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Topics - bluenoser1993

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I have a Gitzo GH1780QR head that I like because it is pretty secure and it is a very light combination with my carbon Gitzo tripod that folds small.  I also have two plates which is enough as I only have one white lens with a foot (70-200 2.8 IS II).  I want to ditch my 7D neck strap and go with a sling, but want to avoid screwing/unscrewing the connector to use the tripod.  I happen to have a second Gitzo head that I replaced because it doesn't have a separate pan lock, and the ball lock was a bit small.  I'm thinking of removing the clamp from the head, drilling out one of the 3 small mounting holes and treading it to accept a Black Rapid FastenR.

Because the Gitzo plate can engage the clamp in all 4 directions, the clamp can align with the camera body instead of projecting into your face like some of the Arca-swiss type clamps do when used with a sling (at least it looks like it would - no experience with it).  It also has the nice double lock system so I would feel secure with that.  The only worry I have is that the plate has a pretty small foot print and I wonder if the torque from the body/lens bouncing off my hip would be enough to make it spin and consequently loosen the screw in the bottom of the camera.

Just trying to make use of the parts I already have, but don't want to risk the camera gear.  Anyone have experience using the Gitzo GS5370C style plate with a sling, or just general experience with slings attached to a QR system to know if this is a risk?   

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I just got FoCal Pro to run through my lenses on a 7D and the most disappointing part was when I ran out of lenses and tests to run, it is some great software.

The manual states that the QoF numbers are not comparable from lens to lens, but if the lenses are run through back to back with the same lighting, target print, etc, would you you be able to compare your own lenses?  Reason being, I'm looking for my best lens to do some panoramic stitching on an upcoming trip and want to get the best combination of image quality vs number of frames required.  My 35L scored just under 1900 @f5, 24-105 @ 24mm scored just under 1600 @f5, and 10-22 set to 18mm scored about 1430 @ f5.6 and 6.3. (the 10-22 was the biggest beneficiary of FoCal, needing -7 AFMA at both ends of the zoom)

I was leaning toward to 35L before the testing because of best distortion control, but on a 7D I may end up doing two rows of pictures to get enough sky/foreground.  If the numbers above mean anything, then two rows of landscape instead of a single row of portrait on the 35 might be the way to go, but capturing evening light over water the lighting will change quite rapidly near the equator and speed might be more important that ultimate image quality.

I haven't picked the pano software yet, but it looks like they are all pretty good at correcting distortion, but at image quality price I'm sure.  I'm hoping to get at least one large print worthy image of the family sailing vacation.  A location portrait with the family to be found in it somewhere, rather than the typical family shot over the fireplace.

Any advice welcome.

Thanks

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Lenses / 70-200 f2.8II + 2xIII on 7D vs 300 f4 + 2xIII on 5D3
« on: February 02, 2013, 02:54:26 PM »
I currently use a 70-200 2.8 IS II + 2xIII with my 7D when the reach is required.  This is maybe 10% of the time I use that lens at most and is why I went that route.  When I do need the equivalent 640mm, it is for shooting my 4 children all involved in water sports (human powered, so focus speed not as much of an issue).  With that range I still need to crop some times, but as I'm a hobbiest the long range superteles are not justified, and stand out to my wife as obviously being very expensive.  Once the kids are at a more competitive level I may rent once in a while for fun. 

I would love to upgrade to a 5DIII this summer, but the 600mm focal length gets very expensive in FF, with the exception of the 300 f4 when I already have the 2xIII.  Virtually everyone on here seems to say once you go 5DIII or 1DX the 7D collects dust.  I could not justify keeping it and would sell it and the only EF-S lens, the 10-22.

Now lots of people love the 300 f4, but it gets bashed when discussing using it with 2x.  However, I think the bashing isn't completely justified, it is being compared to more expensive lenses.  When I compare the ISO 12233 against the Sigma 120-300 2.8 that is 3 times the price, the Sigma is only comparable in the center with or without converters, for example.

On the ISO 12233 charts the 24-105 can be compared between a 60D and FF, the lenses in question can not.  Obviously it is not as sharp on a 60D/7D sensor.

So the question is, even though the 70-200 combination will get the best image to the image circle, will capturing that image on the 7D sensor degrade it enough to be about equal to the 300 f4 combination image captured on the 5DIII sensor.  Equal image at almost equal focal distance, and hence still relatively equal cropping ability.

I'm hoping to benifit from the obvious upgrade for 90% of use without loosing quality at 600 mm with the suggested option.

WOW, that took way more words than I thought it would! 

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