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Few years ago I did kind of the same panoramic inserts for 5x7 film holder. I used 8x10 sheets cut in 3 panoramic sheets (I was getting approx 3.3x7" each).
It worked good for me.
...

https://c7.staticflickr.com/2/1504/26672870382_0f99526c86_o.jpgKinderdijk by Vitaliy AK, on Flickr

I have a question regarding reciprocity, not sure how it works in case of star trails.
1. Star (projection) is moving across the film and each second (or a bit more) it is exposing new part of film,...

Fred, try Provia 100F.

I did few test shots with 4x5 Provia this summer, works good.

Aperture F/5.6, exposure depending on ambient light.
...

https://c7.staticflickr.com/9/8567/27801315414_ba1f0b57af_o.jpgSunrise, Azores, Sao Miguel by Vitaliy AK, on Flickr

Looks like front element have some separation.

https://farm1.staticflickr.com/612/21418030420_fffe7bbf28_b.jpgLagoa Do Fogo, Sao Miguel, Azores by Vitaliy AK

https://farm6.staticflickr.com/5660/21447329979_00153842c7_b.jpgSete Cidades, Sao...

Thank you.

It is a bit stupid story: after I shot this frame I was walking with camera and noticed that lens was not stopped down, so I assumed that I overexposed this sheet by 2 2/3 stops....

https://dl.dropboxusercontent.com/u/55245071/photo/linhof_technika_v_5x7_velvia_rodenstock.jpg
Hohenschwangau Castle
Linhof Technika V 5x7 with reduction back 4x5, Rodenstock Apo-Ronar 360mm....

https://farm8.staticflickr.com/7580/15919032367_b393a56c9b_b.jpg
Cabo Da Roca, Portugal. Westernmost extent of the Eurasian land mass.

Sinar 4x5, Schneider 180mm, Fuji Velvia RVP, 17 min...

https://dl.dropboxusercontent.com/u/55245071/photo/riga_sinar_4x5_velvia_RVP_50.jpg
Sunrise after rain in my hometown, Riga, Latvia.

Sinar Alpina, Rodenstock 180mm.
Velvia RVP 50, Tetenal E6.

Cambo 6x7 back, instead of 6x7 opening, did small vertical slit (approx 0,3mm) close to the film plane. Electric motor attached to advance the film during exposure.
As a result moving object is...

https://dl.dropboxusercontent.com/u/55245071/photo/sinar_cambo_film_advance.jpg
Sinar 4x5, Modified Cambo back.
Exposure trough tiny slit with film advance.

https://dl.dropboxusercontent.com/u/55245071/photo/Sinar_612_velvia_50_verona_thunderstorm.jpg
Sinar 4x5, Schneider Kreuznach 75mm.
Velvia RVP, 15min exp., Developed in Tetanal E6.
Cropped 2:1.

https://dl.dropboxusercontent.com/u/55245071/photo/sinar_4X5_velvia_rvp_50_schneider_75mm.jpg
Sinar 4x5, Schneider Kreuznach 75mm
Velvia RVP 50, Tetenal E6.

Thank you. No i'm not using any additional chemicals to correct balance. I do not have that level of knowledge what I'm doing to start correct WB with additional chemicals.
Also this shot is on...

Thank you. No, picture taken in Italy. Monte Baldo, next to Garda lake.

https://dl.dropboxusercontent.com/u/55245071/photo/sinar_4x5_75mm_velvia_rvp_50.jpg
Sinar 4x5, Schneider Kreuznach 75mm,
Expired Velvia RVP50 in Tetenal E6.

http://dl.dropboxusercontent.com/u/55245071/photo/monte_baldo_sinar_velvia_rvp_50.jpg
Sinar 4x5, Schneider 180mm
Velvia RVP50, Tetenal E6

Is that a Dallmeyer 3B without sleeve and hood? 380929266033 Sold for 405USD.
Or someone else did the same type rear group?

http://dl.dropboxusercontent.com/u/55245071/photo/sinar_pulligny_landscape_lens.jpg

http://dl.dropboxusercontent.com/u/55245071/photo/sinar_pulligny_landscape_lens_fp4%2B.jpg
Sinar Alpina,...

We came in around 9am when they just opened. It was completely empty. While I was setting up camera on some box (audio guides?), people started to come in.

http://dl.dropboxusercontent.com/u/55245071/photo/pantheon_rome_sinar_4x5_kodak_ektar.jpg
Pantheon, Rome.

Sinar Alpina, Schneider Kreuznach 75mm
Kodak Ektar 100

Steven, It looks like support for WHS.
I have 4d which looks the same. WHS is next to the flange (you can actually see on the photo cut for WHS) and rear group is screwed at the end of black...

Thank you.

http://dl.dropboxusercontent.com/u/55245071/photo/Kodak_E100G_Sinar_4x5_1110s.jpg
Sinar 4x5, Kodak E100G

https://dl.dropboxusercontent.com/u/55245071/photo/Sinar_4x5_Schneider_75_fireworks_Bremen.jpg
Fireworks. Ektachrome 64T 9x12.

Thank you everybody.

Corran, just wanted to try how 64T will look when cross processed. Plus I wanted to see picture and I didn't had E6 chemicals, only C41, so i gave a try :)
Lights were...

http://dl.dropboxusercontent.com/u/55245071/photo/Sinar_4x5_Schneider_75mm_Bremen_night.jpg
Sinar 4x5, Schneider 75mm
Kodak 64T, Cross processed in C41

http://dl.dropboxusercontent.com/u/55245071/photo/alley_kodak_aerochrome_iii_mpix_eu.jpg
Sinar Alpina, Aerochrome.
Orange filter, C41

May be this will help you.
http://nelsonfoto.com/SMF/index.php?topic=11483.0

http://dl.dropboxusercontent.com/u/55245071/photo/sinar_4x5_popeye_angulon_75.jpg
Sinar 4x5, Velvia RVP50

Thank you.

Regarding 1st image - I have no idea why it is like that. Could it be because of bad construction of camera (e.g. inner surface reflects too much light and should be more dark), or...

Couple shots from Venice.
http://dl.dropboxusercontent.com/u/55245071/photo/Sinar_pinhole_25mm_mpix_Venice.jpg

http://dl.dropboxusercontent.com/u/55245071/photo/Sinar_pinhole_25mm_mpix.jpg
4x5,...

https://dl.dropboxusercontent.com/u/55245071/photo/Sinar_4x5_Venice_Grand_Canal.jpg
Grand Canal
Sinar 4x5, SA 75mm 5,6
Ektachrome 100G

http://dl.dropbox.com/u/55245071/photo/Iriska_Sinar_Charles_Chevalier_Verres_Combines.jpg
Sinar F2, Adox 4x5

Yes. Flange, cup/shutter with aperture inserts and R&P*. Does it miss some glass elements? (If I'm not wrong this model had 2 groups only)

*Well, looks like that is enough to be worth nothing for...

Sorry, I was thinking I posted nr. 150975515357
Looks original, at least the same as on CCHarrison's posted picture and looks like the same as in Eastman catalog (1st on bottom line, missing...

There was one on e**y, just sold for 255GBP. Not complete, missing top ring with apertures + cup/shutter and without R&P. Looks like with dust and fungus, or may be even separation.
It is...

https://dl.dropbox.com/u/55245071/photo/Iriska_Dallmeyer_3B_Guarnerius_1729.jpg
With violin

Sinar 13x18, Dallmeyer 3B, Adox 100