View Full Version : Doctor lens/LensHoods/Groundglass Protector/Sratched lens

kev walker
2-Oct-1997, 11:41
I am considering purchasing a 240mm f9 Doctor Germinar lens (I am told the optical quality is as good as the Rodenstock equivalent at half the cost)I would appreciate any comments from readers familiar with this optic.

Are lenshoods a good idea to use with large-format lenses...I never seem to hear or see large format photographers using them!And if so,what are good brands to look out for?

How practical are Groundglass Protectors;I carry my 5x4 in a billingham,would it still make good sense to invest in one or are they just a gadget for me to part with my money.

I recently dropped my 210mm Schneider during a shoot.The front element has a dee p mark.I am told that because it is

on the front element I should not worry,and because Schneider lenses are multi c oated.Is this true? I have used the lens in question since without any differenc e in image quality.

QT Luong
15-Oct-1997, 21:08
Lenshoods: in the lf world people tend to use compendium shades instead. they consist of a belows and offer more adjustment possibilities than the rigid hoods. calumet makes several models, but you have to find a way to attach them to your camera. if you are lucky the manufacturer of your camera has a fitted compendium shade.

i find the ground glass protector useful. i throw my camera in a backpack. the only part to worry about is the ground glass.

Brian Ellis
2-Dec-1997, 14:17
The Lee filter company makes an adjustable, bellows-like lens shade that works w ell and is available from B&H for about $110. There are two versions, one of whi ch is designed to accept a single filter and the other of which is designed to a ccept multiple filters (primarily for color photographers). Obviously, you don't have to attach a filter and can use the shade strictly as a lens shade. It atta ches to the front of the lens by use of an adapter ring. You need one adapter ri ng for each different front lens size that you use (e.g. 67mm, 72mm, 77mm, etc.) or you can buy one adapter ring in the largest size lens that you own and then attach your other lenses by using step-up rings. This saves a little money becau se the adapter rings are about $30 each, whereas step-up rings usually run only about $5 each.

I like using a ground glass protector. I don't think it's a gimmick. If the manu factuer of your camera doesn't make a protector designed for your camera, or if it costs too much money (e.g. Wisner makes a very attractive ground glass protec tor for Wisner cameras but it costs $60 or so) there are at least two sources fo r "generic" protectors. Calumet sells one for about $15. It does the job but it is made out of some sort of fairly hideous looking plastic. Canham makes a plexi glass protector that I find more attractive than the Calumet one and it sells fo r about $30. It is available from Del's Cameras in Santa Barbara, Cal. and perha ps other places as well.

Peter Hughes
6-Dec-1997, 13:15
In the real, real world, compendum lenshoods are not always practical. And besid es, they're expensive. I simply use the dark slide to 'gobo' the lens, i.e., sha de the lens from either direct sunlight or skylight. I made a groundglass protector for my 8x10 Deardorff after breaking the groundgl ass just before an important shoot. Find a plexiglass scrap and glue 4 pieces of Velcro to the corners. Then do the same to the camera back. I would also sugges t carrying a spare groundglass, just in case. In general, I find that I have to make a lot of stuff for large format. Don't gi ve the pricey gadget people your money if you don't have to. Sometimes spit and chewing gum is best.

Arne Croell
10-Dec-1997, 16:03
The Apo-Germinars are as good as the Apo-Ronars; I have tested the 300mm Apo-Ger minar and Apo-Ronar side by side, and the Apo-Germinar was at least as good. Her e in Germany, it was not half the price, though, about 20% less than the Rodenst ock. Try to get the newer version Apo-Germinar with a little brass spacer ring c alled the "trim ring". It is mounted between shutter and front cell. Without the ring, the lens correction is optimized for magnifications between 1:5 and 5:1, with the ring for all the other ones , e.g. for larger distances.

Jim Blecha
31-Dec-1997, 00:41
On lens shades, I agree with Peter Hughes. Even though I own one for my Cambo 4X 5, I most often use pieces of black matte board attached with to the lensboard w ith sticky velcro. Bend the board outward from the velcro on the corner of a tab le before using the first time and size it as needed. The price is right and bot h hands are free! Just watch out for vignetting with wide angle lenses.