Algernon

Joined: 22nd May 2010

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Algernon
I herby certify myself sober!

Comment by Algernon posted on Another pointless thread at 24/05/2012 - 11:27

Algernon
You will need a bowl of water at the dev. temp. to keep the tank at the correct temp. For that reason a stainless steel tank is the best for heat transmission.

Most developers give times for 68degF and 75degF (+ degC equiv.)

I used to use 75degF for shorter dev. times, always in a
bowl of water at 75degF.

The developer goes off mostly due to oxidization so store it in
a plastic squeezey bottle or use a wine vacuum pump and stopper.

Powder chemicals are mixed to whatever working volume is given
on the pack i.e. 1 Litre 2.5 Litre etc.

Comment by Algernon posted on B&W developing help for a film newbie at 24/05/2012 - 09:22

Algernon
The one that sold recently on ebay for £575 was complete with hood and
bag..... sold to a dealer who hasn't left any feedback even though
the seller has? Ebay_Link

Comment by Algernon posted on WTB: Pentax Lens Hood for FA* 85mm f1.4 at 23/05/2012 - 17:05

Algernon
Pentaxophile wrote:
Anyway the 75mm EFL on APSC can't be that useless... or else why do we have the 77mm ltd
It's because it's a Lucky Number in Japan and also partly because the Chinese character for "delight" looks like "77"

Comment by Algernon posted on Changing Thoughts on Lenses at 23/05/2012 - 16:51

Algernon
The bluebells look good I don't think it
likes red

Comment by Algernon posted on The VPK 72mm f6.8 Meniscus Achromat at 23/05/2012 - 16:42

Algernon
Either way works With a 2x Refconverter it's better
to focus on some lettering.

Comment by Algernon posted on Spectacles and Eyecups at 23/05/2012 - 14:48

Algernon
08tiger wrote:
These little guys have been busy munching on the grass seed.
That's no reason to throw RED paint at it

Nice shots!

Comment by Algernon posted on finch at 23/05/2012 - 10:06

Algernon
If BT hadn't chosen the wrong system for Caller ID a lot of
computer software could have been used. Most of it's available,
but just won't work on BT. i.e. software that pops up a picture
and says "Bob's Calling" etc. Some even pops up on your TV.

Comment by Algernon posted on Just had anoth phone call... at 23/05/2012 - 10:04

Algernon
Looks like they wish they had a garden I like the door

Comment by Algernon posted on Patriotism at 23/05/2012 - 09:57

Algernon
davidstorm wrote:
Algernon wrote:
Accurate manual focus on the K-5 at around 1M is impossible
I'm not sure what you mean by this Algi - I have no difficulty manually focusing my K-5 at any distances. I use it for Macro, Wildlife and all other manner of things where I focus manually. The viewfinder is good and there is a focus confirmation if you need it. Could you explain a little further what you mean?

Regards
David
It's well known that focusing accurately (at about 25x FL = Lens test distances)is not possible without using a focusing rack. link

At first I thought I would be OK focusing with magnified LV and then moving back and forth on a small Novoflex rack until I found the points fore and aft where the screen went in and out of focus, and then take the centre point, but it didn't change at all going +/- 60mm so I had to try it on the monster link which allows an enormous 15" of movement. I still had to move a long way for the LV image to go OOF.... the 3" screen resolution must not be good enough. That was still a bit messy

What I do now (for lens testing) using a laptop and Eye-Fi card is focus with magnified LV. Put masking tape on the lens focus ring to stop it moving. Take a shot. Take further shots with the rack moved back and forth +40mm +20mm -20mm -40mm.

Pick the best shot say +20mm and then take a further 3/4 shots bracketed in 10mm increments for each aperture either side of +20mm. Pick the best for final comparison. This also picks up any errors due to focus shift on stopping down.

It sounds a lot but it's actually fairly quick because I only focus the lens once for the whole test and then it's just a case of quickly turning the knob on the focus rack and taking each shot.

The distances +40mm +20mm -20mm -40mm aren't really that critical what matters is that the camera is moved a bit between shots. The target could be moved instead which means a focus rack is not required.

Comment by Algernon posted on Pentax Ricoh future at 23/05/2012 - 09:45

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