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Forum: Pentax DSLR Discussion 07-09-2008, 08:54 PM  
How to use 1000x Neutral Density filter with DSLR
Posted By Thule
Replies: 23
Views: 9,818
this one I did not know, does the view finder really leak so much light in?
And yes I can see through it but barely. But anyway the only problem I seem to have is the correct exposure time. Have to experiment with the bulb mode.
Forum: Pentax DSLR Discussion 07-09-2008, 11:33 AM  
How to use 1000x Neutral Density filter with DSLR
Posted By Thule
Replies: 23
Views: 9,818
full details:

B+W 67 110 ND 3.0 - 10 BL 1000x

uhhh, hopefully not a totall overkill

> So if you're getting a 1/1000 reading with no filter,
> mount the filter and expose for 1 second and that should be correct.
> But if you're metering 1/30, then with the filter, you'll need a 30-second exposure.

The strange thing was that without the filter the camera metered 1/250s exposure time. I used manual mode + attached the filter -> camera calculated 20s ( 1/250 x 1000 ~ about 20s) and still just (nearly) black image.

hmm, have to try again but need to wait for the next sunny day.....
Forum: Pentax DSLR Discussion 07-09-2008, 10:59 AM  
How to use 1000x Neutral Density filter with DSLR
Posted By Thule
Replies: 23
Views: 9,818
Recently purchased 1000x B+W ND filter. Intention was to use really really long shutter times.

All pictures I get with this are completely black obviously because the K10D calculaets too short shutter time.

One attempt was on a sunny day, manual focus to infinity and with aperture priority (F4.0, ISO400) the K10D calculated 20s shutter time -> still the picture was just black (nearly).

The max. shutter time with K10D is 30s and still this does not seem to suffice?
How bright environment is really needed for this kind of filter? Or for landscapes should the bulb mode be used for something like 120s?
Forum: Pentax SLR Lens Discussion 04-15-2008, 09:32 AM  
About Fa 43mm ltd
Posted By Thule
Replies: 430
Views: 88,367
Thanks for all for the info. I think I should find a local dealer to test the 50mm f/1,4 with my K10D.

btw: would anybody happen to know any site for Pentax 50mm f/2,8 Macro MTF graph?
Forum: Pentax SLR Lens Discussion 04-14-2008, 11:34 AM  
About Fa 43mm ltd
Posted By Thule
Replies: 430
Views: 88,367
I'm looking for a sharp prime lens between 40mm and 50mm.
Currently I have Pentax FA 16-45mm f/4 which is quite nice but not as sharp as I would like.

Two candidates in my mind:

- Pentax FA 50mm f/1,4
- Pentax FA 43mm f/1,9 Limited

The 50mm is generally considered as a very good performer and also the 43mm f/1,9.
But what got me puzzled was these resolution graphs, according to these graphs the 16-45 has excellent resolution, at some focal lengths on par with 50mm or 43mm versions?
So is there any need for me to get 50mm or 43mm if the 16-45mm is already very sharp (according to these graphs)?


Short summaries:


Pentax FA 16-45mm f/4

Pentax SMC-DA 16-45mm f/4 ED AL - Review / Test Report

photozone:


Pentax Lens: Zooms - Pentax 16-45mm f/4 ED AL SMC P-DA - SLRgear.com!
Pentax DA 16-45mm 1:4 ED/AL Lens Review: 3. Test results: Digital Photography Review



Pentax FA 50mm f/1,4


photozone:

Pentax Lens Review Database - 50mm F1.4
Pentax Lens: Primes - Pentax 50mm f/1.4 SMC P-FA - SLRgear.com!


Pentax FA 43mm f/1,9 Limited


Pentax Lens Review Database - 43mm F1.9 Limited

photozone:

Pentax SMC-FA 43mm f/1.9 Limited Review / Test Report

Pentax Lens: Primes - Pentax 43mm f/1.9 Limited SMC P-FA (Tested) - SLRgear.com!


I'd be very interested to hear if somebody has used or tested these lenses,
do the 50mm and 43mm outperform the 16-45mm in terms of sharpness
if stopped down properly?

Or should I consider the Pentax 50mm f/2.8 Macro which I heard to be the sharpest 50mm Pentax lens ever ...... :confused:
Forum: Photographic Technique 03-20-2008, 10:11 PM  
K10D & Northern lights
Posted By Thule
Replies: 17
Views: 5,649
Very nice pictures in Duplo's gallery!

In my case the air was very clean and clear, in Lapland near the arctic circle and temperature around -20 Celsius ( -4 Fahrenheit ). The lens was at f/4, but I noticed that others used ISO 100 so I guess that was my mistake here.

But I still don't understand that if I use the highest ISO 1600 and 60s exposure time and f/4, the original RAW image was all black to human eye (before photoshop)?

Well I have to wait for the next time, I will try with ISO 100 and 60s - 120s exposure times, let's see what happens.

one more shot from that day :lol:
Forum: Photographic Technique 03-20-2008, 02:08 PM  
K10D & Northern lights
Posted By Thule
Replies: 17
Views: 5,649
Where can I find those pics? I would be interested which lens was used and what camera settings?
Forum: Photographic Technique 03-20-2008, 01:41 PM  
K10D & Northern lights
Posted By Thule
Replies: 17
Views: 5,649
Here is another sample, not night yet. But you can clearly see that with about 30s exposure with ISO 100 there are even some stars visible.
Forum: Photographic Technique 03-20-2008, 01:27 PM  
K10D & Northern lights
Posted By Thule
Replies: 17
Views: 5,649
Tried that also, no luck. I also tried ISO 800 + 30s exposure / 60s exposure, about same result.

It was about -20 Celcius, sky was pitch black with thousands of stars blinking, the n-lights were razor sharp and bright moving very swiftly .... and all I was able to shoot was this :mad:

The lens should be quite ok I guess?
Forum: Photographic Technique 03-20-2008, 01:16 PM  
K10D & Northern lights
Posted By Thule
Replies: 17
Views: 5,649
Hi all,

I was disappointed to notice how low quality pictures of northern lights I was able to get with K10D + Pentax SMC-DA 16-45/4. I used ISO 800 and 1600 + bulb mode -> about 60s exposure.

Sample picture attached <-> very heavily adjusted in photoshop to actually see anything. The original picture was all back :(

Has anybody been succesfull with K10D and northern lights? Which lens are you using and what camera settings?
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