All Forum Comments
Comment by Anvh posted on and after 16-50? at 17/07/2010 - 14:50
Oggy I don't see a difference at all.
These are at f/11, could you tell me where the difference is?
I can't even tell them apart
These are at f/11, could you tell me where the difference is?
I can't even tell them apart
Comment by Anvh posted on and after 16-50? at 17/07/2010 - 14:33
amoringello wrote:
Is less than 30sec per exposure good for stacking of night time photos?
I might be trying to get star rails in the next week or so, but am not going to sit through dark frame subtraction of fifteen minutes to two hours! I'd like to use the K7, but will likely have to fall back to the K10 unless stacking is useful. I just thought there probably would not be enough light captured in under 30 seconds to even make stacking worthwhile.
There are several ways you can stack.Is less than 30sec per exposure good for stacking of night time photos?
I might be trying to get star rails in the next week or so, but am not going to sit through dark frame subtraction of fifteen minutes to two hours! I'd like to use the K7, but will likely have to fall back to the K10 unless stacking is useful. I just thought there probably would not be enough light captured in under 30 seconds to even make stacking worthwhile.
With exposure stacking you actually add exposure, so 2 shots of 30 seconds give you the same result as one shot of 1 minute.
Also for the star trails the brightness of them will stay the same only the length change of them with longer exposures.
http://www.tawbaware.com/imgstack.htm
Comment by Anvh posted on K-x Bulb mode write-time slow? at 17/07/2010 - 11:47
johnriley wrote:
Dredging up a few snippets from memory, I think CMOS sensors are noisier than CCDs. Maybe it's because the amplification occurs on the chip and is less effective.
Almost right.Dredging up a few snippets from memory, I think CMOS sensors are noisier than CCDs. Maybe it's because the amplification occurs on the chip and is less effective.
CMOS use several amplifiers so you have amplifiers mismatches, this why they aren't as uniform as CCD.
Comment by Anvh posted on K-x Bulb mode write-time slow? at 17/07/2010 - 11:36
MrCynical wrote:
I have the non-WR version of the DFA 100 Macro - I love the bokeh on it (the WR has 9-bladed aperture so its will be any better)
Actually the rounded blade does nothing concerning the Bokeh but it does make the highlight circle of confusions rounder if not shooting wide open.I have the non-WR version of the DFA 100 Macro - I love the bokeh on it (the WR has 9-bladed aperture so its will be any better)
tripclito wrote:
i like take portrait and street, i saw many shot with long tele very nice..i love this kind of dof, and i like lens with nice boken, so what can you suggestion??
i handled just for few shot the 50 135.. the af is not fast.
i saw some shot with 100wr macro and other for insect and flowers is amazing with people as well!
If you want WR then your only options arei like take portrait and street, i saw many shot with long tele very nice..i love this kind of dof, and i like lens with nice boken, so what can you suggestion??
i handled just for few shot the 50 135.. the af is not fast.
i saw some shot with 100wr macro and other for insect and flowers is amazing with people as well!
DA*55 f/1.4
DA*50-135 f/2.8
DA*60-250 f/4
DA50-200 WR
DFA100 f2.8 WR
Off these lenses I would indeed suggest the DA*50-135 as the best one for what you want to do, because of the focal length and the f/2.8. The AF is slow because you have a longer focus throw meaning easier manual focus. I have the DFA100 and used it for portrait before I got the DA* but it's simply too long sometimes, a shorter lens like the DA70 or FA77 would be better.
Some members here have had the DA*50-135 and the DA*60-250 so they can give you a good comparison.
If you don't need WR then these are good options.
DA70 limited
FA77 limited
Sigma 50-150 f/2.8
Comment by Anvh posted on and after 16-50? at 17/07/2010 - 11:31
It's probably Pentax decision because they found the fixed pattern noise too high in some cases.
CCD are more uniform, maybe that has something to do with it?
CCD are more uniform, maybe that has something to do with it?
Comment by Anvh posted on K-x Bulb mode write-time slow? at 16/07/2010 - 23:48
I've no idea either why.
CMOS don't get as hot as CCD and you can shoot film with them over 30 seconds without a problem and without a dark frame.
CMOS don't get as hot as CCD and you can shoot film with them over 30 seconds without a problem and without a dark frame.
Comment by Anvh posted on K-x Bulb mode write-time slow? at 16/07/2010 - 23:29
Good one Mike, didn't saw that one
Comment by Anvh posted on New Optio I-10 at 16/07/2010 - 23:04
pink wrote:
ok I'm lost what is the theme? of this comp
The number 6ok I'm lost what is the theme? of this comp
So a shot of a 6 or get 6 subjects/objects on the photo.
You can look at the current entries are look at the first weekly competition that has the same theme.
https://www.pentaxuser.com/forum/topic/weekly-competition---the-number-six
Comment by Anvh posted on Comments Voting Competition # 0 (test run) - The Number Six at 16/07/2010 - 22:58
Okay will try to enter one, if I can think off something
Makes me think off this photo link
Yes old photos are allowed, I said there wasn't a date limitation for this one.
Pentaxophile wrote:
I was going to shoot some eggs and bought half a dozen especially for the comp, but I get back tonight and whats for tea? That's right - Spanish omelette!
I was going to shoot some eggs and bought half a dozen especially for the comp, but I get back tonight and whats for tea? That's right - Spanish omelette!
Makes me think off this photo link
Gwyn wrote:
Inspiration (and inclination :wink seems to have taken a holiday at the moment, but I'll see if I can come up with something. Are old photos allowed?
Hopefully you can come up with something, I'm curious what you can come up with. Inspiration (and inclination :wink seems to have taken a holiday at the moment, but I'll see if I can come up with something. Are old photos allowed?
Yes old photos are allowed, I said there wasn't a date limitation for this one.
TOZZA27 wrote:
Well I`ve taken one especially for Stefan
Thank you Tony, let's wait and see how many vote it will get in the end. Well I`ve taken one especially for Stefan
Comment by Anvh posted on Comments Voting Competition # 0 (test run) - The Number Six at 16/07/2010 - 20:35
If you mean the difference is visible with those led lamps then you're indeed right but the bokeh is the same even with those shots because the DFA100 has enough blades already so only the shape of the CoC is different and sadly that helps only a little bit with rendering the out of focus area better.
Only when you've highlights like those led lamps you might favour the WR photo for normal shots like the flower photos you need to look very good at full size to spot slight differences.
Not to talk the DFA100 WR down, I would love one for the build quality alone but if you already have a DFA100 I don't think it's worth the upgrade for the rounded blades alone.