Why I’m cancelling my Tesco credit card

Taking money out of a cashpoint machine on a credit card is something I would never do, so I tend not to read the terms and conditions that apply to doing so. It’s just something that wouldn’t happen, so I don’t worry about it. Recently however my wife took out some cash against our Tesco credit card unintentionally and as a result I found out quite how unpleasant the situation is if you do. Here’s what happened.

The first bill I received after it happened, there were charges for interest applied. There was no explanation as to how these arose or were calculated, but after spending quite some time on the phone waiting for Tesco’s staff to answer it was explained that one was interest on the cash being taken, and the other was interest on the fee for using the service of taking cash out against the card. I’m not entirely happy about the idea of being charged interest on the latter, but it wasn’t a huge amount and I paid the whole lot off on time thinking that would be the end of it. Lesson learned and all that.

However, the next bill also had charges for interest and no explanation of their origin, so I spent another happy hour on the phone (you know I’m not telling the truth there, don’t you?) waiting for Tesco to answer. It was then explained to me by the woman I eventually spoke to that these were interest charges for the time between the statement being generated and them receiving payment.

Now that confused me. I’d paid the bill on time. Why was I being charged interest? Because there were a number of days between the statement date and me paying, and those days accrue further interest, apparently. I was mildly surprised and inquired as to whether I understood correctly that even if I paid the bill in full on the day I received the bill I would still be charged interest and that there was no way to get out of that situation? Only if I pay on the day the statement is produced (that is, before I even know the statement is actually on its way), apparently, or if I call and find out how much is due at the time I call and pay there and then.

Whilst I accept that those are the rules and will pay to clear the debt owed, I suggested that this absolutely reeks of grubbing every last little penny out of the situation in as underhand a way as possible, but the woman just kept saying “That’s the way everyone does it”. And therein lies my problem. “Everyone does it” is not a reason. It’s an excuse. It’s hiding behind mummy’s skirts because you just don’t have the balls to come out and say “Actually, this isn’t a reasonable way to behave”. It’s a clear attempt to trap people in a never-ending spiral of interest payments and, frankly, it stinks. If I were late paying the bill, or didn’t pay it all off then I could accept further interest charges, but not if I pay by the due date, and especially not when I can’t avoid them even if I pay on the day I receive the bill.

So, Tesco, as soon as I have another credit card sorted out, you’re going to lose our business. And not just our credit card business either. We used to spend an awful lot on food with Tesco. That isn’t be happening any more. I’m sure they won’t care about losing our business. There are plenty more customers where we come from, I’m sure. But there are plenty more banks and supermarkets too, and from now on we shall be taking our money elsewhere.

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Keeping recordings and DVB channels when moving MythTV

Thanks to a server dying I’ve been moving my MythTV installation to a new system. I wanted to install from scratch to clean out a load of old settings and other data that have been hanging around for years (I’ve been using MythTV since somewhere around v0.7), but to keep all my recordings and the tuner settings for my DVB-T cards.

I discovered that having copied the recordings across from the old server, running the following against the old database and importing into the new will extract all the recording data and recording schedules and can be imported into the new copy:

$ mysqldump -u mythtv -p mythconverg record recorded oldrecorded recordedprogram recordedrating recordedmarkup recordedseek > recordings.sql

And for the channel tuning data:

$ mysqldump -u mythtv -p mythconverg dtv_multiplex channel > channels.sql

Posted in Computing, Linux, MythTV | Leave a comment

Clearing BIOS RAID metadata for CentOS6 install

Today I was trying to install CentOS6 on a server put together from bits and pieces I had lying about. The CentOS installer would not include either of the disks I’d used because it claimed they had BIOS RAID metadata that didn’t appear to be part of an existing RAID partition.

Initially I tried using “dd” to write a load of zeros to the start of the disk to see if that would clear whatever information had been left on the disks from their previous life but no dice, so I had to do things the hard way…

Eventually I found that the following command (run for each disk device in turn) cleared the data and allowed me to use the disks for installing the OS:

dmraid -r -E /dev/sda

The easiest way I found to run it from the CentOS installer was to use Alt-F2 to flip to a shell once the GUI installer had started, run it there and then Alt-F7 to flip back to the installer screen.

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Comparison of JPEG and RAW White Light Solar Image Exposure Times

I almost didn’t post this because I can’t quite believe the results are so poor for the second image, but here it is. I’ll try again tomorrow if the weather holds out. A stack of 60 images, processed from RAW in PIPP, stacked in Registax v6 and finished in Photoshop. Identical processing other than the exposure time.

The first one is 1/1000th @ ISO100 which is what I normally use. This gives me a histogram peak about one third of the way across the graph in APT. The second is 1/320th @ ISO100, which I chose because it gave me a peak about two thirds of the way across.

