petrochemist

Lives in United Kingdom United Kingdom
Joined on Feb 26, 2014

petrochemist's recent activity

  • The difference is even the larger sensors in phones (& compacts) are generally pretty small. I sensor size is important to your shooting you wouldn't normally make use of these styles of cameras.
  • The electronic control requirements of the EF mount make Canon lenses a bad choice  for adapting IMO. It would be possible to make such a setup powering the lenses IS, and having a couple of ...
  • There is a partial mirror sending some light to the AF system, and another sending some to the metering system (until the shot it taken) I don't think fog ever gets thick enough to block that much ...
  • You might be surprised, when I first looked at thermal cameras I found that the USA couldn't export them to the UK for legal reasons! The seller concerned did ship other items to the UK and we're ...
  • I've got two used models in PK mount. Both of mine were very much cheaper than the Kenko version I think the Jessops one came out about £5. and the earlier purchase was about £20. You get ...
  • I've used mine for motor sports, but the movement on track is generally more predictable. Most of the results came out OK using pre-focus techniques, but I did find that when one of the riders ...
  • I've tested transmission of a few possible lenses using a spectrometer at work (set up for liquid samples rather than lenses but it gives an indication) Three of those I've checked look promising ...
  • If weight is an issue then I'd recommend one of the better mirrors - the Tamron SP500 (Adaptal2) consistently reviews well & can be adapted to just about any mount. If you shoot from inside the ...
  • Cheaper options are rubbish compared to those you can't afford. AF & IS are both great advantages on such long lenses & new lenses will typically be sharper, have less aberrations. But if you ...
  • It could be the adapter has been made slightly too long - this was a common issue with early M42 adapters and can still be the case with a few. If you can measure the distance between the M42 ...
  • My 14 year old K100d can't use ISO values below 200. It's 6MP results were generally good to A4 (10x8) and noise was passable at ISO 800. Even with this there were times when higher ISO setting ...
  • I'm no expert on sharpening, but all the tutorials I've watched have pointed out how you need to even up the usage of wetstones & redress them regularly because they are soft & rapidly get ridges. ...
  • My budget arca compatible L plates were less than 10% of your 'good quality' ones. I've not yet found any way that they fail to meet my requirements. Perhaps if I hit them with a sledge hammer ...
  • The importance of shimming depends to a great extent on the focal length of the adapted lenses being used. For a while the only A-mount lens I had was a 10mm/2.8. The adapter i got to use this was ...
  • i don't think so. Several adapters have a small ridge under the bayonet tabs which can be included by mistake, some have needed multiple measurements added subtracted to get what seems to be the ...
  • Indeed it is, I use cameras with 5 different mounts, lenses with ~20 mounts, and have some special adapters (techart, focal reducer, shift, tilt...) that I want to use on multiple lens types  ...
  • Here's the first lot of mine the adapters on my desk & two easily grabbed cases. Some aren't traditional mount adapters but I use them for joining adaptors :) Finding all the others will take a ...
  • I've measured a few of mine, but I guess it would be useful to do them all. Hopefully make a start tomorrow as I have a boxful on my desk :)
  • There are similar commercial designs but DIY is an easy option if you have suitable bolts & a drill. I've never gone that route as I carry far too much kit already! If your Ball head is a smaller ...
  • I generally find something like a bean bag is quite adequate, even just resting my camera on a coat, or my bag. If you need better control of how the camera faces, a ball head can be fitted to ...
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Total messages 2497
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Last post 11 hours ago
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Last post Oct 29, 2017
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