Anvh

Joined: 4th July 2008

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Anvh
Thank you for the great judging and for giving me the third place of all those other splendid photos
Congratz to Dan, a superb shot and glad to see you still alive from the adventure on the front of the train

Up to the next round.
Hurry up Dan, I want to shoot some photo
Oops you already have it up

Comment by Anvh posted on Fortnightly Competition # 18 "Movement" at 25/06/2009 - 13:04

Anvh
You focused on the L... what do you mean?

Here is something for you to play with link
Hyperfocal distance is an important one in landscapes.
It to were you need to focus to get infinite (horizon) and most of the biggest overlap of DOF with the rest of the frame.

With 12mm, f/22 the Hyperfocal distance is 33cm, so everything from 16.5 cm of you and the rest should be sharp then.

The patch of grass looks 3meter away so every aperture should have worked with the photo.

f/8 the top of the lens at 12mm the Hyperfocal distance is 91cm. If you set the focus on that everything 45.6 cm to infinite is in the DOF so should be sharp.
F/22 is really to much for such wide lenses.

Do keep in ind that the Dof decreas with the focal length so 24mm at f/8 has a HD of 362cm resulting in a focus field of 181.1 cm till infinite.
So if you double the focal length 2x the rest will be 4x, 3x the focal length 9x, 4x focal length 32x.
I forgot the name of this but it has to do with square root

Is there a simple rule of finding the Hyperfocal distance btw?

Comment by Anvh posted on newbie question: DOF in landscapes at 24/06/2009 - 21:19

Anvh
cedricd wrote:
Stefan, I have just tested the continuity of the contacts on the 2 X TC. Not all have continuous connections and one connects to two contacts.

Cedric
The PZ (sdm) contacts, the two golden ones in the mount must be working, the SDM signal goes over that.

The camera gets information from the lens, so the lens tells the camera that it has SDM, then your camera wouldn't use the screw-drive it normally use but use the SDM only.
If you put on SDM lens on your camera you of course want to use that instead of the screw and using both shouldn't be smart so it logical only the SDM works then.

I've been runing with the thought of breaking the contact that gives the info of the lens to the camera but you've the problem that the Camera doens't do anything since it needs to read it's an AF lens.
Blocking the info contact wouldn't work.

Meter the PZ contacts and let us know what they do.
Since it says it's a PZ TC it should work with SDM so really strange...

Comment by Anvh posted on DA 300 + TC at 24/06/2009 - 20:54

Anvh
Very good but very expensive the Pentax 1.7
It has his own focus part so every lenses even old manual ones have auto focus.

Comment by Anvh posted on DA 300 + TC at 23/06/2009 - 21:42

Anvh
cedricd wrote:
Hi Stefan, thank you very much for your help. Yes it is the one in your picture. I tried it today in seriously bright sunlight and absolutely nothing happened.

Cedric
The one on the photo is the MC not the needed SHQ
It's very strange since you have the contacts needed, maybe they aren't connected correctly.

Might be worth screwing one open since most new lenses will be SDM only.

Comment by Anvh posted on DA 300 + TC at 23/06/2009 - 21:41

Anvh
Mike-P wrote:
Mike-P wrote:
STILL undecided whether to buy a 50-135mm or keep my Sigma 70-200mm f2.8 and converters.
Ah well, Park cameras have now put their 50-135mm price up so that sorts out that problem.
Price didn't went up here so maybe also not in Spain.
Here it is €709 (£609) not as cheap as it was in the UK but surely cheaper now after the price raise.

I really shouldn't buy a thing in the UK anymore if I was you.

Comment by Anvh posted on SRS new prices at 23/06/2009 - 18:55

Anvh
Mike-P wrote:
Anvh wrote:
Yes but you ain't sure Mike.
I'm sure enough to put money on it Stefan and I don't do that unless I'm guaranteed to make a profit
Too bad you said "£1100 in the UK" or else I would have taken the offer

Comment by Anvh posted on SRS new prices at 23/06/2009 - 18:13

Anvh
Hyram wrote:
gartmore wrote:
Are we looking at the last ever picture by Daniel Bridge?
Difficult to know how he survived that
He goes out with the shot of his life though

Comment by Anvh posted on COMMENTS - MOVEMENT Fortnightly Competition at 23/06/2009 - 18:11

Anvh
Lance B wrote:
Of course, this is a question only you can answer and I do not envy that choice.
Thank you Lance, if Pentax only had a longer zoom then the choice might be simpler but now.

Reubenm thank you for your comment.
Finally something positive

Do you've an example of how it renders?
I like what the DA*50-135 do on f/2.8, simply love it. The DA*60-250 is maybe more perfect but it miss some magic from what I've seen. How does the DA*200 do with that?

Comment by Anvh posted on DA*200 anyone? at 23/06/2009 - 18:09

Anvh
Yes but you ain't sure Mike.
It's all in the deal the shop can make with the supplier, if they can get it for a better price so that they can sell it by quite a margin under the advice price I don't see why they shouldn't do it.

Good they might make more profit per body but if they can sell more the overall profit might be better and althose people will also want a new lens over 2 months as well so if you supplied the K-7 cheap with good service they will probable come back to you.

I don't have a shop so can be wrong though

Btw, body only price I've seen here is €1049 (£900)

Comment by Anvh posted on SRS new prices at 23/06/2009 - 17:49

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