To me, this second one looks out of focus but I didn’t touch anything but the APT controls between taking the two:

And a comparison of the sunspot area at the bottom left:

I don’t know if the brighter image caused Registax to have trouble aligning the frames, or if there’s some other processing issue, but clearly the 1/320th sec exposure image looks awful. I’ll post another test when I can do one, but on the the basis of this result I shall be keeping my histogram output well to the left.

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Comparison of JPEG and RAW White Light Solar Images

These two images were taken from the same imaging run, 60 of 120 images stacked, 1/1000th @ ISO100. The RAW files were processed with PIPP, but I couldn’t get Registax to process the TIFF files produced by PIPP from the JPEGs so I used the camera JPEG files directly. Both stacked in Registax v6 and finished off in Photoshop. I don’t think I need to hide which is which. It’s blindingly obvious…

First, the image from the RAW files:

and from the JPEGs:

And crops of the sunspots from the full size images:

I might try again, converting the JPEG to monochrome first, but I don’t think there’s any real comparison. The reduction in size of the JPEG in the full solar image clearly does it a lot of favours.

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Another wide field Andromeda Galaxy Attempt

Fresh from my previous attempt at this I repeated the process, but this time in the capture application (APT) I pushed the live view zoom up to 10x and set the emulated ISO setting to 1600 with an exposure as long as it would stand. I then adjusted the focus to minimize the size of the (few) stars that I could see. This resulted in a much better-focused image. So much better in fact that a small amount of star trailing is evident 🙁 Without drift aligning I think that’s probably to be expected, but I might try to fix it for next time. Overall I think it’s a much better image than the previous one.

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Widefield Andromeda Galaxy

This is the first time I’ve ever attempted this sort of image. I left the telescopes in the house for this one, just taking out the Canon 450D and 200mm f/2.8L lens on my unguided EQ3-2 mount. I shot ten images of four minutes exposure at ISO800 and f/4.5 together with five darks and stacked them all using Deep Sky Stacker, tweaking levels and curves in Photoshop. For a first attempt I guess it’s ok, but I really didn’t get the focus right and it shows. I’m pleased at least to have picked up the some indication of the dust lanes.

What really amazes me about this picture is that all the stars are actually in the Milky Way, so far closer than the three galaxies (M31, M32, M110) visible.

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Season of Mist and Mellow Fruitfulness

It seems that after a no-show Summer, Autumn is forcing its way onto the scene already. This was the scene from one of my windows a couple of days ago, first thing in the morning (look at the lengths of the shadows in the field). Sadly I didn’t have time to do it justice. I just had to get a quick picture with a compact camera.

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Solar Imaging with the 127 Mak

Someone was asking about the set-up of a solar imaging system, so I took these photos of mine “in action”. There’s really nothing special here other than the motor focuser that I cobbled onto the back of the Mak. The camera is a Canon 450D with a T2 adapter fitted straight to the visual back on the telescope. It has an external PSU and is controlled by a laptop using APT via a USB cable. The mount is my somewhat ancient EQ3-2 with dual axis motors. The solar filter is home-made, using Baader Solar Film.

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Stacking Canon RAW CR2 Files For Solar and Lunar Imaging

I use Deep Sky Stacker for stacking images from my 450D for wide field shots of the night sky, but I’ve struggled getting anything to work for solar and lunar images. Some people I’ve discussed it with have found no problems whilst others just haven’t been able to get it to work at all.

I was in the latter category and resorted to stacking the JPEG files produced by the camera rather than working from the RAW CR2 files which would always be my preference as the JPEG compression is lossy.

Initially I experimented with converting the CR2 files to TIFF using ImageMagick, but despite trying to stack those files with both versions 5 and 6 of Registax the stacking was very poor, and AutoStakkert 2 ran for ten hours without producing a usable result. Looking at the content of the TIFF files it appears that they contained a large amount of noise and I believe that to be the cause of the problem.

I then tried Canon’s DPP software which came with the camera. That can convert RAW images to TIFF in batch mode and appears to produce much cleaner files than ImageMagick. Again however all three stacking applications struggled to get anywhere, producing poor results.

Finally the author of PIPP suggested I try the new “almost-ready-for-release” version. It should read in the RAW files, crop them to a box just larger than the image and save them again as TIFF. I had a few niggles along the way but we got it to work fairly quickly and the resulting files now stack quite happily.

I intend to repeat this experiment when I next have the opportunity to do some solar imaging — the forecast is not looking good this week, but here are my results thus far. The processing is as far as possible the same except for the stacking, and all four images are taken from the same original imaging run. In the case of Registax, 54 frames were stacked in each case. I don’t know how many AS!2 chose to stack.

First, the result from using the JPEG files:

Then from the RAW files, preprocessed with PIPP and stacked with Registax v5:

And the same files stacked with Registax v6:

And finally stacked with AutoStakkert 2:

I think it’s a close call between the last two to decide which is best. I believe I can see a purple-ish “ghost” above the large dark sunspot towards the top left of the Sun in the last image though, so for the moment, for me, I think the third comes out marginally on top.

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