jeanphilippe Goube

jeanphilippe Goube

Lives in France Toulouse/France, France
Works as a Aerospace Engineer
Joined on Aug 17, 2007
About me:

Love wildlife, dogs, horses
Good wines, fine chocolates
Old timer railways

jeanphilippe Goube's recent activity

  • Created discussions Fa*300 on sale on ebay
    I spotted out this rare lens on sale on ebay http://www.ebay.fr/itm/Rare-Pentax-FA-300-f2-8-super-tele-/171550513521?ssPageName=ADME:L:LCA:FR:1123
  • Actually Samsung makes a lot of profits in smartphones - even more than apple, I think. I don't see Sony having such cowmilks. Lot of activities but a few where they are leaders.
  • Quantum efficiency of the K3 is around 50 %, ie one photon over two hitting the cell produces an electron. If backlit sensor allows to be near 100 % there is one stop of improvement. But no room ...
  • Backlit sensor is not  a Samsung patent, NX1 is only the first application of  backlit to an APS-C sensor. I don't see why Sony wouldn't use it in future sensor released
  • That's why I use a camo cover all the time. Like this one : http://www.jama.fr/boutique/en/shooting/rain-protection-for-cameras-and-lenses-43/cover-rain-protection-wildlife-218/caplens-l55cm-d19cm-131
  • Replied in jpg & Holger
    For mammals, the noise of the screw drive can be very disturbing. More disturbing than for birds. Mammals usually have a less developped view than birds, but are very sensitive to noise and smell. ...
  • I see; I have tried also this ballhead, but the result was not good. To weak. On th epicture you can see the arka swiss on the second FA*600, on the right, suitable with the wimberley head. Nice ...
  • Beware, it is not the correct arka swiss plate. The correct one is much longer, and is screwed with 3 bolds. For the bird pictures; they are OK, you'll not have good results - with any lens - if ...
  • I have the WR 2 version, it is a good product. I wonder what they have improved on the version 3 ? The AF/MF clutch has been fixed here, with another issue with the little pins on the bayonet, it ...
  • There is a new 80-200 or 70-210 f2.8 to be released soon - prototype was shown at photokina. It will be WR and DC, and HD. I'll wait for it.
  • Congratulations ! I must warn you, cause of the weight and size of the lens, you'll have to plan - as I did - some more investment to be able to use it. A tripod and a wimberley ballhead, a strong ...
  • I was desperated by the K7 above 400 iso... I'm using the camera for birding with high end lenses - ie FA*600 f4, FA*300 f2.8 - and I must say, sharpness decreases a lot - at the pixel level - as ...
  • I never go beyond 1250 iso, I'm very demanding on image quality - not a question of noise, but color rendering and dynamic. Anyway a backlit sensor improves photon to electron convertion ratio and ...
  • That's the first implementation of a backlit sensor on an APS-C. Previously backlit was reserved to smaller sensors. Nice to see that APS-C has still room for improvements ;)
  • Cause at high iso, there is noise reduction to apply (in jpeg mode) and as there is more noise, compression methods (both in jpeg and raw) are less efficient, resulting in larger image and slower ...
  • Thanks Mark, indeed it is the FA*600 with the new Pentax TC. This combo works fine
  • I offer this very rare item for sale; it is optically mint; cosmetically the silver finish of these lenses is easily scrated and it is the case for this lens, on the lens Hood there are scrates ...
  • Created discussions Birding; FA*600 and FA*300
    It's a while since my last thread here. Here are some of my best pictures from the past months. Enjoy Lapwing wagtail Zitting Cisticola Stork Dunlin Greb Common snipe
  • I'm not sure; the 600 is a lens for hides; it is so heavy for trekking. I think you have made all your shots handheld
  • Gorgeous pictures ! I'm planning a trip to kruger NP next year.
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