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Messages - emag

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Third Party Manufacturers / Re: Nikon goes Medium Format?
« on: September 17, 2013, 10:38:54 AM »
Some comments from what is admittedly a niche market.....(astro)

The 60Da hasn't sold tremendously well because it was (IMHO) poorly implemented.  More expensive and not as good for astro as modifying a 60D.

Okay, I don't know enough about sensor technology, so if I'm completely out to lunch on this, a virtual slap is acceptable.  How about a MF body with more densely packed region for imaging in FF or APS-C crop mode and still having a lot of pixels on target?  Provides a selectable imaging area (crop mode) for when I want to work with a smaller file size rather than cropping a large image.  In MF mode, mayhaps those pixels can be binned?

Peltier cooling for long exposures.

IR cut filter that is either easily removeable or can be swung out of the light the mirror.
For that matter, something similar for the Bayer filter (okay, I figure that's nigh on to impossible to implement).

A modular design so that if the photographer needs all the bells and whistles sports/weddings/wildlife requires, s/he can install an accessory in battery grip fashion that provides the required processors.  Maybe the Peltier cooling could be a module.

I don't think such a camera is too much of a stretch, and the market might be larger than some people think.  I'd buy one....don't need two kidneys.

try to deactivate  silent mode in the live view menu. That is what is needed in the 7D.
 I think it hast something to do with electronic first curtain.
Turn off exposure simulation also?

Lighting / Re: Lighting large groups, help needed!
« on: September 13, 2013, 09:07:51 AM »
Good to see some folks stepping in to help the OP.....kinda what these forums should be about.  Some people were born professional, experienced photographers.....we mere mortals have to learn.  Have fun and let us know how it works out, Zv!

Technical Support / Re: Which one is accurate?
« on: September 07, 2013, 02:15:08 PM »
Accurate schmaccurate........2nd photo is horrid.  You know it and if you did not know why before posting you do now.

Lighting / Re: Thinking of buying a Light Meter
« on: September 06, 2013, 01:51:24 PM »
99% of hobby photographers, even very serious very capable hobby photographers have no real need for a light meter.

I'm in that 99% group and I have to agree.  I can chimp my exposure and flash settings.  My most used (and useful to me) accessory is a Color Checker Passport.  I actually have an old light meter but haven't used it in very many years.  I think the last time was when I still used film.

A long exposure noise reduction method for astrophotography is the use of a 'dark frame'.  In principal it's similar to LENR but the practice is different.  A number of images are captured with the camera lens/telescope cover in place (i.e. - dark frames), I typically take them when I'm finished with my imaging and am putting my equipment up.  The exposure length is the same as that used for the images ('light' frames).  The dark frames are averaged in post and a master dark frame created which is then subtracted from each light frame prior to stacking the lights.  Ideally, the darks are captured at the same temperature the lights are captured at.  I suppose it would be possible to create a library of master darks at various temperature ranges, but the sometimes (or usually?) random nature of the dark frame noise might preclude that.  In addition to the dark frames, a series of bias frames are also captured, similarly averaged and subtracted.  These are dark frames at short exposure taken to create a master bias frame that hopefully captures the readout noise which is also subracted from the light frames prior to stacking.  With the D60 years ago, Canon was first out the gate with a low noise sensor capable of astrophotography....the reason I and many others adopted Canon DSLRs for astro.

Reason I mention all this is that if you're contemplating a lot of long exposure work, you may find these techniques useful.  For exposures of a few seconds, LENR is probably more practical.  My astro work involves exposures of 90 seconds to 10 minutes, LENR is just not a good option at that point.

Software & Accessories / Re: B+W Filter - No Green Hologram
« on: August 21, 2013, 09:09:08 AM »
The name Schneider says it all, I wouldn't be concerned.  Enjoy your filter.

.......I use 12 high cri fluorescent tubes for my light table, which each put out 2660 lumens, and twice that would be better........

Holy illumination Batman!  I'm squinting just thinking about that... ;D 

Lenses / Re: What's wrong with cheap ND filters?
« on: August 15, 2013, 10:16:35 AM »
I bought this $40 77mm ND1000 filter through ebay ('bondscamera', Hong Kong), brand name on the filter is Camdiox

Also this $21 Cokin P size graduated and ND filter set with holder and adapters through ebay ('mambate', New Jersey)

Both work well for me and my uses.....YMMV.  If you just want to get something decent that is actually available so you can play around with it then I would recommend both of these.  Purists may cringe but they are welcome to PM me so I can give them my mailing address for that elusive Lee Big Stopper and other top shelf items they want to send me. 

I was recently in my local BestBuy and found a 77mm CPL and 77mm ND3 that included a 72-77 adapter.  Reasonable price and they work on all of my larger lenses including the  300/4L and 400/5.6 and most happily the Tokina 11-16/2.8.

I would strongly recommend against a variable ND, there may be some that do not exhibit the cross effect at higher density levels but the vast majority do, particularly any of the lower priced ones.

Technical Support / Re: White balance, how to determine?
« on: August 14, 2013, 09:12:19 AM »
Mr. Bean -

I also have an (equivalent to) Expodisk and have used it extensively.  It is indeed quicker than the Color Checker Passport for setting a custom white balance.......BUT......the passport has so many more uses and is just as simple to carry.  I've really taken a shine to it since I began using it.  You can set up custom camera profiles in Lightroom for various lighting conditions (sunny, clouds, rain, twilight, deep shade, etc.), shoot Raw and select the correct profile in post.  Much less tweaking is needed with such a work flow.  Want to warm skin tones a tad?  Click on the appropriate warming white balance block on the image of the Color Checker.   IIRC, there have been posts on CR from colorblind photographers here on CR who use the Passport to ensure proper color.

Technical Support / Re: White balance, how to determine?
« on: August 13, 2013, 10:32:53 PM »
Color Checker Passport, set up profiles in LR

Landscape / Re: Perseid Meteor Shower Aug. 11-12 2013
« on: August 13, 2013, 12:43:29 PM »
From the you-think-that's-bad department......Florida Panhandle here.  In August, 90% humidity would be considered arid.  Just in case the unimagineable occurs and the sky clears up for one evening, we have Ninja mosquitoes just waiting for us to be foolish enough to set up scopes and cameras.  In all my years here, I have once and only once enjoyed astrophotography on an August night.  It was while a hurricane was crossing central Florida and sucking dry air over Pensacola, dropped to the low 60's that night, it felt frigid.  A few weeks later we were hit by Hurricane Ivan, took out the U.S. Interstate 10 bridge over the bay and knocked out power for weeks.  But oh how gourgeous the skies were after that.....dark, clear, no light pollution.  We slept in the screen room because it was too hot in the house, I still recall seeing the Pleiades rising through the branches of the leafless trees in my back yard.

Software & Accessories / Re: Lightroom 5 versus Photoshop Elements 11
« on: August 12, 2013, 04:29:57 PM »
Pedro -

I use CS2 on Windows 7x64.  I've gradually moved to LR for most of my editing, but sometimes call up CS2 from LR for a photo or two. 

@Harry Muff: I am with CS 2 for about the same time. Can you still run it on let's say windows 7 or 8? Going LR next year with a new Notebook.

Technical Support / Re: Tripod and Tripod Head Question
« on: August 04, 2013, 11:03:37 PM »
I went with an Acratech GP earlier this year, quite pleased with it.  ~400US......but you would certainly not go wrong with the RRS BH-55 either.

Lenses / Re: Wide angle lens' for crop sensor camera
« on: July 31, 2013, 10:35:31 PM »
The Tokina's been great on my 40D and 60D.

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