September 27, 2012, 09:16:00 PM »
Why Spammer when I type PC. Nation.

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Lenses / Re: Canon 24-70 ii in stock at Onecall and PC.Nation
« on: September 27, 2012, 09:10:36 PM »
This morning I noticed Spammer listed the lens in stock and I purchased 1 of the 3 units they were expecting to receive this afternoon.  It was shipped this evening and the lens is now again listed as backordered.  I believe today's was the fourth shipment they have received in the last few weeks so they seem to be getting a steady supply.  Very friendly and helpful staff.

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Lenses / Re: Roger at LensRentals impression of 24-70 II
« on: September 11, 2012, 04:09:12 PM »
Wow those are some seriously impressive results, sharper than the 24 ts-e and the 70-200@70mm?!  I expected it o be good but damn that's outstanding.

+1

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I pre-ordered from B&H one month ago so I probably have little chance of catching the first wave of deliveries.  This is the same scenario I had with the 5D3 in the Spring.  However I was able to cancel my pre-order when a fellow forum member mentioned 5D3s were available on the West coast - so if you find availability please share.

12
EOS Bodies / Re: A question about dust...
« on: September 03, 2012, 07:20:51 PM »
My 5DII did get a fair bit of dust, and required cleaning every couple of months.  I've had my 7D for longer, and it's never needed cleaning - I expect the smaller sensor is better for that.  The 1D X has an improved cleaning system compared to the 5DII and 5DII (which are the same), I hope it does better than the 5DII...

Which 5D models have the same cleaning systems?  So far after 5 months of heavy use my 5D3 remains clean.

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Lenses / Re: 200mm 2.8L II
« on: September 03, 2012, 07:13:41 PM »
I bought the lens 8 years ago to capture high school sports.  It was excellent on a crop body (20D & 40D) for indoor volleyball and Friday night football under the lights.  Never missed having to carry a 70-200 which I figured would be at 200 mm 98% of the time anyway.

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Yes thanks so much for sharing your research.  Have tried cleaning the sensor with a Lens Pen?

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Lenses / Re: Canon EF 24-70 f/2.8L II Has Made its Way To Retailers
« on: September 02, 2012, 10:32:55 AM »
Great!  So looking forward to my pre-order being filled and the German rumor proving incorrect.  I am tiring of looking at the world with only a 16-35 mm and a 70-300 mm perspective. 

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