Search found 673 matches

by ChrisLilley
Wed Apr 18, 2012 7:13 am
Forum: Beginners Macro
Topic: Help..which to choose...close up diopters or extension tubes
Replies: 17
Views: 9795

Harold Gough wrote: I have just been looking up information on Raynox supplementary lenses and have yet to confirm that they are achromats, althought is seems very probable that they are
The DCR 250 is a 3 elements in 2 groups achromat, and is listed as such in our close up lens FAQ.
by ChrisLilley
Wed Apr 18, 2012 6:58 am
Forum: Equipment Discussions
Topic: Rare Nikon Bellows Lens
Replies: 51
Views: 17262

Is the 75mm Rodagon D2x optimized for 2:1 in a forward or reversed direction? Reversed. Are you sure about that? Then wouldn't it be a 1/2x lens like the 95PN? Yes. Firstly that is what the data sheet says, the MTF is for β = -0.5 which means a magnification of 0.5x in the forward direction. S...
by ChrisLilley
Mon Apr 16, 2012 7:31 am
Forum: Equipment Discussions
Topic: Rare Nikon Bellows Lens
Replies: 51
Views: 17262

Peter De Smidt wrote: Is the 75mm Rodagon D2x optimized for 2:1 in a forward or reversed direction?
Reversed.
by ChrisLilley
Fri Apr 06, 2012 2:49 pm
Forum: Technical and Studio Photography -- Macro and Close-up
Topic: My first 10x stacking
Replies: 20
Views: 5021

Re: My first 10x stacking

shinchin wrote: My first 10x stacking without cropping. A lot vignetting and dark corners probably due to the zoom len used.
Yes, but the skillful composition turns that into an advantage for this shot.
by ChrisLilley
Fri Apr 06, 2012 2:39 pm
Forum: Beginners Micro
Topic: Why is this not fitting?
Replies: 8
Views: 3300

Yes, basically correct. Thay are different mounts: M42 is a very old one that used to be used in the 1960s before brands all developed their own (like the Nikon mount). You want a M42 female to Nikon male adapter Note: I'm not a Nikon user. So if someone who is could just doublecheck this informati...
by ChrisLilley
Tue Apr 03, 2012 3:36 pm
Forum: Macro and Micro Technique and Technical Discussions
Topic: Infinite objectives , tube lenses and questions ...
Replies: 25
Views: 6847

: Nikon CF 10X / 0.30 > 36mm ext. tube > Tokina 90mm Macro focused at infinity > 10cm bellows extension, exposure time 1.3 sec. , ISO 100. What is the 10cm belows extension for? The tube lens should be used at infinity, and extension will not allow it to reach infinity. Despite your anti-vibration ...
by ChrisLilley
Mon Apr 02, 2012 8:45 am
Forum: Equipment Discussions
Topic: Sharpest lenses for 0.3x...1.2x??
Replies: 81
Views: 34647

BUT considering the 2 lenses have a totally different construction & optical layout, it is difficult to tell wether the improvement comes from the coating or the completely different design... :?: I suspect the design at least as much as the coatings. Tamron 52B 90mm f/2.5 is 8 elements in 6 groups...
by ChrisLilley
Wed Mar 28, 2012 10:32 am
Forum: Equipment Discussions
Topic: Infared IR Conversion Considerations and Options
Replies: 21
Views: 5734

Re: Colour Infared IR

I've secured a Nikon D50 which has been converted to colour IR. It seemed like an interesting avenue to explore. It's only a 6.1mp DSLR (10,585 actuations) and I only have one MF Nikon lens that would be compatible, the Micro Nikkor 55/3.5. Be careful if your Micro-Nikkor is pre-AI. The D50 has a m...
by ChrisLilley
Wed Mar 28, 2012 10:25 am
Forum: Equipment Discussions
Topic: Infared IR Conversion Considerations and Options
Replies: 21
Views: 5734

If you are interested in "pure" IR images, then you need to mount an additional IR-pass, visible-cut filter on the lens and frame and focus in live view. Although, the D50 does not have live view. http://www.dpreview.com/reviews/nikond50 So for pure IR images you need to focus with visible light, m...
by ChrisLilley
Tue Mar 27, 2012 3:42 pm
Forum: Equipment Discussions
Topic: Sharpest lenses for 0.3x...1.2x??
Replies: 81
Views: 34647

One thing to note, the definition of APO used for microscope objectives may not be the same definition used by Rodenstock and Schneider for photography lenses. This is unfortunately common for photographic lenses (Sigma call a lot of their lenses 'apo' which seems to mean 'uses some low dispersion ...
by ChrisLilley
Mon Mar 26, 2012 12:39 pm
Forum: Equipment Discussions
Topic: Recommendations on flash for stacking?
Replies: 39
Views: 16754

DQE wrote:Sounds like we're approaching a conclusion that one needs to dump one's Canon stuff in favor of an all-Nikon system!
I assume this is humour but just in case, way to little data to draw any such sweeping conclusion.
by ChrisLilley
Sun Mar 25, 2012 3:51 pm
Forum: Equipment Discussions
Topic: Nikon D5000 custom white balance for flash?
Replies: 2
Views: 1225

Menu > White Balance > Preset manual > Measure. Point at white or grey card.

See pp. 99-100 in the manual.
by ChrisLilley
Fri Mar 23, 2012 12:54 pm
Forum: Equipment Discussions
Topic: Recommendations on flash for stacking?
Replies: 39
Views: 16754

What's interesting in the data I'm showing here is that the overall exposure is consistent even though the color balance shifts. In one frame the RGB values are [189,188,186] while in another frame they are [188,190,189]. This is averaged over the same 51x51 area in both images. It's the change in ...
by ChrisLilley
Thu Mar 15, 2012 5:19 am
Forum: Technical and Studio Photography -- Macro and Close-up
Topic: Blowfly at 5X using Nikon CFI BE 10X (stereo added)
Replies: 13
Views: 24641

johan wrote:You're very kind to do this, thank you Rik. I'm sold, I tried to order it through Amazon but they won't ship to the UK. I'll see if I can find a source.
OpticsPlanet international shipping options
by ChrisLilley
Tue Mar 13, 2012 10:06 pm
Forum: Equipment Discussions
Topic: Cree Truewhite LEDs
Replies: 1
Views: 876

I see they sell evaluation kits at USD 199 for two lamps. It is not clear if you can choose the colour temperature of the lamps in the kit, though. http://www.cree.com/ledmodules/modules.asp Single unmounted modules seem to go for USD 83.73 in quantities of less than 10. http://search.digikey.com/us...