Comments made by johnriley - Page 314

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You could buy it or a later version of it on eBay perhaps?

However, I'd go for one of the Pentax/Ricoh WG waterproof/shockproof series. Then the water and the weather will never be an obstacle.

Comment by johnriley posted on What to replace my Optio M20? at 19/01/2015 - 18:13

No news as yet, but I think there may well be an ongoing series of minor tweaks and improvements.

Comment by johnriley posted on Is it my imagination or did we used to have "no. of views" for posts? at 19/01/2015 - 18:11

Maybe a general service is due then?

Comment by johnriley posted on Repairs to non digital Pentax models at 19/01/2015 - 13:59

Maybe it's too cold for the camera and that's all that's wrong. I have a feeling they are rated to operate from 0C to 50C, and the lubricants probably haven't been replaced for many years. Is it OK when warmed up?

Mechanical cameras used to be sent to be "winterised" when sub zero climes were to be visited. This involved replacing all the lubricants with a different grade.

Comment by johnriley posted on Repairs to non digital Pentax models at 19/01/2015 - 13:03

The easy example is a 50mm lens with 25mm aperture. 50/25 = 2 or in other words it's an f/2 lens.

Now add a 2x converter so 100mm focal length and therefore 100/25 = 4 and it's now an f/4 lens.

1.4x converter = 1 stop difference
2x converter = 2 stops difference

The exposure does change accordingly, but the beauty of it all is that the focusing distance remains the same, the magnification has increased. Great for close up work.

Comment by johnriley posted on HD Pentax-DA AF Rear Converter 1.4x AW at 19/01/2015 - 12:58

Unfortunately I don't use the Pentax software, so I can't help with that one.

Comment by johnriley posted on HD Pentax-DA AF Rear Converter 1.4x AW at 19/01/2015 - 10:20

The EXIF is interesting. It reports the main lens without mention of the converter, not surprising perhaps as it could become a very long description. It reports the correct focal length, so the lens set on 300mm reports a focal length of 420mm.

It also reports the correct actual aperture, so the lens set on f/5.8 reports f/8, which is as close as it can be.

All in all it seems well thought out.

Comment by johnriley posted on HD Pentax-DA AF Rear Converter 1.4x AW at 19/01/2015 - 10:06

Very nice indeed.

Comment by johnriley posted on Fungi at 19/01/2015 - 09:08

I've looked at the audit trail and there are no missing posts in this thread, so I can only p[resume there's another thread on the same subject, or that's crossed over into the same subject.

Comment by johnriley posted on Laptop help needed at 18/01/2015 - 23:04

We tend to hear all about failures, but since the problem was tackled we haven't heard a peep on this forum. That's all we can judge by.

I recall Canon actually had to withdraw a lens completely because of various faults.

Comment by johnriley posted on DA*300mm focusing problem again! at 18/01/2015 - 20:38

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