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Topics - RGF

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Lenses / Any word on new 16-35 F4
« on: June 14, 2014, 05:19:21 PM »
just wondering if this lens has surfaced or is about to surface?

Lenses / How to Calculate DOF for a 180 Macro Lens (in macro mode)
« on: May 12, 2014, 10:57:40 PM »
I am interested in how to calculated DOF with a 180 macro lens so I can determine how much to move a focusing rail.  If the focal length was truly 180, then it would be simple.  But I have heard when a macro lens is focusing close, the focal length is actually much shorter than when the lens is focusing at infinity.

Canon General / Professional Business insurance
« on: April 23, 2014, 11:37:23 PM »
There have been several (at least, perhaps more) on equipment insurance.  What about business insurance (professional liability).  If someone get hurt by your equipment, etc. I don't want to be held personally responsible.

Any suggestions?  I am think of doing a bit of work, not full time, but never the less, what to make sure I am covered.

Software & Accessories / Looking for a focusing rail
« on: April 02, 2014, 12:39:08 PM »
With spring nearing, I am thinking that I would like to get use a focusing rail to help my macro work.  Ideally it would be great to have a motorized setup, but with the need for power (batteries) that would make the rig too large to take to the field.

Next best would be a stepping rail with some sort of gear knob to allow me to move the camera in fine increments.

Any experience/recommendations? 


Software & Accessories / any records to raw to both cards?
« on: March 12, 2014, 04:36:33 PM »

Does anyone record raw to both cards simultaneously?  This would give a bit of extra security in case a card failed, but seems like over kill since I have yet to have a card die in the field.


EOS Bodies - For Stills / HELP - strange 1Dx AEB behaviour
« on: February 16, 2014, 12:32:35 AM »
Or at least I think it is strange

I set my 1Dx to AEB (firmware v2.0.3) in manual exposure mode.

According to the manual, the camera should adjust the shutter speed.  What I observed is that the camera adjusts whatever is on the main dial.  When I have the aperture control on the main dial, it is adjusted.  When I have the shutter speed on the main dial, it is adjusted.

Is something wrong with my camera/firmware or is the quirk in the firmware?



I am considering buying a high MP body for landscapes.  Right now Canon does not a high MP body (5DM3 is 22 MP), not quite high MP.

As i see it, there are 2 high MP 35mm bodies - Nikon D800 and Sony alpha A7R.  I think both use the same sensory though there is a difference in cost - the nikon is 3300 vs 2300 for the Sony.

I think it will be easier to attach a canon lens (such as the 17mm T/S) to the Alpha as well as attach the Nikon 14-24 to the Alpha (is this true) than the Canon 17mm T/S to the Nikon.  Is this true?

Other lens to consider?  With the Nikon 14-24 is there any reason to use the Canon 14mm?

Other thoughts are welcome.


Lighting / Technical specs for Canon 600 flash
« on: January 21, 2014, 11:29:00 AM »
Looking to understand how my flash works.  Like how does high speed synch work in detail- for example, what is the number of times it flashes at different shutter speeds, why does it go into high speed synch at 1/250 in Av mode but not M mode.

Lighting / Reco for on flash diffuser
« on: January 21, 2014, 11:26:18 AM »
Looking to buys diffuser for my 600-ex flash. I have looked at the lumiquest and honl and there seems to be a lot of to choose from. Like most products, reviews are mixed with some people pointing out the diffusers slip and other to mentioning a problem.

Software & Accessories / Reco for on flash "soft box" that travels well
« on: January 19, 2014, 09:52:01 PM »
I am looking for a soft box attachment for the Canon 600-series flash.  I need this device to (1) travel well and (2)  e stable on the camera.  Ideally I would not like to attach velcro glue strips to the flash but realize that these may be the best way to secure the soft box attachment.

Thanks in advance for all the (great) ideas.

EOS Bodies - For Stills / Problem with 1Dx AWB on cloudy days
« on: January 01, 2014, 06:57:56 PM »
I find that AWB on my 1Dx cameras does not work well.  Is this problem well known? Is there a fix for it (other than setting color temp to cloudy)?

Software & Accessories / Reco Config for Mac Pro (2013)
« on: December 29, 2013, 11:18:55 AM »
I am thinking of buying the new Mac Pro (2013) for Photoshop work.  Wondering what configuration is "best" for PS and LR cc.

4 vs 6 cores - leaning towards 6 cores
32 GB Ram - occasionally work on files with large number of layers or 16x48 pans.  Total size on disk is top 2GB.
GPU - base 300 or upgrade to 500?  Monitors will be current spectra view 25" and 23" (not 4K)

Nearly zero video editing

does this make sense?  What about the GPU?  Recommendations?



Lenses / Replacement foot for Canon 600II
« on: November 18, 2013, 05:43:49 PM »
Yes I just got.

I am looking for a replacement foot for this lens.  Both the regular foot and short foor take up extra rooms in the bag  take up too much space in the bag.  I am lookig ath 4th genreation design (see or the Wimberley AP-602 (

Both are very low and can not be used as a handle but will save considerable room in the camera bag when traveling.

Any opinion?  Any other choices?  My fall back position is the monopod foot that came with the lens.



Software & Accessories / New Sandisk Extreme card
« on: November 08, 2013, 03:22:25 PM »
I notice Sandisk has introduced a new Extreme CF card - package is gold. This could be old news, but wonder how fast these cards are compared to the Extreme Pro CF card (VPG-20 vs VPG-65) in a Canon 1Dx.


Software & Accessories / Looking for information on a "beam tripper"
« on: October 05, 2013, 05:37:28 PM »
At least that is what I have heard it called.

Either fires the camera based upon sound or when the beam of light is blocked, hopefully has an adjustable delay.  I imagine capturing a drop hitting the surface of water, balloon exploding, egg exploding, ... 

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