Comments made by johnriley - Page 705

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I think it's clear that those who can perceive a difference will be interested in the K-5IIs, those who can't won't.

There's no point continually repeating the same things - interested parties will judge for themselves, which is why pictures are posted.

Comment by johnriley posted on K-5IIs - more discussion at 04/03/2013 - 02:37

The SMC version of the 135mm f/2.5 would be a contender, as would the 100mm or 105mm f/2.8. Not the 120mm, which is deliberately soft wide open, being designed for portraits.

There is a 28mm f/2 and also there is a 35mm f/2 which should fit the bill.

The trouble is some of these are relatively rare and may be quite expensive.

Comment by johnriley posted on Sharp wide open? at 03/03/2013 - 23:42

The latest AP has a test of 70-200mm f/2.8 lenses. This suggests that the Tamron lens is rather better than the Sigma. No equivalent Pentax lens of course.

Comment by johnriley posted on Sigma or Pentax !!! at 03/03/2013 - 23:38

Thanks CMW!

Comment by johnriley posted on PENTAX Image sensor cleaning kit O-ICK1 at 03/03/2013 - 21:38

Quote:
I'm not suggesting this falls into that category

Definitely not in this case - Pec Pads and Sensor Swabs are from the same manufacturer. Pec Pads are for lenses, Sensor Swabs for sensors, and they do tell us why.

What you say about alternative products can be true, but of course also often isn't and we, the consumer, have no way to know the difference apart from the repuitation of the source.

Comment by johnriley posted on PENTAX Image sensor cleaning kit O-ICK1 at 03/03/2013 - 21:15

Nonetheless David, it's surely prudent to use the right products for such a critical part? Is there a point in ignoring the advice of the manufacturer and not using the product they make for the job?

But the bit I was really concerned about was the solution stripping the sensor coatings. In the case of Nikon sensors we would need to use Eclipse E2 fluid. Does this also apply to Pentax sensors? Do we know?

Comment by johnriley posted on PENTAX Image sensor cleaning kit O-ICK1 at 03/03/2013 - 21:04

I've corrected your link, which now works. Unfortunately it doesn't mention E2 fluid, but it does say the following:

Quote:
PEC*PADs are not recommended for cleaning the CCD. PEC*PADs are not made from the same materials that are used in SENSOR SWABS. SENSOR SWABS are manufactured and sealed in a clean and sterile environment; therefore, the swabs are the ultimate in purity. Photographic Solutions does not approve the use of PEC*PADs on sensors; therefore, we will not warranty the CCD or any camera part from any damage caused by using non approved products.

The research continues.

Comment by johnriley posted on PENTAX Image sensor cleaning kit O-ICK1 at 03/03/2013 - 20:49

A bit of research indicates that Eclipse E2 fluid should be used with Tin Oxide coated sensors. Now all we need to know is if Pentax use TI sensors.

Also, Wex and BH both suggest using sensor swabs rather than Pec Pads.

There are also warnings about picking up muck from around the sensor if using Arctic Butterfly.

Comment by johnriley posted on PENTAX Image sensor cleaning kit O-ICK1 at 03/03/2013 - 19:27

The camera can be set to half stop or one-third stop increments and the exposure compensation can be set to match the ISO steps. Perhaps you have changed a setting?

6.3, 6.7, 8. 9.5 are approximately half stop steps.

Comment by johnriley posted on Aperture has changed all of a sudden at 03/03/2013 - 16:46

Good idea Ken, something to keep an eye open for.

Comment by johnriley posted on Genuine Pentax batteries at £0.99 at 03/03/2013 - 16:00

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