Comments made by Algernon - Page 167

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Now you know where the profit is

Comment by Algernon posted on Sort of lens related at 15/01/2015 - 08:31

It would probably be more cost effective for Pentax to BUY some FF cameras from Amazon and just give them to the people who say they need them

Remember how ITV nearly went bust getting involved with football. They could have probably flown the few subscribers they had to every match cheaper then screening them

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Comment by Algernon posted on Why Pentax needs full frame at 14/01/2015 - 18:47

Polaroid was the answer ........ Just reminded me I still have a 5x4 Polaroid back....
I wonder if it's worth selling ...... takes smaller film packs than 5x4.

Comment by Algernon posted on Studio Flash head units at 13/01/2015 - 12:35

It was actually a lot easer in the past. You just had a Guide No which you divided by the approx. distance and that was the aperture that you used.

Flashbulbs were similar and very powerful considering the size....
http://www.flashbulbs.com/flash_info.htm

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Comment by Algernon posted on Studio Flash head units at 13/01/2015 - 12:02

I don't think your talking about the same thing here. The lights and distance aren't changed... just the ISO on the camera from 100 to 200 ISO which gives an extra 1 Stop.

I've just confirmed this on the manual dial on an old Sunpak flash. Distance and ISO are on the outer dial and f stops on the inner. Move the ISO one stop and the distance 10 ft in this case moves to the next smaller f number = 1 stop

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Comment by Algernon posted on Studio Flash head units at 13/01/2015 - 08:47

Sorry I typed it wrong 200/100 = 2x = 1 stop

Comment by Algernon posted on Studio Flash head units at 11/01/2015 - 16:03

pentaxian450 wrote:

Blythman wrote:
doubling the ISO from 100 to 200, will effectively double their power.

Not quite. It will only "increase" the power by 1.41. To "double the power", you need to go to ISO 400.

You must have a faulty calculator

ISO's are linear 200/100 = 2 Stops

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Comment by Algernon posted on Studio Flash head units at 11/01/2015 - 15:16

jeallen01 wrote:

Algernon wrote:
Strange that given the number of people saying Pentax need full frame that non of them have done any simulated FF using stitched APS-C shots this can actually be better than FF if you crop off some of the soft edges. I doubt that any of them would even know how many shots would be needed to stitch a FF shot from APS-C

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My preference is for not a lot of post-processing because of the time it can take - and I'm not very good at it at all anyway!

Some panoramic software will automatically create panoramas from all suitable shots it finds in a directory that you point it at.

For anyone interested in simulating FF with a Pentax use portrait format take 3 No shots overlapping by 40% and stitch them. 28mm to 50mm lens should work OK.

40% overlap is quite big, but that's what the calcs work out at. Two shots won't quite be wide enough. You could go bigger than FF by giving the 3 shots 20% overlap.

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Comment by Algernon posted on Why Pentax needs full frame at 11/01/2015 - 13:30

Strange that given the number of people saying Pentax need full frame that non of them have done any simulated FF using stitched APS-C shots this can actually be better than FF if you crop off some of the soft edges. I doubt that any of them would even know how many shots would be needed to stitch a FF shot from APS-C

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Comment by Algernon posted on Why Pentax needs full frame at 11/01/2015 - 11:14

Film Tests on Pentax 35mm lenses...

http://www.takinami.com/yoshihiko/photo/lens_test/pentax_35.html

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Comment by Algernon posted on Help please with M42 Question at 10/01/2015 - 08:41

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Algernon

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